CN101231343B - Apparatus for measuring parallelism of laser rangefinder sighting and receiving axes based on liquid crystal modulation - Google Patents
Apparatus for measuring parallelism of laser rangefinder sighting and receiving axes based on liquid crystal modulation Download PDFInfo
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- CN101231343B CN101231343B CN2008100578995A CN200810057899A CN101231343B CN 101231343 B CN101231343 B CN 101231343B CN 2008100578995 A CN2008100578995 A CN 2008100578995A CN 200810057899 A CN200810057899 A CN 200810057899A CN 101231343 B CN101231343 B CN 101231343B
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Abstract
The invention relates to a device for measuring parallelism of sight axis and reception axis of a laser range finder based on liquid crystal modulation, which belongs to the technical field of optical precision measurement. The device comprises an off-axis parabolic mirror, a liquid crystal spatial light modulator, an integrating sphere, a visible light source, an optical fiber A, a laser delay module, an optical fiber B and a coupler, wherein the liquid crystal spatial light modulator is disposed on the focal plane of the off-axis parabolic mirror; the liquid crystal spatial light modulator, the integrating sphere, the optical fiber A, the laser delay module, the optical fiber B and the coupler are sequentially disposed behind the focal plane, and the coupler is connected with a laser emitter; and the visible light source is connected with the integrating sphere. The detection device uses the liquid crystal to perform electro-optical modulation to generate surface target for optoelectronic scanning. The invention can be used for rapid detection of the parallelism of sight axis and reception axis of the laser range finder in both indoor and outdoor environments; and has the advantages of high measurement success ratio, high precision and portability.
Description
Technical field
The present invention is a kind of laser rangefinder sighting and receiving axes apparatus for measuring parallelism based on liquid crystal modulation, and it can be used for laser rangefinder sighting axle and the receiving axes collimation fast detecting under indoor, outdoor environment, belongs to technical field of optical precision measurement.
Technical background
Pulse laser range finder measuring accuracy height, operating distance is far away, antijamming capability is strong, has been used for multiple field in a large number.For range finder using laser, its Specifeca tion speeification has the angle of divergence, energy, pulse width, transmission frequency (for the Repetition Frequency Laser device), accurate survey rate, false alarm rate, angular resolution, range resolution and three (aiming optical axis, emission optical axis, reception optical axis) collimations etc.Wherein performance index such as the angle of divergence, energy, pulse width do not have bigger change generally speaking, and at present these parameters are had good, general method of testing.During but three-axle parallel difference, range finder using laser are used, often cause the optical axis imbalance under transportation and field condition; And the test of environment such as the high low temperature of experience, vibration, impact also might cause variation in development and evaluation.Performance parameters such as accurate survey rate of the not parallel direct influence of optical axis and distance accuracy, and then influence the range capability of range finder, can not find range when serious.Therefore, three-axle parallel is a very important parameter weighing the range finder using laser performance.
It is reported, up to the present, no matter be development side, production plant or product tested detect and actual user, all do not find gratifying solution for the test of range finder using laser three-axle parallel.Wherein, for the test of receiving axes and guidance axis collimation, following three kinds of methods are arranged usually.
Carry out product when debuging in factory, usually adopt following method: place a preset lens in measured laser range finder the place ahead, at first tested range finder loam cake to be opened, remove pick-up probe, receive the aperture in the place ahead, visual field with the miniature bulb illumination, see through tested range finder object lens by preset lens then and observe the graduation cross curve in the aiming light path and the aperture of illumination, see whether both overlap, measure the two-dimentional deviation between guidance axis and the receiving axes.Because the position of focal plane of aperture is by the near-infrared wavelength optical design, with graduation groove in the aiming light path not on same focal plane, therefore the aperture in preset lens observation becomes disc of confusion, influences measurement accuracy.And range finder can only be by adjusting after professional and technical personnel's dismounting, particularly to through the range finder of high fever and salt fog test take apart loam cake test again very inconvenient, be difficult to guarantee to dispatch from the factory the range finder good state, under the environment of nonproductive factory, can not carry out this check.
In product export check and range test, adopt the repeatedly survey distance-finding method that T shape target is set at 1000 meters to detect usually.It is bigger that this method is influenced by external environmental interference, and precision is not high yet.
Under the prerequisite of not dismantling range finder, in order to improve measuring accuracy and speed, Beijing Institute of Technology's design proposes " utilizing the device of optical fiber measurement range finder using laser receiving axes and guidance axis collimation " (Chinese patent, grant number: ZL200410087249.7).But because this method uses point target to carry out two-dimensional scan, and the corresponding point of tested range finder receiving axes on focal plane are also very little, and both are difficult to overlap, so measuring process is complicated.And because this device has adopted dynamo-electric scanning, the precision of mechanical part is difficult to guarantee under the environment that is shaken.
Summary of the invention
The objective of the invention is for a kind of laser rangefinder sighting and receiving axes apparatus for measuring parallelism based on the liquid crystal modulation is provided, follow procedure changes the pixel coordinate of the image of LCD space light modulator demonstration, realizes the change in location of scanning patter at the focal plane of off axis paraboloidal mirror.There is not mechanical displacement means in this pick-up unit optical system, can realize optoelectronic scanning fast, it is very little to be affected by the external environment, in addition, this pick-up unit adopts the appearance mark to replace point target to scan, measurement success ratio height under the situation of not dismantling range finder using laser, can be realized laser rangefinder sighting axle and the receiving axes collimation fast detecting under indoor, outdoor environment.
The objective of the invention is to be achieved through the following technical solutions:
Laser rangefinder sighting and receiving axes apparatus for measuring parallelism based on the liquid crystal modulation of the present invention comprises off-axis parabolic mirror, and the LCD space light modulator that is positioned at focal plane, also comprise the integrating sphere, optical fiber a, laser time delay module, optical fiber b, the coupling mechanism that connect successively, also comprise the visible light source that is connected with integrating sphere.
Visible light source wherein can be LED, also can be ordinary light source.
Wherein LCD space light modulator is made up of polaroid a, liquid crystal cell, polaroid b, and wherein polaroid a, polaroid b are the polaroid of work spectral range from the visible light to the near infrared light.
Step based on LCD space light modulator Laser Measurement range finder guidance axis and receiving axes collimation method of the present invention is: at first LCD space light modulator is with the gray scale of certain its each pixel of programmed control, follow procedure changes the pixel coordinate of the boundary scan figure of LCD space light modulator demonstration under the lasing area light illumination in integrating sphere exit, realizes the different boundary scan figure sequence of coordinate position; Laser boundary scan figure is after the off-axis parabolic mirror reflection then, and the laser pickoff reception by range finder using laser by analyzing the range finding result of range finder using laser, generates the measurement result sequence of corresponding scanning boundary position coordinates; Calculate according to the measurement result sequence at last, obtain range finder using laser receiving axes current position coordinates, relatively obtain the parallel misalignment of receiving axes and guidance axis with laser rangefinder sighting shaft position coordinate.
The present invention contrasts prior art and has following remarkable advantage:
1. first LCD space light modulator is applied to laser rangefinder sighting axle and receiving axes collimation fast detecting.
2. utilize LCD space light modulator on two dimensional surface, to carry out optoelectronic scanning by appearance mark, compare on two dimensional surface by point target dynamo-electric scan method more quick and precisely.
3. do not have mechanical displacement means in the pick-up unit optical system, significantly improved the measuring speed and the serviceable life of instrument, reduced the external environment condition requirement when instrument uses.
4. measuring process can be fully by computer control and result of calculation, and the fast objectivity of test speed is good.
Description of drawings
Fig. 1 is laser rangefinder sighting and the receiving axes apparatus for measuring parallelism synoptic diagram based on the liquid crystal modulation;
Fig. 2 is the structural representation of LCD space light modulator;
Fig. 3 carries out the synoptic diagram of horizon scan for LCD space light modulator;
Fig. 4 is the searching algorithm synoptic diagram of laser pick-off axle corresponding point on focal plane;
Among the figure: the 1-off-axis parabolic mirror, the 2-LCD space light modulator, the 3-focal plane, the 4-integrating sphere, the 5-visible light source, 6-optical fiber a, 7-laser time delay module, 8-optical fiber b, the 9-coupling mechanism, the 10-range finder using laser, the 11-alignment clamp, the 12-guidance axis, 13-laser pick-off axle, the 14-laser pickoff, the 15-generating laser, 16-polaroid a, the 17-liquid crystal cell, 18-polaroid b, 19-liquid crystal scanning boundary, 20-receiving axes center corresponding point, 21-searches for origin coordinates, 22-laser pick-off axle focal plane coordinate.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Basic thought of the present invention is to utilize the liquid crystal of high resolving power, little pixel dimension to carry out photoelectricity modulation fast, under the even laser lighting of integrating sphere, form the appearance mark of the sequence of test usefulness, computing machine calculates laser rangefinder sighting axle and receiving axes collimation according to the image of sequence appearance mark correspondence and the range finding result of range finder.
The core thinking of test mainly in two steps, at first be to obtain the correspondence position of laser rangefinder sighting axle 12 on the focal plane 3 of off-axis parabolic mirror 1, be to obtain the correspondence position of laser pick-off axle 13 on focal plane 3 then, can be by comparing the parallel misalignment that the two position on focal plane 3 directly calculates laser rangefinder sighting axle 12 and receiving axes 13.
Embodiment
As shown in Figure 1, laser rangefinder sighting and the receiving axes apparatus for measuring parallelism based on the liquid crystal modulation of the present invention comprises: off-axis parabolic mirror 1, LCD space light modulator 2, integrating sphere 4, visible light source 5, optical fiber a6, laser time delay module 7, optical fiber b8, coupling mechanism 9.Described LCD space light modulator 2 places on the focal plane 3 of off-axis parabolic mirror 1; After described LCD space light modulator 2, integrating sphere 4, optical fiber a6, laser time delay module 7, optical fiber b8, coupling mechanism 9 were placed on focal plane 3 successively, coupling mechanism 9 was connected with generating laser 15; Described visible light source 5 is connected with integrating sphere 4.
LCD space light modulator 2, integrating sphere 4, visible light source 5 are used to generate visible images, and visible light source 5 wherein adopts LED, forms the visible light backlight of LCD space light modulator.
Integrating sphere 4, optical fiber a6, laser time delay module 7, optical fiber b8, coupling mechanism 9, the laser spots light source that is used for coming through Optical Fiber Transmission is converted to uniform lasing area light source, forms the laser backlight of LCD space light modulator.
LCD space light modulator 2 is made up of polaroid a16, liquid crystal cell 17, polaroid b18, and wherein polaroid a16, polaroid b18 are the polaroid of work spectral range from the visible light to the near infrared light.
Comprise also that wherein measured laser range finder 10 is positioned over off-axis parabolic mirror 1 dead ahead, behind focal plane 3, place LCD space light modulator 2, integrating sphere 4, optical fiber a6, laser time delay module 7, optical fiber b8, coupling mechanism 9 successively, coupling mechanism 9 is connected with generating laser 15, and visible light source 5 is connected with integrating sphere 4.
Testing procedure is as follows:
At first be to obtain the correspondence position of laser rangefinder sighting axle 12 on focal plane 3: light visible light source 5, integrating sphere 4 forms uniform area light source, on LCD space light modulator 2, show alignment image, alignment image enters range finder alignment clamp 11 through off-axis parabolic mirror 1 reflection, range finder alignment clamp 11 is aimed at, can obtain the respective pixel coordinate of guidance axis 12 on focal plane behind the aligning, pixel coordinate takes advantage of pixel size can obtain the correspondence position of guidance axis 12 on focal plane.
Be to obtain the correspondence position of laser pick-off axle 13 on focal plane 3 then: searching method as shown in Figure 3, at first control the edge of a knife image that LCD space light modulator 2 shows high contrast, edge of a knife image is after off-axis parabolic mirror 1 reflection, laser pickoff 14 by range finder using laser receives, by analyzing the ranging data of range finder using laser, can analyze which side of receiving axes center corresponding point 20 at scanning boundary 19, then regulate the horizontal coordinate of the scanning boundary 19 of liquid crystal edge of a knife image, generate the edge of a knife image on the new coordinate position according to this result.Repeatedly repeat above step, form the measurement result sequence, constantly regulate the coordinate of scanning boundary 19, realize boundary scan according to the measurement result sequence, receiving axes center corresponding point 20 and scanning boundary 19 are constantly approached until overlapping, promptly drawn the horizontal coordinate of receiving axes center corresponding point 20.Concrete boundary scan algorithm is as shown in Figure 4: the initial search origin coordinates 21 of hypothetical boundary is 0, laser pick-off axle focal plane coordinate 22 is 458, the photoelectricity edge of a knife that utilizes liquid crystal to generate so blocks the even lasing area of integrating sphere 4, use dichotomy to scan in whole liquid crystal measurement range, be under 1024 the situation in resolution, no more than 10 scannings just can draw the focal plane coordinate 22 of laser pick-off axle correspondence on the horizontal direction, and pixel coordinate takes advantage of pixel size can obtain the horizontal level coordinate of receiving axes 13 correspondence on focal plane.The horizontal edge of a knife is replaced by the vertical edge of a knife, and making uses the same method scans the upright position coordinate that can obtain receiving axes 13 correspondence on focal plane in vertical direction.And because guidance axis 12 is generally very little with the deviation of receiving axes 13, therefore only need reduce search area thus searching the corresponding point of receiving axes 13 on focal plane 3 near the position coordinates of guidance axis 12, scanning times also can significantly reduce.
Behind the position coordinates that obtains guidance axis 12 and receiving axes 13 respectively, both subtract each other, and can calculate the collimation of laser rangefinder sighting axle 12 and receiving axes 13 again according to optical system parameter.
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described; but these explanations can not be understood that to have limited scope of the present invention; protection scope of the present invention is limited by the claims of enclosing, and the change on any external claim of the present invention basis all is protection scope of the present invention.
Claims (5)
1. based on the laser rangefinder sighting and the receiving axes apparatus for measuring parallelism of liquid crystal modulation, it is characterized in that comprising: off-axis parabolic mirror (1), LCD space light modulator (2), integrating sphere (4), visible light source (5), optical fiber a (6), laser time delay module (7), optical fiber b (8), coupling mechanism (9); Described LCD space light modulator (2) places on the focal plane (3) of off-axis parabolic mirror (1); After described LCD space light modulator (2), integrating sphere (4), optical fiber a (6), laser time delay module (7), optical fiber b (8), coupling mechanism (9) were placed on focal plane (3) successively, coupling mechanism (9) was connected with generating laser (15); Described visible light source (5) is connected with integrating sphere (4).
2. according to right 1 described laser rangefinder sighting and receiving axes apparatus for measuring parallelism based on the liquid crystal modulation, it is characterized in that: comprise LCD space light modulator (2), integrating sphere (4), visible light source (5), be used to generate visible images, visible light source wherein (5) can be LED, also can be ordinary light source, form the backlight of LCD space light modulator.
3. according to right 1 described laser rangefinder sighting and receiving axes apparatus for measuring parallelism based on the liquid crystal modulation, it is characterized in that: comprise integrating sphere (4), optical fiber a (6), laser time delay module (7), optical fiber b (8), coupling mechanism (9), be used for and be converted to uniform lasing area light source through the laser spots light source that Optical Fiber Transmission is come, form the backlight of LCD space light modulator.
4. according to right 1 described laser rangefinder sighting and receiving axes apparatus for measuring parallelism based on the liquid crystal modulation, it is characterized in that: LCD space light modulator (2) is made up of polaroid a (16), liquid crystal cell (17), polaroid b (18), and wherein polaroid a (16), polaroid b (18) are the polaroid of work spectral range from the visible light to the near infrared light.
5. based on the method for LCD space light modulator Laser Measurement range finder guidance axis and receiving axes collimation, it is characterized in that: at first LCD space light modulator (2) is with the gray scale of certain its each pixel of programmed control, follow procedure changes the pixel coordinate of the boundary scan figure of LCD space light modulator demonstration under the lasing area light illumination in integrating sphere (4) exit, realizes the different boundary scan figure sequence of coordinate position; Laser boundary scan figure is after off-axis parabolic mirror (1) reflection then, and laser pickoff (14) reception by range finder using laser by analyzing the range finding result of range finder using laser, generates the measurement result sequence of corresponding scanning boundary position coordinates; Calculate according to the measurement result sequence at last, obtain range finder using laser receiving axes (13) current position coordinates, relatively obtain the parallel misalignment of receiving axes (13) and guidance axis (12) with laser rangefinder sighting axle (12) position coordinates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100578995A CN101231343B (en) | 2008-02-20 | 2008-02-20 | Apparatus for measuring parallelism of laser rangefinder sighting and receiving axes based on liquid crystal modulation |
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| CN2008100578995A CN101231343B (en) | 2008-02-20 | 2008-02-20 | Apparatus for measuring parallelism of laser rangefinder sighting and receiving axes based on liquid crystal modulation |
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| CN101231343A CN101231343A (en) | 2008-07-30 |
| CN101231343B true CN101231343B (en) | 2010-12-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101793508A (en) * | 2010-03-23 | 2010-08-04 | 长春理工大学 | Device for measuring parallelism of transmission shaft and receiving shaft of laser distance measuring equipment based on focal plane scanning |
| CN102072771A (en) * | 2010-10-21 | 2011-05-25 | 富美科技有限公司 | Gray value testing system based on computer |
| CN103186015B (en) * | 2011-12-28 | 2015-12-16 | 天津市亚安科技股份有限公司 | Video camera night-vision illumination system and control method thereof |
| CN102944942A (en) * | 2012-11-26 | 2013-02-27 | 中国科学院长春光学精密机械与物理研究所 | Laser uniform area light source |
| EP2937665B1 (en) * | 2014-04-23 | 2021-06-16 | Hexagon Technology Center GmbH | Distance measuring module with a variable optical attenuation unit from an LC cell |
| CN105044704B (en) * | 2015-07-24 | 2017-08-29 | 北京空间机电研究所 | The spaceborne laser transmitter integrated test system for performance of high accuracy |
| FR3046251B1 (en) * | 2015-12-29 | 2017-12-22 | Thales Sa | METHOD AND SYSTEM FOR IMAGEUR TELEMETRY |
| CN105974579B (en) * | 2016-07-18 | 2018-03-02 | 西安交通大学 | Angle altering arrangement based on off axis paraboloidal mirror heavy caliber collimated light beam |
| CN106249427B (en) * | 2016-08-31 | 2018-11-20 | 河北汉光重工有限责任公司 | A kind of optic axis adjusting method based on laser imaging |
| CN111010231B (en) * | 2019-12-23 | 2022-05-03 | 网络通信与安全紫金山实验室 | Free space optical communication method and system |
| CN112556579A (en) * | 2020-12-25 | 2021-03-26 | 深圳市中图仪器股份有限公司 | Six-degree-of-freedom space coordinate position and attitude measuring device |
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