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CN106443951B - Atmospheric coherence length instrument automatic focusing device and method - Google Patents

Atmospheric coherence length instrument automatic focusing device and method Download PDF

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Publication number
CN106443951B
CN106443951B CN201611178904.9A CN201611178904A CN106443951B CN 106443951 B CN106443951 B CN 106443951B CN 201611178904 A CN201611178904 A CN 201611178904A CN 106443951 B CN106443951 B CN 106443951B
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CN
China
Prior art keywords
automatic focusing
camera
take
housing
slide rail
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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.)
Expired - Fee Related
Application number
CN201611178904.9A
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Chinese (zh)
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CN106443951A (en
Inventor
谭逢富
张巳龙
何枫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei Institutes of Physical Science of CAS
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Hefei Institutes of Physical Science of CAS
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Priority to CN201611178904.9A priority Critical patent/CN106443951B/en
Publication of CN106443951A publication Critical patent/CN106443951A/en
Application granted granted Critical
Publication of CN106443951B publication Critical patent/CN106443951B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J9/00Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32Means for focusing
    • G03B13/34Power focusing
    • G03B13/36Autofocus systems

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Telescopes (AREA)
  • Studio Devices (AREA)

Abstract

The invention discloses the automatic focusing device of atmospheric coherence length instrument automatic focusing, telescope and camera are correspondingly arranged on atmospheric coherence length instrument, light is imaged by the telescope on the magazine camera target surface, and the automatic focusing device is connect with camera;Wherein, the automatic focusing device includes:Micro slide rail, take-up housing, controller;The take-up housing is fixedly connected with the camera, and the take-up housing is arranged on the micro slide rail, and the camera can be driven to be moved up and down along the micro slide rail;The controller is connect with the camera, the centroid position of two hot spots for obtaining the image on the camera target surface, and the spacing of the camera and the telescope is adjusted according to the centroid position of described two hot spots.The camera is adjusted at a distance from the telescope by controller control, realizes the technique effect of automatic focusing.

Description

Atmospheric coherence length instrument automatic focusing device and method
Technical field
The present invention relates to optical fields, more particularly to atmospheric coherence length instrument automatic focusing device and method.
Background technology
When light transmits in turbulent atmosphere, since refractive index fluctuation causes light wave front to distort in air, light beam is caused to float The turbulence effects such as shifting, Beam spreading and light intensity fluctuation, when describing turbulence effect, widely used parameter is atmospheric coherence length, Atmospheric coherence length describes the synthesis turbulence intensity in transmission path, is studied for Laser Atmospheric Transmission and adaptive optics Important Parameters.
The measurement method of atmospheric coherence length instrument:Light beam is received through telescope, is focused on camera target surface, by camera number According to acquisition with after processing system, two hot spots of barycenter random fluctuation are obtained, two light in the image by calculating certain frame number The fluctuating variance of spot barycenter spacing obtains atmospheric coherence length.
When measuring atmospheric coherence length, tested beacon beam is variation at a distance from telescope, with the variation of distance, is Beacon beam is realized in focal plane imaging, needs to adjust the distance between receiving telescope and camera, by light focusing in camera On focal plane;Receiving telescope and other optical systems, are influenced by day and night temperature, generate phenomenon of expanding with heat and contract with cold, will produce At this moment defocus is also required to the spacing of fine tuning receiving telescope and camera, to focus on beacon beam on the focal plane of camera.
Focal length adjustment device in atmospheric coherence length instrument in the prior art is realized by manually mode so that Equipment can not achieve automatic focusing.
Invention content
The object of the present invention is to provide the atmospheric coherence length instrument automatic focusing devices and method that can realize automatic focusing.
To achieve the above object, the present invention provides following schemes:
The automatic focusing device of atmospheric coherence length instrument automatic focusing of the present invention is correspondingly arranged prestige on atmospheric coherence length instrument Remote mirror and camera, light are imaged by the telescope on the magazine camera target surface, the automatic focusing device with Camera connects;Wherein, the automatic focusing device includes:Micro slide rail, take-up housing, motor, controller;
The take-up housing is fixedly connected with the camera, and the take-up housing is arranged on the micro slide rail, being capable of band The camera is moved to move up and down along the micro slide rail;
The motor is connect with the take-up housing, for driving the take-up housing to be moved up and down along the micro slide rail.
The controller is connect with the camera and the motor respectively, for obtaining the image on the camera target surface The centroid position of two hot spots, and drive the motor to adjust the take-up housing in institute according to the centroid position of described two hot spots The shift position on micro slide rail is stated, to change the spacing of the camera and the telescope.
Optionally, the automatic focusing device further includes:Pedestal, miniature displacement sensor;
The pedestal is arranged at the telescope light-emitting window, and the micro slide rail is provided on the pedestal;
The fixing end of the miniature displacement sensor is arranged on the base, the sliding end of the miniature displacement sensor It is connect with the take-up housing, the miniature displacement sensor is connect with the controller, for detecting the take-up housing described Present position values on micro slide rail, and it is sent to the controller;
The controller is additionally operable to be respectively compared present position values and setting of the take-up housing on the micro slide rail Upper limit place value and setting lower limit place value size, and the take-up housing is adjusted on the micro slide rail according to comparison result Shift position.
Optionally, the automatic focusing device further includes:Reflective mirror, reflective mirror mounting and adjusting pedestal;
The reflective mirror is arranged on the reflective mirror mounting and adjusting pedestal, for the emergent light of the telescope to be imported into In the camera;
The reflective mirror mounting and adjusting pedestal setting is on the base.
Optionally, the automatic focusing device further includes:Camera mounting base, the camera are mounted on the camera mounting base On, the camera mounting base is connect with the take-up housing.
Atmospheric coherence length instrument, telescope and camera are correspondingly arranged on the atmospheric coherence length instrument, and light passes through described Telescope is imaged on the magazine camera target surface;
Be additionally provided on the atmospheric coherence length instrument according to atmospheric coherence length instrument automatic focusing described above from Dynamic focus control;The automatic focusing device is connect with the camera.
According to specific embodiment provided by the invention, the invention discloses following technique effects:Atmospheric coherence length instrument is certainly The automatic focusing device of dynamic focusing is fixed on by the way that the camera is arranged on take-up housing, and controlling the take-up housing by controller exists It is moved on the micro slide rail, realizes automatic adjustment camera at a distance from telescope, achieved the effect that automatic focusing.
To achieve the above object, the present invention provides following schemes:
The automatic focusing method of atmospheric coherence length instrument automatic focusing of the present invention, the automatic focusing method use is according to upper The automatic focusing device or the atmospheric coherence length according to claim for stating the atmospheric coherence length instrument automatic focusing Instrument, the automatic focusing method include:
Step 1:In control slide block seat during mobile on the micro slide rail, it is imaged on acquisition camera target surface The centroid position of two hot spots;
Step 2:The barycenter of described two hot spots is calculated according to the centroid position for two hot spots being imaged on camera target surface Spacing;
Step 3:The spacing of the barycenter and preset spacing are made into difference and obtain the absolute value of difference;
Step 4:Judge whether the absolute value of the difference is less than setting return difference;If it is, controlling the take-up housing edge The micro slide rail not move;Otherwise step 5 is executed;
Step 5:Judge whether the spacing of the barycenter is more than the spacing of the setting;If it is, controller is placed in just To focus state, step 6 is executed;Otherwise, controller is placed in reversed focus state, executes step 7;
Step 6:It controls the take-up housing to focus along the micro slide rail forward direction, executes step 1;
Step 7:It controls the take-up housing reversely to focus along the micro slide rail, executes step 1.
According to specific embodiment provided by the invention, the invention discloses following technique effects:According on camera target surface at The centroid position of two hot spots of picture calculates the spacing of the barycenter of described two hot spots;By the spacing of the barycenter with preset Spacing make difference obtain the absolute value of difference;It is compared to control the take-up housing edge by the absolute value and setting return difference The case where micro slide rail moves up and down, the effect of automatic focusing is realized.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.
Fig. 1 is the explosive view of the automatic focusing device of the atmospheric coherence length instrument of the present invention;
Fig. 2 is the front view of the automatic focusing device of the atmospheric coherence length instrument of the present invention;
Fig. 3 is the side view of the automatic focusing device of the atmospheric coherence length instrument of the present invention;
Fig. 4 is the atmospheric coherence length instrument with automatic focusing device;
Fig. 5 is the flow chart of the automatic focusing method of the atmospheric coherence length instrument of the present invention;
Fig. 6 is the simplification index path of atmospheric coherence length instrument.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide atmospheric coherence length instrument automatic focusing device and automatic focusing methods.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real Applying mode, the present invention is described in further detail.
Atmospheric coherence length instrument includes telescope 11, automatic focusing device 12, rack 14, controller 13.The controller 13 are installed in the rack 14.The automatic focusing device 12 of atmospheric coherence length instrument automatic focusing, on atmospheric coherence length instrument It is correspondingly arranged telescope 11 and camera 8, light is imaged by the telescope 11 on camera target surface in the camera 8, institute Automatic focusing device 12 is stated to connect with camera 8;As shown in Figure 1, the automatic focusing device 12 includes:Micro slide rail 2, take-up housing 3, controller 13;The take-up housing 3 is fixedly connected with the camera 8, and the take-up housing 3 is arranged on the micro slide rail 2, And the camera 8 can be driven to be moved up and down along the micro slide rail 2;The controller 13 respectively with the camera 8 and institute It states motor 7 to connect, the centroid position of two hot spots for obtaining the image on 8 target surface of the camera, and according to described two The centroid position of hot spot adjusts sliding position of the take-up housing 3 on the micro slide rail 2, to change the camera 8 and institute State the spacing of telescope 11.
In the present embodiment, guide groove, the width of guide groove and the miniature cunning are processed on the mounting surface of the take-up housing 3 The slider width of rail 2 is the same, and guarantee not will produce inclination during the installation process.
The camera 8 is the measurement detection part of atmospheric coherence length, while providing focal length position for automatic focusing device 12 The feedback set.
The automatic focusing device 12 further includes:Pedestal 1, miniature displacement sensor 6;The pedestal 1 is arranged in the prestige At 11 light-emitting window of remote mirror, and the micro slide rail 2 is provided on the pedestal 1;The fixing end of the miniature displacement sensor 6 is set It sets on the pedestal 1, the sliding end of the miniature displacement sensor 6 is connect with the take-up housing 3, the miniature displacement sensing Device is connect with the controller 13, for detecting current displacement of the take-up housing 3 on the micro slide rail 2, and is sent to The controller 13 realizes the position feedback of positioning operation.
The controller 13 is additionally operable to be respectively compared the value of current displacement of the take-up housing 3 on the micro slide rail 2 With the size of the lower limit place value of the upper limit place value and setting of setting, and the take-up housing 3 is adjusted described micro- according to comparison result Shift position on type sliding rail 2 realizes software limit function for preventing the take-up housing 3 to be detached from the micro slide rail 2.
The automatic focusing device 12 further includes:Reflective mirror 9, reflective mirror mounting and adjusting pedestal 10;In the present embodiment, described Reflective mirror 9 is 45 ° of reflective mirrors.
The reflective mirror 9 is arranged on the reflective mirror mounting and adjusting pedestal 10, and the reflective mirror mounting and adjusting pedestal 10 is arranged The adjustment mechanism for having bidimensional, the angle for adjusting the reflective mirror 9, for the emergent light of the telescope 9 to be imported into institute It states in camera 8;The reflective mirror mounting and adjusting pedestal 10 is arranged on the pedestal 1.
The automatic focusing device 12 further includes:Motor 7, the motor 7 is connect with the take-up housing 3, for driving It states take-up housing 3 to move up and down along the micro slide rail 2, in the present embodiment, the motor 7 is linear stepping motor.
Upper limit position block 51, lower position block 52, the upper limit position block 51 and lower position block are provided on the leading screw of the motor 7 The 52 movement section for limiting leading screw prevents motor 7 from falling.
The automatic focusing device 12 further includes:Camera mounting blocks 4, the camera 8 are fixed on the camera mounting blocks 4 On, it needs to be closely connected between the camera mounting blocks 4 and the take-up housing 3, it is ensured that the inclining in vertical direction of camera 8 It is tiltedly small as possible;The camera mounting blocks 4 are the transition members between the camera 8 and the take-up housing 3, in order to facilitate camera 8 Dismounting and maintenance.
The present invention also provides atmospheric coherence length instrument, above-mentioned automatic focusing device is provided on the atmospheric coherence length instrument 12, and be correspondingly arranged telescope 11 and camera 8, light by the telescope 11 on camera target surface in the camera 8 at Picture;The automatic focusing device 12 is connect with camera 8.
As shown in figure 4, when installing automatic focusing device 12 on atmospheric coherence length instrument, the automatic focusing device 12 is pacified Ensure focus control mounted in 11 light-emitting window of receiving telescope of atmospheric coherence length instrument in order to ensure the uniqueness in focusing direction Installation site and the maximum distance of imaging focal plane cannot be more than L, the occurrence of L by the focal length of the telescope 11, bore, The angle of wedge of wedge mirror 14 determines.
The automatic focusing method of atmospheric coherence length instrument automatic focusing, the automatic focusing method use is according to above-mentioned automatic Focus control 12, the automatic focusing method include:
Step 100:During mobile on the micro slide rail, the matter for two hot spots being imaged on camera target surface is obtained Heart position;
Step 200:The barycenter of described two hot spots is calculated according to the centroid position for two hot spots being imaged on camera target surface Spacing;
Step 300:The spacing of the barycenter and preset spacing are made into difference and obtain the absolute value of difference;
Step 400:Judge whether the absolute value of the difference is less than setting return difference;
Step 401:It is not moved along the micro slide rail if it is, controlling the take-up housing;It is no to then follow the steps 500;
Step 500:Judge whether the spacing of the barycenter is more than the spacing of the setting;
Step 501:If it is, controller is placed in positive focus state, step 600 is executed;
Step 502:Otherwise, controller is placed in reversed focus state, executes step:700;
Step 600:It controls the take-up housing to focus along the micro slide rail forward direction, executes step 100;
Step 700:It controls the take-up housing reversely to focus along the micro slide rail, executes step 100.
In the present embodiment, as shown in fig. 6, D0 is the centroid distance of two picture points on focal plane, D1 is two behind focal plane The centroid distance of a picture point, D2 are the centroid distance of focal plane the first two picture point.
By the centroid distance D0 of two picture points on the centroid distance D1 of latter two picture point of focal plane and the focal plane Make difference and obtains the absolute value of difference;Judge whether the absolute value of the difference is less than setting return difference;If it is, controlling the cunning Block 3 is not moved along the micro slide rail 2;Otherwise it controls the take-up housing 3 to move up and down along the micro slide rail 2, subtract The distance between small camera 8 and telescope 11.
By the centroid distance D0 of two picture points on the centroid distance D2 of focal plane the first two picture point and the focal plane Make difference and obtains the absolute value of difference;Judge whether the absolute value of the difference is less than setting return difference;If it is, controlling the cunning Block 3 is not moved along the micro slide rail 2;Otherwise it controls the take-up housing 3 to move up and down along the micro slide rail 2, increase Big the distance between camera 8 and telescope 11.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
Principle and implementation of the present invention are described for specific case used herein, and above example is said The bright method and its core concept for being merely used to help understand the present invention;Meanwhile for those of ordinary skill in the art, foundation The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not It is interpreted as limitation of the present invention.

Claims (6)

1. the automatic focusing device of atmospheric coherence length instrument automatic focusing, which is characterized in that correspondence is set on atmospheric coherence length instrument Telescope and camera are set, light is imaged by the telescope on the magazine camera target surface, the automatic focusing dress It sets and is connect with camera;Wherein, the automatic focusing device includes:Micro slide rail, take-up housing, motor, controller;
The take-up housing is fixedly connected with the camera, and the take-up housing is arranged on the micro slide rail, can drive institute Camera is stated to move up and down along the micro slide rail;
The motor is connect with the take-up housing, described for driving the take-up housing to be moved up and down along the micro slide rail Controller is connect with the camera and the motor respectively, the matter of two hot spots for obtaining the image on the camera target surface Heart position, and drive the motor to adjust the take-up housing on the micro slide rail according to the centroid position of described two hot spots Shift position, to change the spacing of the camera and the telescope.
2. the automatic focusing device of atmospheric coherence length instrument automatic focusing according to claim 1, which is characterized in that described Automatic focusing device further includes:Pedestal, miniature displacement sensor;
The pedestal is arranged at the telescope light-emitting window, and the micro slide rail is provided on the pedestal;
The fixing end of the miniature displacement sensor is arranged on the base, the sliding end of the miniature displacement sensor and institute Take-up housing connection is stated, the miniature displacement sensor is connect with the controller, for detecting the take-up housing described miniature Present position values on sliding rail, and it is sent to the controller;
The controller is additionally operable to be respectively compared the upper of present position values and setting of the take-up housing on the micro slide rail The size of limit value and the lower limit place value of setting, and shifting of the take-up housing on the micro slide rail is adjusted according to comparison result Dynamic position.
3. the automatic focusing device of atmospheric coherence length instrument automatic focusing according to claim 2, which is characterized in that described Automatic focusing device further includes:Reflective mirror, reflective mirror mounting and adjusting pedestal;
The reflective mirror is arranged on the reflective mirror mounting and adjusting pedestal, described for the emergent light of the telescope to be imported into In camera;
The reflective mirror mounting and adjusting pedestal setting is on the base.
4. the automatic focusing device of atmospheric coherence length instrument automatic focusing according to claim 1, which is characterized in that described Automatic focusing device further includes:Camera mounting base, the camera be mounted on the camera mounting base on, the camera mounting base with The take-up housing connection.
5. atmospheric coherence length instrument, which is characterized in that be correspondingly arranged telescope and camera, light on the atmospheric coherence length instrument It is imaged on the magazine camera target surface by the telescope;
Be additionally provided on the atmospheric coherence length instrument atmospheric coherence length instrument according to any one of claim 1-4 from The automatic focusing device of dynamic focusing;The automatic focusing device is connect with the camera.
6. the automatic focusing method of atmospheric coherence length instrument automatic focusing, which is characterized in that the automatic focusing method uses root According to the automatic focusing device of the atmospheric coherence length instrument automatic focusing described in any one of claim 1-4 or according to claim Atmospheric coherence length instrument described in 5, the automatic focusing method include:
Step 1:Take-up housing is imaged during mobile on the micro slide rail on the controller acquisition camera target surface The centroid position of two hot spots;
Step 2:Between the barycenter for calculating described two hot spots according to the centroid position for two hot spots being imaged on camera target surface Away from;
Step 3:The spacing of the barycenter and preset spacing are made into difference and obtain the absolute value of difference;
Step 4:Judge whether the absolute value of the difference is less than setting return difference;If it is, the take-up housing is not along described Micro slide rail moves;Otherwise step 5 is executed;
Step 5:Judge whether the spacing of the barycenter is more than the spacing of the setting;If it is, controller is placed in positive tune Coke-like state executes step 6;Otherwise, controller is placed in reversed focus state, executes step 7;
Step 6:It controls the take-up housing to focus along the micro slide rail forward direction, executes step 1;
Step 7:It controls the take-up housing reversely to focus along the micro slide rail, executes step 1.
CN201611178904.9A 2016-12-19 2016-12-19 Atmospheric coherence length instrument automatic focusing device and method Expired - Fee Related CN106443951B (en)

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CN110346046B (en) * 2019-07-15 2020-11-06 中国科学院合肥物质科学研究院 Day and night star radiometer automatic focusing method and radiometer system

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