CN211478735U - Laser pointing stability control device based on light spot analysis - Google Patents
Laser pointing stability control device based on light spot analysis Download PDFInfo
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- CN211478735U CN211478735U CN201922294452.6U CN201922294452U CN211478735U CN 211478735 U CN211478735 U CN 211478735U CN 201922294452 U CN201922294452 U CN 201922294452U CN 211478735 U CN211478735 U CN 211478735U
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Abstract
The utility model provides a laser pointing stable control device based on facula analysis, the device comprises a plurality of modules which are connected in series, each module is provided with an entrance light hole and an exit light hole, the entrance light hole of the first module is used for receiving laser generated by a laser, the exit light hole of the previous module is aligned with the entrance light hole of the next module; the first module comprises a first mirror which is adjustable in multiple dimensions; the second and the later modules comprise a second reflector and a camera, the light inlet and the light outlet of the second reflector are respectively positioned on the optical axis of the incident light and the reflected light of the second reflector, and the camera is positioned on one side of the transmitted light of the partial reflector; the second mirror of the second to penultimate module is a multi-dimensionally adjustable partial mirror, and the second mirror of the last module is a beam splitter with a fixed angle. The utility model discloses can accomplish the monitoring and the control of the directional stability of light beam, the structure is simplified, is convenient for adjust light path or investigation problem, and the structure is nimble variable.
Description
Technical Field
The utility model relates to a directional stability control technical field of light beam especially relates to a directional stability control device of laser based on facula analysis.
Background
Laser (beam) pointing stability is defined in the national standard as the 2-fold standard deviation of the angular movement of the laser beam in the vertical propagation direction. Due to the influence of various small disturbances, the angle of the mirror in the actual optical path may change, so that the finally emitted laser light is unstable and shifts. This stability of the laser beam can also be approximated by counting the coordinate shift of the spot projection of the beam on the cross-section.
The effect of the pointing stability of the laser in the optical system is mainly reflected in the accuracy affecting the optical process or procedure, and higher stability often means higher processing accuracy or measurement results. With the development of industry, the pointing stability of laser becomes more and more important in practical applications in the fields of laser processing, laser communication, target indication, and the like.
The prior art regarding laser pointing stability control is as follows:
(1) in the practical application of the equipment in the field of laser processing and the like, a plurality of reflecting mirrors are often used for forming a light path, and when the light path is adjusted, the light path is difficult to adjust due to the fact that the state of the light beam inside cannot be seen. The difficulty is further increased if the beam is also greatly displaced during the adjustment due to the long adjustment time. Meanwhile, the beam deviation in the machining process may also directly affect the quality of the machining result.
(2) The existing beam stability control device only comprises a single or two reflecting mirrors, and in order to reduce the influence of disturbance of the equipment, the existing beam stability control device is usually arranged at the tail end of an optical path of the equipment, and the reflecting mirrors in the front-end optical path are fixed. If the outgoing beam of the laser as a light source is shifted, it may be necessary to adjust a mirror included in the previous optical path.
For most processes, the offset of the laser is small, and the laser is often affected by accumulation over a long time, for example, adjustment is needed every few hours, so that the real-time requirement for adjustment is not very high. Aiming at the application requirements, a laser pointing stabilization control device based on spot analysis is provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a directional stable control device of laser based on facula analysis aims at being used for solving the problem that the current scheme regulation degree of difficulty is big, can not adjust comprehensively.
The utility model discloses a realize like this:
the utility model provides a laser pointing stable control device based on facula analysis, which comprises a plurality of modules which are connected in series, wherein each module is provided with an entrance light hole and an exit light hole, the entrance light hole of the first module is used for receiving laser generated by a laser, and the exit light hole of the previous module is aligned with the entrance light hole of the next module;
the first module comprises a first reflector which can be adjusted in multiple dimensions, and the adjusting center of the first reflector is fixed and positioned on the optical axis;
the second and the later modules comprise a second reflector and a camera, the light inlet and the light outlet of the second reflector are respectively positioned on the optical axis of incident light and reflected light of the second reflector, the camera is positioned on the light transmission side of the partial reflector, and the front end of the camera is provided with a lens of a focusing lens; the second reflecting mirror of the second to the last module is a multi-dimensionally adjustable partial reflecting mirror, the adjusting center of the partial reflecting mirror is fixed and is positioned on the optical axis, the second reflecting mirror of the last module is a beam splitter with a fixed angle, and the beam splitter and the optical axis form an angle of 45 degrees.
Further, the first reflector is a multi-dimensional adjustable total reflector.
Furthermore, the first reflector is a multi-dimensional adjustable partial reflector, and a camera is arranged on one transmission light side of the first reflector.
Further, an attenuator is installed between the camera and the second reflecting mirror.
Furthermore, the adjusting center of the partial reflector of the second to penultimate modules and the center of the light-sensitive surface of the corresponding camera are coaxial, the camera and the lens are perpendicular to the optical axis, and the light-sensitive surface of the camera is located on the focal plane of the lens.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a laser pointing stability control device based on facula analysis, under the prerequisite that incident laser is on a parallel with the optical axis, utilize only the parallel light that is on a parallel with the optical axis propagation can assemble the principle in the focus position, accomplish the monitoring and the control of light beam pointing stability; the adjustment of each reflector is only related to the camera of the next module, the relative position among a plurality of modules and the influence of the relative position do not need to be considered, and the structure is greatly simplified; the light spot image passed by each reflector in the light path can be checked, so that the light path can be adjusted or problems can be checked conveniently; a plurality of modules can be connected in series, the reflecting mirrors in the modules can adopt adjustment modes such as manual operation, electric operation, piezoelectric operation and the like, and the structure is flexible and variable.
Drawings
Fig. 1 is a schematic structural diagram of a laser pointing stabilization control device based on light spot analysis according to an embodiment of the present invention;
fig. 2 is a structural diagram of second and subsequent modules according to an embodiment of the present invention;
fig. 3 is a flowchart of the working process of the laser pointing stabilization control device based on the light spot analysis provided by the embodiment of the present invention.
Description of reference numerals: 1-light inlet hole, 2-light outlet hole, 3-second reflector, 4-camera and 5-lens.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a laser pointing stability control device based on spot analysis, including a plurality of modules connected in series, each module has an optical input hole 1 and an optical output hole 2, the optical input hole 1 of the first module is used for receiving laser generated by a laser, and the optical output hole 2 of the previous module is aligned with the optical input hole 1 of the next module; the first module comprises a multidimensional adjustable first reflector, the deflection angle of the multidimensional adjustable first reflector can be adjusted in the X or Y direction, and the adjusting center of the first reflector is fixed and positioned on the optical axis; each of the second and subsequent modules comprises a second reflecting mirror 3 and a camera 4, the light inlet 1 and the light outlet 2 of the modules are respectively positioned on the optical axis of incident light and reflected light of the second reflecting mirror, the camera 4 is positioned on the light transmitting side of the partial reflecting mirror 3, and the front end of the camera 4 is provided with a lens 5 of a focusing lens for monitoring the position of the incident light on the second reflecting mirror 3. The second reflector 3 of each module from the second to the last module, namely the first module and the last module, is a multi-dimensionally adjustable partial reflector, the adjusting center of the partial reflector is fixed and is positioned on the optical axis, and the partial reflector can select proper transmittance according to actual conditions; the second mirror 3 of last module is the beam splitter of fixed angle, and its angle is not adjustable, just the beam splitter is 45 degrees angles with the optical axis, and accessible fixed mounting mode realizes. Optionally, the transmission and reflection optical paths of the last module can be interchanged, i.e. the monitoring camera can be mounted on the reflection or transmission surface according to the actual application. Generally, the device at least comprises a first module and a last module, and the specific number of the modules can be changed according to the actual needs of the optical path length, the reflection times and the like of the equipment. The reflectors can be adjusted manually, electrically, piezoelectrically and the like, and are selected according to actual needs.
In one embodiment, the first module is not provided with a camera, and the first reflector is a multi-dimensional adjustable total reflector. In another embodiment, the first mirror is a multi-dimensionally adjustable partial mirror, and a camera is provided on the light transmitting side of the first mirror for monitoring the stability of the laser.
Preferably, an attenuator, which may be an electrically-adjusted attenuator or a manually-adjusted attenuator, is installed between the camera 4 and the second mirror 3 to control the intensity of the laser light entering the camera.
Further, the adjusting center of the partial reflector of the second to penultimate modules and the center of the light sensing surface of the corresponding camera 4 are coaxial, the camera 4 and the lens 5 are perpendicular to the optical axis, and the light sensing surface of the camera 4 is located on the focal plane of the lens 5.
When the device normally works, the laser generates laser, enters from the center of the light inlet hole 1 of the first module in parallel to the optical axis and strikes on the adjustable reflector of the first module, and then emits from the light outlet hole 2 of the first module in parallel to the optical axis into the second module and strikes on the adjustable reflector of the second module. The camera 4 in the second module will now see the spot in the very center of the image, so that the mirror does not have to be adjusted and the laser light will be reflected directly from the center of the mirror into the latter module. And so on, until the laser passes through all modules, as shown with reference to fig. 3.
In this embodiment, the light sensing surface of the camera is located on the focal plane of the lens, and as can be seen from geometric optics, only when the laser beam is incident parallel to the optical axis, the laser beam is converged at the focal point, and the light spot seen by the camera is located at the center of the image. Other angles of parallel light incident will converge on other points in the focal plane. Therefore, the offset of the position of the light spot relative to the center of the image is monitored by the camera in the module, and then the deflection angle of the reflecting mirror in the previous module is adjusted according to the offset, so that the light spot is moved to the center of the image, and the light beam can be ensured to be always parallel to the optical axis. And because the laser generated by the laser is incident along the optical axis, the whole optical path after adjustment is theoretically correct.
The embodiment of the utility model provides a still provide a directional stability control method of laser based on facula analysis, adopt foretell directional stability control device of laser based on facula analysis, this method is as follows:
when a mirror is shifted, taking the example of the shift of the module n, the laser light between the mirrors of the modules n and n +1 will no longer be parallel to the optical axis, and the optical path in front of the module n will still be correct. The mirror adjustment is performed according to the following steps:
(1) and starting from the second module, sequentially checking the offset of the light spot position in the camera of each module relative to the image center, and skipping if the offset is smaller than an error range until a module with the offset exceeding the error range is found, wherein the error range is determined according to the requirements of the whole optical system. In this embodiment, the camera of module n can see that the light spot is located at the center of the image, and the camera of module n +1 can see that the light spot is not located at the center of the image.
(2) And adjusting the deflection angle of the reflector in the module n according to the offset of the position of the light spot observed by the camera of the module n +1 relative to the center of the image until the light spot is positioned at the right center of the image. The specific adjustment method is as follows:
assuming that the angle of the laser deviation relative to the optical axis is θ, the deviation of the focal spot seen by the camera is Δ, the focal length of the lens is f, and the laser is a parallel beam, it can be known according to the geometrical optics principle of the convex lens that:
Δ=f*tanθ；
through the relation, the offset of the laser angle is calculated according to the offset seen by the camera, and then the angle theta/2 of the reflector is reversely adjusted. The adjustment may be accomplished manually, by computer feedback control, or otherwise. As can be seen from the above-described principle, the laser should propagate along the original optical path before the deviation.
(3) The structure of the module n +2 is the same as that of the module n + 1. When step (2) is completed, the same operation as that in step (2) is taken in module n +2, the mirror of module n +1 is adjusted until the light spot in the camera of module n +2 is located at the center of the image, and so on until the penultimate module.
Since the last module is a beam splitter, which is fixedly mounted at a standard angle, no adjustment is necessary.
The adjustment process can be performed once every a period of time, and can also be continuously performed in real time without interruption according to requirements.
If the laser is misaligned when being incident, the incident light is not coincident with the optical axis, and as long as the light beam is parallel to the optical axis and is not shielded, the scheme is still effective.
It should be noted that, in the subsequent reflection light path of the device, if the control of the pointing stability is not required, the adjustable mirror can be replaced by a fixed mirror.
To sum up, the embodiment of the present invention provides a laser pointing stability control device based on spot analysis, which utilizes the principle that only parallel light propagating parallel to the optical axis can be converged at the focus position on the premise that the incident laser is parallel to the optical axis, to complete the monitoring and control of the light beam pointing stability; the adjustment of each reflector is only related to the camera of the next module, the relative position among a plurality of modules and the influence of the relative position do not need to be considered, and the structure is greatly simplified; the light spot image passed by each reflector in the light path can be checked, so that the light path can be adjusted or problems can be checked conveniently; a plurality of modules can be connected in series, the reflecting mirrors in the modules can adopt adjustment modes such as manual operation, electric operation, piezoelectric operation and the like, and the structure is flexible and variable.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a directional stable control device of laser based on facula analysis which characterized in that: the laser module comprises a plurality of modules which are connected in series, wherein each module is provided with a light inlet hole and a light outlet hole, the light inlet hole of the first module is used for receiving laser generated by a laser, and the light outlet hole of the previous module is aligned with the light inlet hole of the next module;
the first module comprises a first reflector which can be adjusted in multiple dimensions, and the adjusting center of the first reflector is fixed and positioned on the optical axis;
each second and later module comprises a second reflector and a camera, wherein a light inlet and a light outlet of the second reflector are respectively positioned on the optical axis of incident light and reflected light of the second reflector, the camera is positioned on the light transmission side of the second reflector, and the front end of the camera is provided with a lens of a focusing lens; the second reflecting mirror of the second to the last module is a multi-dimensionally adjustable partial reflecting mirror, the adjusting center of the partial reflecting mirror is fixed and is positioned on the optical axis, the second reflecting mirror of the last module is a beam splitter with a fixed angle, and the beam splitter and the optical axis form an angle of 45 degrees.
2. The laser pointing stabilization control apparatus based on spot analysis according to claim 1, characterized in that: the first reflector is a multidimensional adjustable total reflector.
3. The laser pointing stabilization control apparatus based on spot analysis according to claim 1, characterized in that: the first reflector is a multi-dimensional adjustable partial reflector, and one camera is arranged on one side of the transmission light of the first reflector.
4. The laser pointing stabilization control apparatus based on spot analysis according to claim 1, characterized in that: an attenuator is mounted between the camera and the second mirror.
5. The laser pointing stabilization control apparatus based on spot analysis according to claim 1, characterized in that: the adjusting center of the partial reflector of the second module to the penultimate module is coaxial with the center of the light-sensitive surface of the corresponding camera, the camera and the lens are perpendicular to the optical axis, and the light-sensitive surface of the camera is positioned on the focal plane of the lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922294452.6U CN211478735U (en) | 2019-12-19 | 2019-12-19 | Laser pointing stability control device based on light spot analysis |
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| CN201922294452.6U CN211478735U (en) | 2019-12-19 | 2019-12-19 | Laser pointing stability control device based on light spot analysis |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879453A (en) * | 2019-12-19 | 2020-03-13 | 武汉华工激光工程有限责任公司 | Laser pointing stability control device and method based on light spot analysis |
| CN117191199A (en) * | 2023-11-07 | 2023-12-08 | 四川中久大光科技有限公司 | Beam pointing monitoring system and method |
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2019
- 2019-12-19 CN CN201922294452.6U patent/CN211478735U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879453A (en) * | 2019-12-19 | 2020-03-13 | 武汉华工激光工程有限责任公司 | Laser pointing stability control device and method based on light spot analysis |
| CN117191199A (en) * | 2023-11-07 | 2023-12-08 | 四川中久大光科技有限公司 | Beam pointing monitoring system and method |
| CN117191199B (en) * | 2023-11-07 | 2024-01-23 | 四川中久大光科技有限公司 | Beam pointing monitoring system and method |
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