CN111722408A - Large-angle deflection receiving and transmitting integrated optical fiber collimator - Google Patents
Large-angle deflection receiving and transmitting integrated optical fiber collimator Download PDFInfo
- Publication number
- CN111722408A CN111722408A CN202010763333.5A CN202010763333A CN111722408A CN 111722408 A CN111722408 A CN 111722408A CN 202010763333 A CN202010763333 A CN 202010763333A CN 111722408 A CN111722408 A CN 111722408A
- Authority
- CN
- China
- Prior art keywords
- prism
- angle
- light
- central circular
- deflection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 230000000903 blocking effect Effects 0.000 claims abstract description 21
- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims description 52
- 230000008859 change Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 230000031700 light absorption Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000010408 film Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 5
- 239000012788 optical film Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0875—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements
- G02B26/0883—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements the refracting element being a prism
- G02B26/0891—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements the refracting element being a prism forming an optical wedge
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The large-angle deflection transceiving integrated optical fiber collimator comprises a camera, a central light blocking mirror, a dichroic mirror, a collimating lens and a rotating dichroic mirror, wherein laser output by the optical fiber is transmitted to the dichroic mirror, the laser reflected by the dichroic mirror is output to the collimating lens to be collimated into parallel light and then is transmitted to a target through the rotating dichroic mirror, target scattering/reflected light from the target is transmitted reversely along an original optical path as target detection light, the target scattering/reflected light is incident to the dichroic mirror after being focused by the rotating dichroic mirror, and is output to the central light blocking mirror through the dichroic mirror, the light incident to the center of the central light blocking mirror is blocked by the central light blocking mirror, the light incident to the edge of the central light blocking mirror is transmitted and then enters the camera, and the camera is positioned on a focal plane of transmitted light to realize imaging detection of the target. The invention can realize the functions of fiber laser emission, large-angle deflection, target imaging and the like, and has wide application prospect in the field of laser long-distance transmission.
Description
Technical Field
The invention relates to the technical field of high-power fiber laser devices, in particular to a large-angle deflection transceiving integrated fiber collimator.
Background
The existing optical fiber laser collimator is mainly used for collimating and expanding laser output by optical fibers and has a single function. In the field of laser long-distance transmission such as space optical communication, laser energy transmission, laser obstacle clearance and the like, multiple functions such as collimation emission, large-angle deflection, target imaging and the like of light beams need to be realized at the same time. At present, the technical scheme of a universal frame and a telescope is mainly adopted, the system is complex, the volume and the weight are large, and the application of the system is limited. More devices need to be carried at the same time, so that the volume and the weight of the whole system are greatly increased, and the application of the system is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a large-angle deflection transceiving integrated optical fiber collimator. The invention can realize the functions of collimating emission, large-angle deflection, target imaging and the like of the fiber laser without obviously increasing the volume and the weight of the system, and has wide application prospect in the field of laser long-distance transmission.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
a large-angle deflection receiving-transmitting integrated optical fiber collimator comprises a camera, a central light blocking mirror, a dichroic mirror, a collimating lens and a rotating dichroic prism, wherein the dichroic mirror, the collimating lens and the dichroic prism are sequentially arranged on a laser emission light path, optical fiber output laser is transmitted to the dichroic mirror, laser reflected by the dichroic mirror is output to the collimating lens, collimated into parallel light and then transmitted to a target as emission light through the rotating dichroic mirror, target scattering/reflection light from the target is transmitted along an original light path in a reverse direction as target detection light, the target scattering/reflection light is incident to the collimating lens after being focused by the rotating dichroic mirror and then is output to the central light blocking mirror through the dichroic mirror, light incident to the central part of the central light blocking mirror is blocked by the central light blocking mirror, light incident to the edge of the central light blocking mirror is transmitted and then enters the camera, and the camera is positioned on a focal plane of the transmission, and imaging detection of the target is realized.
The central axes of the camera, the central light-blocking mirror, the dichroic mirror, the collimating lens and the rotating biprism are superposed.
In the invention, the rotating double prism comprises a 1# prism, a 2# prism, a 1# prism driving mechanism and a 2# prism driving mechanism, wherein the 1# prism and the 2# prism are wedge prisms, the 1# prism and the 2# prism are respectively arranged on the 1# prism driving mechanism and the 2# prism driving mechanism, the 1# prism and the 2# prism can rotate around a rotating shaft under the driving of the corresponding prism driving mechanisms, and the beam deflection of the emitted light incident on the rotating double prism is realized, wherein the rotating shaft is the optical axis of the emitted light incident on the rotating double prism. The prism driving mechanism 1 and the prism driving mechanism 2 have the same structure and respectively comprise a torque motor, a transmission mechanism and a supporting mechanism, the prism is arranged on the supporting mechanism, the torque motor is connected with the transmission mechanism, the transmission mechanism is connected with the prism on the supporting mechanism, and the torque motor drives the prism to rotate through the transmission mechanism; the prism driving mechanism is also provided with an angular displacement sensor, a speed sensor and an acceleration sensor which are respectively used for detecting the angular displacement, the speed and the acceleration of the prism in the rotating process.
Preferably, the 1# prism and the 2# prism are both right-angle wedge prisms, and the right-angle planes of the 1# prism and the 2# prism are close to each other as much as possible. And defining the diameter between the thinnest end and the thickest end of the circle center of the right-angle surface of the right-angle wedge prism as a marking line of the right-angle wedge prism.
Preferably, the 1# prism and the 2# prism of the invention are both composed of a central circular prism and an edge annular prism, the diameter of the central circular prism is equal to the aperture size of a central circular hole of the edge annular prism, the central circular prism is arranged in the central circular hole of the edge annular prism, wherein the central circular prism is used for laser emission, and the edge annular prism is used for target detection.
Because the central circular prism is required to be capable of resisting the power of emitted laser, the central circular prism is plated with an antireflection film of an emitted light wave band, and the prism wedge angle of the central circular prism is calculated according to the following formula:
where γ is the maximum deflection angle of the emitted light required, determined by the user from the actual use case, as a known term; n is the refractive index of the central circular prism; alpha is the central circular prism wedge angle.
And the edge annular prism is plated with a probe light wave band antireflection film. Furthermore, the edge ring prism has two preferable structural design modes, one is designed according to a refractive index matching mode, the edge ring prism selects a base material different from that of the central circular prism, so that the refractive index of the edge ring prism at a target detection light wavelength/section is equal to that of the central circular prism at an emission light wavelength/wavelength section, and the wedge angle of the edge ring prism is equal to that of the central circular prism, so that the emission light and the target detection light have the same optical axis. The second is a wedge angle matching mode, in which the edge ring prism selects the same base material as the central circular prism, and the optical axis angle difference between the emitted light and the target detection light is minimized by designing a prism wedge angle different from that of the central circular prism, the method is as follows:
the two central circular prisms are used as wedge prisms, the included angle between the marking lines of the two central circular prisms is defined as a marking line included angle, the two central circular prisms are rotated, the included angle of the marking lines of the two central circular prisms is changed, and a change curve A of the emission light deflection angle along with the included angles of different marking lines is obtained;
determining the refractive index of a substrate material of the edge annular prism at the target detection light wavelength, acquiring a change curve B of the target detection light deflection angle along with different prism wedge angles of the edge annular prism under the refractive index at the target detection light wavelength, continuously adjusting the size of the prism wedge angle of the edge annular prism until the obtained variance between the change curve B and the change curve A is minimum, and taking the corresponding prism wedge angle as the finally required prism wedge angle of the edge annular prism.
The collimating lens can be realized by adopting a single lens or a lens group, can resist the power of emitted laser, plates an antireflection film with two wave bands of emitted light and detected light, and preferentially considers the high antireflection of the wave band of the emitted light. The lens or lens group is designed to ensure that the spot size of the emitted light at the collimating lens is smaller than the diameter of the central circular prism. The lens or the lens group needs to consider the beam quality of the emitted light and the imaging quality index of the detection light at the same time during optical design.
In the invention, one surface of the dichroic mirror facing to the optical fiber end cap is plated with an optical film with high reflection of emitted light wavelength/waveband and high transmission of detected light, and the high reflection of the emitted light is preferably considered; the other side is plated with a high-transmittance film of the detection light. The lens substrate and the film can resist the emitted light power, and the size of the lens meets the clear aperture required by the detection light.
The central light blocking lens is a band-pass filter of target detection light, only light of a target detection light wave band can pass through in the imaging wave band response range of the camera, the central circular area of the central light blocking lens is blackened by light absorption materials to prevent the target detection light from transmitting, and the diameter of the blackened central circular area is slightly larger than that of an imaging area of the target detection light transmitted by the central circular prism on the central light blocking lens.
The camera provided by the invention adopts a commercial camera, can respond to a detection light wave band, and parameters such as frame frequency, pixel size and the like can be selected according to the actual requirements of the system.
The 1# prism and the 2# prism are driven by the prism driving mechanisms respectively corresponding to the 1# prism and rotate by corresponding angles, namely the rotation angle theta of the 1# prism1And the rotation angle theta of the 2# prism2，Then the emitted light is through twoThe deflection angle of the outgoing beam after the prism is ω, the azimuth angle.
The large-angle deflection receiving and transmitting integrated optical fiber collimator provided by the invention can be arranged into a collimator array according to a square matrix or other modes, and realizes splicing large-field detection and simultaneous emission of array beams.
The invention has the following beneficial effects:
the invention provides a scheme of a high-power large-angle deflection transceiving integrated optical fiber collimator based on a rotating double prism, which solves the problems of light beam emission, large-angle deflection, target imaging and the like of the high-power optical fiber collimator under the conditions of no universal frame mechanism and small volume and weight.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic structural view of example 2;
FIG. 3 is a front view of a wedge prism constituting a biprism;
FIG. 4 is a cross-sectional view of a wedge prism resulting from index matching;
FIG. 5 is a cross-sectional view of a wedge prism resulting from an angle-matching approach;
FIG. 6 is a schematic view of a central light-blocking lens structure;
FIG. 7 is a schematic diagram showing the relationship between the prism rotation angle and the light transmission.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present embodiment provides a large-angle deflection transceiving integrated optical fiber collimator, including a camera 6, a central light-blocking mirror 5, a dichroic mirror 2, a collimating lens 3, and a rotating dichroic mirror 4, wherein a light path of laser light is sequentially provided with the dichroic mirror 2, the collimating lens 3, and the dichroic mirror 4, a transmitting laser light emitted from an optical fiber end cap 1 is incident to the dichroic mirror 2, the laser light reflected by the dichroic mirror 2 is output to the collimating lens 3 to be collimated into parallel light, and then is emitted to a target as a transmitting light through the rotating dichroic mirror 4, a target scattered/reflected light from the target is transmitted backward along an original light path as a target detection light, the target scattered/reflected light is incident to the collimating lens 3 through the rotating dichroic mirror 4 and then is incident to the dichroic mirror 2, and is output to the central light-blocking mirror 5 through the dichroic mirror 2, and the light incident to the central portion of the central, the light incident to the edge of the central light-blocking mirror 5 is transmitted and then enters the camera 6, and the camera 6 is positioned on the focal plane of the transmitted light, so that the imaging detection of the target is realized. As shown in fig. 1, the central axes of the camera 6, the central light-blocking mirror 5, the dichroic mirror 2, the collimator lens 3, and the rotating dichroic mirror 4 coincide with each other.
Referring to fig. 1, the rotating biprism includes a # 1 prism 7, a # 2 prism 8, a # 1 prism driving mechanism 9 and a # 2 prism driving mechanism 10, the # 1 prism 7 and the # 2 prism 8 are wedge prisms, the # 1 prism 7 and the # 2 prism 8 are respectively mounted on the # 1 prism driving mechanism 9 and the # 2 prism driving mechanism 10, and the # 1 prism 7 and the # 2 prism 8 can rotate around a rotating shaft under the driving of the corresponding prism driving mechanisms to realize beam deflection of emitted light incident on the rotating biprism, wherein the rotating shaft is an optical axis of the emitted light incident on the rotating biprism.
The prism driving mechanism 1 and the prism driving mechanism 2 have the same structure, each prism driving mechanism comprises a torque motor, a transmission mechanism and a supporting mechanism, the prisms are arranged on the supporting mechanisms, the torque motors are connected with the transmission mechanisms, the transmission mechanisms are connected with the prisms on the supporting mechanisms, and the torque motors drive the prisms to rotate through the transmission mechanisms; the prism driving mechanism mainly realizes the rotation of the two prisms at any angle along the direction of the optical axis, and the mechanism is widely applied in the field of high-precision rotation application and only needs to be designed according to the specific size of the prism.
In this embodiment, the 1# prism 7 and the 2# prism 8 are both right-angle wedge prisms, and the right-angle planes of the 1# prism 7 and the 2# prism 8 are as close as possible. And defining the diameter between the thinnest end and the thickest end of the circle center of the right-angle surface of the right-angle wedge prism as a marking line of the right-angle wedge prism.
Because the emission laser and the detection target light are different wavelengths/wave band light, the refractive index of the prism made of the same material to the two lights is different, so that an included angle exists between the optical axes of the emission light and the detection light, and finally, the target position pointed by the emission laser and the target position detected are different. Therefore, the invention provides a combined prism, the prism wedge angle or the refractive index of the central part and the edge part of the prism is different, the central part is used for laser emission, the edge part is used for target detection, and real-time coaxial of the emitted light and the detected light can be effectively realized by reasonably selecting the refractive index, the wedge angle and the detection wavelength. The 1# prism 7 and the 2# prism 8 in the present invention are both combined prisms composed of two parts, namely, a central circular prism 12 and an edge ring prism 13, as shown in fig. 3. The diameter of the central circular prism 12 is equal to the aperture size of the central circular hole of the edge annular prism 13, and both prisms are right-angle prisms. The central circular prism 12 is arranged in the central circular hole of the edge annular prism 13, and the right-angle surfaces of the two prisms are ensured to be positioned on the same plane. The diameter of the thinnest end and the thickest end of the circle center of the right-angle surface of the prism is defined as a marking line of the prism, and the marking lines of the two prisms are overlapped. Wherein a central circular prism 12 is used for laser emission and an edge ring prism 13 is used for object detection. The central circular prism can resist the power of emitted laser, the central circular prism is plated with an antireflection film of an emitted light wave band, and the prism wedge angle of the central circular prism is calculated according to the following formula:
where γ is the maximum deflection angle of the emitted light required, determined by the user from the actual use case, as a known term; n is the refractive index of the central circular prism; alpha is the central circular prism wedge angle.
The edge ring prism 13 is plated with a reflection reducing coating of a detection light wave band. Further, the present invention provides two preferable structural design modes of the edge ring prism 13, one is designed according to the index matching mode, the edge ring prism selects a base material different from that of the central circular prism so that the refractive index of the edge ring prism at the target detection light wavelength/wavelength section is equal to that of the central circular prism at the emission light wavelength/wavelength section, and the wedge angle of the edge ring prism is equal to that of the central circular prism so that the emission light and the target detection light have the same optical axis. As shown in fig. 4, a cross-sectional view of a wedge prism obtained by the index matching method.
The second configuration of the edge ring prism 13 is a wedge angle matching in which the base material of the edge ring prism is the same as that of the central circular prism, and the difference in the optical axis angle between the emission beam and the detection beam is minimized by designing the wedge angle different from that of the central circular prism. The specific design method comprises the following steps:
(1) the two central circular prisms are used as wedge prisms, the included angle between the marking lines of the two central circular prisms is defined as a marking line included angle, the two central circular prisms are rotated, the included angle of the marking lines of the two central circular prisms is changed, and a change curve A of the outgoing light deflection angle along with the included angles of different marking lines is obtained;
(2) determining the refractive index of a substrate material of the edge annular prism at the target detection light wavelength, acquiring a change curve B of the target detection light deflection angle along with different prism wedge angles of the edge annular prism under the refractive index at the target detection light wavelength, continuously adjusting the size of the prism wedge angle of the edge annular prism until the obtained variance between the change curve B and the change curve A is minimum, and taking the corresponding prism wedge angle at the moment as the finally required prism wedge angle of the edge annular prism. As shown in fig. 5, fig. 5 is a cross-sectional view of a wedge prism obtained by the angle matching method.
The first way allows for perfect coincidence of the detection and emission light axes in all cases. In the second method, the optical axis deviation between the detection light and the emission light can be greatly reduced as compared with the case of using a single prism.
The collimating lens 3 can be realized by a single lens or a lens group, can resist the power of emitted laser, is plated with an antireflection film with two wave bands of emitted light and detected light, and preferentially considers the high antireflection of the wave band of the emitted light. The lens or lens group is designed to ensure that the spot size of the emitted light at the collimating lens is smaller than the diameter of the central circular prism. The lens or the lens group needs to consider the beam quality of the emitted light and the imaging quality index of the detection light at the same time during optical design.
The dichroic mirror 2 is plated with an optical film which has high reflection of emitted light wavelength/waveband and high transmission of detected light towards one surface of the optical fiber end cap, and the high reflection of the emitted light is preferably considered; the other side is plated with a probe light anti-reflection film. The lens substrate and the film can resist the emitted light power, and the size of the lens meets the clear aperture required by the detection light.
Referring to fig. 6, the central light-blocking lens 5 is a bandpass filter for detecting light, and only the detection light band can pass through within the imaging band response range of the camera, the central circular area 14 of the central light-blocking lens 5 is blackened by a light-absorbing material to prevent the detection light from passing through, and the diameter of the blackened area is slightly larger than the imaging area of the central circular area of the prism on the central light-blocking lens through the detection light.
The camera 6 is a commercial camera and can respond to a detection light wave band, and parameters such as frame frequency, pixel size and the like can be selected according to the actual requirements of the system.
Referring to fig. 2, the present embodiment provides a large-angle deflection transceiving integrated optical fiber collimator, including a camera 6, a central light-blocking mirror 5, a dichroic mirror 2, a collimating lens 3, and a rotating dichroic mirror 4, wherein a light path of laser light is sequentially provided with the dichroic mirror 2, the collimating lens 3, and the dichroic mirror 4, a transmitting laser light emitted from an optical fiber end cap 1 is incident to the dichroic mirror 2, the laser light reflected by the dichroic mirror 2 is output to the collimating lens 3 to be collimated into parallel light, and then is emitted to a target as a transmitting light through the rotating dichroic mirror 4, a target scattered/reflected light from the target is transmitted backward along an original light path as a target detection light, the target scattered/reflected light is incident to the collimating lens 3 through the rotating dichroic mirror 4 and then is incident to the dichroic mirror 2, and is output to the central light-blocking mirror 5 through the dichroic mirror 2, the light incident to the central portion of the central light, the light incident to the edge of the central light-blocking mirror 5 is transmitted out and then enters the camera 6, and the camera 6 is positioned on the focal plane of the transmitted light, so that the imaging detection of the target is realized. As shown in fig. 2, the central axes of the camera 6, the central light-blocking mirror 5, the dichroic mirror 2, the collimator lens 3, and the rotating dichroic mirror 4 coincide with each other.
The difference between the embodiment 2 and the embodiment 1 is that the rotating biprism in the embodiment 2 further includes a controller 11, the displacement sensor, the speed sensor, the acceleration sensor and each torque motor are all connected to the controller 11, the displacement sensor, the speed sensor and the acceleration sensor transmit collected signals to the controller, and the controller controls the operation of each torque motor. The controller can be designed more optimally by those skilled in the art, for example, the controller can also be used for calculating the correspondence between the rotation angles of the 1# prism and the 2# prism and the direction of the emitted light beam in real time, and generating a corresponding control signal to be sent to the prism driving mechanism. The controller can be developed by data processing chips such as DSP, FPGA and the like, and can also be a commercial electronic computer. The controller can also receive target position information sent by an external system, can also send the pointing information of the current system light beam to the external system, and can send a prism rotation control signal to the prism driving mechanism.
For the large-angle deflection transceiving integrated optical fiber collimator provided by the above embodiment, if the current rotation angle of two prisms in a double prism is known, the azimuth angle and the deflection angle of an outgoing light beam passing through the double prism can be solved, which is called as forward solution, and the method is as follows:
referring to fig. 7, the rectangular planes of the 1# prism 7 and the 2# prism 8 are attached, the centers of circles are coincident, a rectangular coordinate system is established with the center of circle as an origin, the rectangular plane of the prisms is an XOY plane, the X axis is the horizontal direction, the Y axis is the vertical direction, and emitted light enters along the positive direction of the Z axis; an included angle between an emergent beam passing through the double prisms and the Z axis is defined as a deflection angle of the emergent beam, and an included angle omega between a plane formed by the emergent beam and the Z axis and an XOZ plane is defined as an azimuth angle of the emergent beam; the included angle between the marking line 15 of the 1# prism and the positive direction of the X axis is defined as the rotation angle of the 1# prism, the included angle between the marking line 16 of the 2# prism and the positive direction of the X axis is defined as the rotation angle of the 2# prism, the rotation angle range of each prism is-pi, the anticlockwise direction is positive, and the clockwise direction is negative;
let the rotation angle of the current 1# prism be theta1The rotation angle of the 2# prism is theta2，θ1And theta2As known, the deflection angle and the azimuth angle ω of the outgoing beam after the outgoing beam passes through the double prism are calculated by the following formulas:
wherein α is the wedge angle of the central circular prism, n is the refractive index of the central circular prism, γ is the maximum deflection angle of the required emitted light,
is an intermediate variable.
For the large-angle deflection transceiving integrated optical fiber collimator provided in the above embodiment, if the deflection angle and the azimuth angle ω of the outgoing light beam to be obtained after the outgoing light passes through the double prism are known, the rotation angle, called as a reverse solution, of the double prism, which needs to be rotated in the double prism, may be obtained by the following method:
referring to fig. 7, the rectangular planes of the 1# prism 7 and the 2# prism 8 are attached, the centers of circles are coincident, a rectangular coordinate system is established with the center of circle as an origin, the rectangular plane of the prisms is an XOY plane, the X axis is the horizontal direction, the Y axis is the vertical direction, and emitted light enters along the positive direction of the Z axis; an included angle between an emergent beam passing through the double prisms and the Z axis is defined as a deflection angle of the emergent beam, and an included angle omega between a plane formed by the emergent beam and the Z axis and an XOZ plane is defined as an azimuth angle of the emergent beam; the included angle between the marking line 15 of the 1# prism and the positive direction of the X axis is defined as the rotation angle of the 1# prism, the included angle between the marking line 16 of the 2# prism and the positive direction of the X axis is defined as the rotation angle of the 2# prism, the rotation angle range of each prism is-pi, the anticlockwise direction is positive, and the clockwise direction is negative;
setting the emergent light beam passing through the double prisms to meet the requirement that the deflection angle and the azimuth angle are omega, and solving the rotation angle theta of the 1# prism by adopting the following formula1And the rotation angle theta of the 2# prism2：
Wherein alpha is the wedge angle of the central circular prism, n is the refractive index of the central circular prism, and eta, beta and H are intermediate variables.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (13)
1. The large-angle deflection transceiving integrated optical fiber collimator is characterized in that: the system comprises a camera, a central light blocking mirror, a dichroic mirror, a collimating lens and a rotating dichroic mirror, wherein the dichroic mirror, the collimating lens and the dichroic mirror are sequentially arranged on a laser emission light path, optical fiber output laser is transmitted to the dichroic mirror, the laser reflected by the dichroic mirror is output to the collimating lens to be collimated into parallel light and then transmitted to a target through the rotating dichroic mirror, target scattering/reflected light from the target is transmitted along an original light path in a reverse direction as target detection light, the target scattering/reflected light is incident to the collimating lens through the rotating dichroic mirror to be focused and then incident to the dichroic mirror, the dichroic mirror is output to the central light blocking mirror through the dichroic mirror, light incident to the central part of the central light blocking mirror is blocked by the central light blocking mirror, light incident to the edge of the central light blocking mirror is transmitted and then enters the camera, and the camera is positioned on a focal plane of transmitted light.
2. The large angle deflection transceiving integrated fiber collimator of claim 1, wherein: the central axes of the central light-blocking mirror, the dichroic mirror, the collimating lens and the rotating biprism are superposed.
3. The large angle deflection transceiving integrated fiber collimator of claim 1, wherein: the rotating double prism comprises a 1# prism, a 2# prism, a 1# prism driving mechanism and a 2# prism driving mechanism, wherein the 1# prism and the 2# prism are wedge prisms, the 1# prism and the 2# prism are respectively arranged on the 1# prism driving mechanism and the 2# prism driving mechanism, the 1# prism and the 2# prism can rotate around a rotating shaft under the driving of the corresponding prism driving mechanisms, and the light beam deflection of the emitted light incident on the rotating double prism is realized, wherein the rotating shaft is the optical axis of the emitted light incident on the rotating double prism.
4. The large angle deflection transceiving integrated fiber collimator of claim 3, wherein: the prism driving mechanism 1 and the prism driving mechanism 2 have the same structure and respectively comprise a torque motor, a transmission mechanism and a supporting mechanism, the prism is arranged on the supporting mechanism, the torque motor is connected with the transmission mechanism, the transmission mechanism is connected with the prism on the supporting mechanism, and the torque motor drives the prism to rotate through the transmission mechanism; the prism driving mechanism is also provided with an angular displacement sensor, a speed sensor and an acceleration sensor which are respectively used for detecting the angular displacement, the speed and the acceleration of the prism in the rotating process.
5. The large angle deflection transceiving integrated fiber collimator of claim 4, wherein: the rotating biprism further comprises a controller, the displacement sensor, the speed sensor, the acceleration sensor and each torque motor are all connected with the controller, the displacement sensor, the speed sensor and the acceleration sensor transmit collected signals to the controller, and the controller controls the work of each torque motor.
6. The large angle deflection transceiver optical fiber collimator of claim 3, 4 or 5, wherein: the 1# prism and the 2# prism are both right-angle wedge prisms, and the right-angle planes of the 1# prism and the 2# prism are close to each other as much as possible.
7. The large angle deflection transceiving integrated fiber collimator of claim 6, wherein: the 1# prism and the 2# prism are both composed of a central circular prism and an edge annular prism, the diameter of the central circular prism is equal to the aperture size of a central circular hole of the edge annular prism, the central circular prism is arranged in the central circular hole of the edge annular prism, the central circular prism is used for laser emission, and the edge annular prism is used for target detection.
8. The large angle deflection transceiving integrated fiber collimator of claim 7, wherein: the central circular prism is plated with an antireflection film of a transmitting light wave band, and the prism wedge angle of the central circular prism is calculated according to the following formula:
where γ is the maximum deflection angle of the emitted light required, determined by the user from the actual use case, as a known term; n is the refractive index of the central circular prism; alpha is the central circular prism wedge angle.
9. The large angle deflection transceiving integrated fiber collimator of claim 7, wherein: the edge annular prism is plated with a detection light wave band antireflection film, the edge annular prism selects a base material different from that of the central circular prism, so that the refractive index of the edge annular prism at a target detection light wavelength/wave band is equal to that of the central circular prism at an emission light wavelength/wave band, and the wedge angle of the edge annular prism is equal to that of the central circular prism, so that the emission light and the target detection light have the same optical axis.
10. The large angle deflection transceiving integrated fiber collimator of claim 7, wherein: the method comprises the following steps that an antireflection film of a detection light wave band is plated on an edge annular prism, the edge annular prism is made of the same base material as that of a central circular prism, and the optical axis angle difference between emitted light and target detection light is minimized by designing a prism wedge angle different from that of the central circular prism:
the two central circular prisms are used as wedge prisms, a marking line passing through the thinnest end and the thickest end of the circle center of a right-angle surface of each right-angle wedge prism is defined as a diameter of the right-angle wedge prism, an included angle between the marking lines of the two central circular prisms is defined as a marking line included angle, the two central circular prisms are rotated, the included angles of the marking lines of the two central circular prisms are changed, and a change curve A of a transmission light deflection angle along with different marking line included angles is obtained;
determining the refractive index of a substrate material of the edge annular prism at the target detection light wavelength, acquiring a change curve B of the target detection light deflection angle along with different prism wedge angles of the edge annular prism under the refractive index at the target detection light wavelength, continuously adjusting the size of the prism wedge angle of the edge annular prism until the obtained variance between the change curve B and the change curve A is minimum, and taking the corresponding prism wedge angle as the finally required prism wedge angle of the edge annular prism.
11. The large angle deflection transceiving integrated fiber collimator of claim 1, wherein: the central light blocking lens is a band-pass filter of target detection light, light of a target detection light wave band can only pass through within the imaging wave band response range of the camera, the central circular area of the central light blocking lens is blackened by light absorption materials to prevent the target detection light from transmitting, and the diameter of the blackened central circular area is slightly larger than that of an imaging area of the target detection light transmitted by the central circular prism on the central light blocking lens.
12. The large angle deflection transceiving integrated fiber collimator of claim 6, wherein: establishing a rectangular coordinate system by taking the centers of circles of rectangular planes of the 1# prism and the 2# prism as the original points, wherein the rectangular plane of the prism is an XOY plane, the X axis is the horizontal direction, the Y axis is the vertical direction, and emitted light enters along the positive direction of the Z axis; an included angle between an emergent beam passing through the double prisms and the Z axis is defined as a deflection angle of the emergent beam, and an included angle omega between a plane formed by the emergent beam and the Z axis and an XOZ plane is defined as an azimuth angle of the emergent beam; the included angle between the marking line of the 1# prism and the positive direction of the X axis is defined as the rotation angle of the 1# prism, the included angle between the marking line of the 2# prism and the positive direction of the X axis is defined as the rotation angle of the 2# prism, the rotation angle range of each prism is-pi, the anticlockwise direction is positive, and the clockwise direction is negative;
let the rotation angle of the current 1# prism be theta1The rotation angle of the 2# prism is theta2，θ1And theta2As known, the deflection angle and the azimuth angle ω of the outgoing beam after the outgoing beam passes through the double prism are calculated by the following formulas:
wherein α is the wedge angle of the central circular prism, n is the refractive index of the central circular prism, γ is the maximum deflection angle of the required emitted light,
is an intermediate variable.
13. The large angle deflection transceiving integrated fiber collimator of claim 6, wherein: establishing a rectangular coordinate system by taking the centers of circles of rectangular planes of the 1# prism and the 2# prism as the original points, wherein the rectangular plane of the prism is an XOY plane, the X axis is the horizontal direction, the Y axis is the vertical direction, and emitted light enters along the positive direction of the Z axis; an included angle between an emergent beam passing through the double prisms and the Z axis is defined as a deflection angle of the emergent beam, and an included angle omega between a plane formed by the emergent beam and the Z axis and an XOZ plane is defined as an azimuth angle of the emergent beam; the included angle between the marking line of the 1# prism and the positive direction of the X axis is defined as the rotation angle of the 1# prism, the included angle between the marking line of the 2# prism and the positive direction of the X axis is defined as the rotation angle of the 2# prism, the rotation angle range of each prism is-pi, the anticlockwise direction is positive, and the clockwise direction is negative;
the method sets the outgoing light beam of the outgoing light passing through the double prisms to meet the requirements of a deflection angle and an azimuth angle omega, and adopts the following stepsFormula solving of rotation angle theta of 1# prism1And the rotation angle theta of the 2# prism2：
Wherein alpha is the wedge angle of the central circular prism, n is the refractive index of the central circular prism, and eta, beta and H are intermediate variables;
the 1# prism and the 2# prism are driven by the prism driving mechanisms respectively corresponding to the 1# prism and rotate by corresponding angles, namely the rotation angle theta of the 1# prism1And the rotation angle theta of the 2# prism2And then the deflection angle of the emergent light beam passing through the double prisms is omega.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010763333.5A CN111722408B (en) | 2020-07-31 | 2020-07-31 | Large-angle deflection receiving-transmitting integrated optical fiber collimator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010763333.5A CN111722408B (en) | 2020-07-31 | 2020-07-31 | Large-angle deflection receiving-transmitting integrated optical fiber collimator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111722408A true CN111722408A (en) | 2020-09-29 |
| CN111722408B CN111722408B (en) | 2024-07-26 |
Family
ID=72574412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010763333.5A Active CN111722408B (en) | 2020-07-31 | 2020-07-31 | Large-angle deflection receiving-transmitting integrated optical fiber collimator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111722408B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112465705A (en) * | 2020-12-08 | 2021-03-09 | 福州大学 | Visual field expanding system and method based on two-aperture rotating biprism |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4350410A (en) * | 1980-10-08 | 1982-09-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Multiprism collimator |
| US4872747A (en) * | 1987-04-15 | 1989-10-10 | Cyberoptics Corporation | Use of prisms to obtain anamorphic magnification |
| US5278813A (en) * | 1991-05-10 | 1994-01-11 | Hitachi, Ltd. | Optical recording/reproducing apparatus with light beam deflection means including wedge-shaped prism |
| CN106019580A (en) * | 2016-07-19 | 2016-10-12 | 华中科技大学 | Flexible wide optical filter with super-wide tuning range |
| CN109239939A (en) * | 2018-10-16 | 2019-01-18 | 中国人民解放军国防科技大学 | Optical fiber laser array coherent synthesis collimator based on prism |
| CN109387948A (en) * | 2017-08-04 | 2019-02-26 | 维林光电(苏州)有限公司 | A kind of optical fiber output laser |
| US20200116652A1 (en) * | 2017-07-21 | 2020-04-16 | Isvision (Tianjin) Technology Co., Ltd | Method and device for detecting defect of cover lens in laser welding system on automobile production line |
| CN212276118U (en) * | 2020-07-31 | 2021-01-01 | 中国人民解放军国防科技大学 | Large-angle deflection receiving and transmitting integrated optical fiber collimator |
-
2020
- 2020-07-31 CN CN202010763333.5A patent/CN111722408B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4350410A (en) * | 1980-10-08 | 1982-09-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Multiprism collimator |
| US4872747A (en) * | 1987-04-15 | 1989-10-10 | Cyberoptics Corporation | Use of prisms to obtain anamorphic magnification |
| US5278813A (en) * | 1991-05-10 | 1994-01-11 | Hitachi, Ltd. | Optical recording/reproducing apparatus with light beam deflection means including wedge-shaped prism |
| CN106019580A (en) * | 2016-07-19 | 2016-10-12 | 华中科技大学 | Flexible wide optical filter with super-wide tuning range |
| US20200116652A1 (en) * | 2017-07-21 | 2020-04-16 | Isvision (Tianjin) Technology Co., Ltd | Method and device for detecting defect of cover lens in laser welding system on automobile production line |
| CN109387948A (en) * | 2017-08-04 | 2019-02-26 | 维林光电(苏州)有限公司 | A kind of optical fiber output laser |
| CN109239939A (en) * | 2018-10-16 | 2019-01-18 | 中国人民解放军国防科技大学 | Optical fiber laser array coherent synthesis collimator based on prism |
| CN212276118U (en) * | 2020-07-31 | 2021-01-01 | 中国人民解放军国防科技大学 | Large-angle deflection receiving and transmitting integrated optical fiber collimator |
Non-Patent Citations (3)
| Title |
|---|
| 周远;鲁亚飞;黑沫;熊飞湍;李凯;范大鹏;: "旋转双棱镜光束指向的反向解析解", 光学精密工程, no. 07, 15 July 2013 (2013-07-15) * |
| 周远;鲁亚飞;黑沫;熊飞湍;李凯;范大鹏;: "旋转双棱镜光束指向解析解", 光学精密工程, no. 06, 15 June 2013 (2013-06-15) * |
| 陈大勇;张立航;谌雨章;: "LD光束准直方法研究", 光学仪器, no. 05, 15 October 2010 (2010-10-15) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112465705A (en) * | 2020-12-08 | 2021-03-09 | 福州大学 | Visual field expanding system and method based on two-aperture rotating biprism |
| CN112465705B (en) * | 2020-12-08 | 2022-08-19 | 福州大学 | Visual field expanding system and method based on two-aperture rotating biprism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111722408B (en) | 2024-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108919289B (en) | Laser relay redirection energy transmission device for unmanned aerial vehicle | |
| WO2021197403A1 (en) | Lidar for long-distance detection and detection method therefor | |
| WO2021035428A1 (en) | Laser radar and automatic driving equipment | |
| US20210341610A1 (en) | Ranging device | |
| CN210015229U (en) | Distance detection device | |
| CN112713935B (en) | Free space optical communication scanning tracking method, system, device and medium | |
| CN108415148B (en) | Photoelectric pod multi-sensor common optical path system | |
| CN212276118U (en) | Large-angle deflection receiving and transmitting integrated optical fiber collimator | |
| CN113296079B (en) | Remote photoelectric detection system | |
| EP3797328A1 (en) | Optical scanning device with beam compression and expansion | |
| CN114706164A (en) | Waveguide conversion chip and laser radar | |
| CN109765542B (en) | Multi-line laser radar | |
| US20230359054A1 (en) | Transmitting-receiving coaxial laser ranging device and optical module | |
| CN211718520U (en) | Multi-line laser radar | |
| CN111722408A (en) | Large-angle deflection receiving and transmitting integrated optical fiber collimator | |
| WO2020062256A1 (en) | Light beam scanning system, distance detection apparatus, and electronic device | |
| WO2021035427A1 (en) | Lidar and autonomous driving device | |
| CN111308444A (en) | Laser radar system | |
| CN117420529A (en) | Integrated laser radar detection suppression method | |
| CN216748067U (en) | Laser radar scanning head with isolated transmitting and receiving light paths | |
| CN210572725U (en) | Multi-line laser radar | |
| US20220082665A1 (en) | Ranging apparatus and method for controlling scanning field of view thereof | |
| US20210341588A1 (en) | Ranging device and mobile platform | |
| CN106501948B (en) | Double-channel optical rotary coupler | |
| CN113237439B (en) | Decoupling tracking method of periscopic laser communication terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |