CN103149014A - Detection device and detection method for visual axis shake and focal length value of optical system - Google Patents
Detection device and detection method for visual axis shake and focal length value of optical system Download PDFInfo
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- CN103149014A CN103149014A CN2013100489441A CN201310048944A CN103149014A CN 103149014 A CN103149014 A CN 103149014A CN 2013100489441 A CN2013100489441 A CN 2013100489441A CN 201310048944 A CN201310048944 A CN 201310048944A CN 103149014 A CN103149014 A CN 103149014A
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Abstract
The invention relates to a detection device and a detection method for visual axis shake and a focal length value of an optical system. The detection device consists of a visual axis projection device, a photoelectric detector and a time sequence control unit, wherein the visual axis projection device consists of a light source drive, a controller, a reticle, a lighting light source and a collimator mirror; the visual axis projection device and the photoelectric detector are synchronously controlled by the time sequence control unit; a current frame of image with a projection target image is only recorded and is not subjected to target miss distance extraction, and the frame of image is interpreted afterwards, so that detection of the visual axis position and the combined focal length value of the optical system is realized; and the image without the projection target image is recorded in real time and is subjected to the target miss distance extraction and the miss distance is transmitted to a servo system for performing automatic tracking of the target. According to the detection device and the detection method, the problem that the visual axis shake and the focal length variation of the optical system of a photoelectric theodolite cannot be detected during automatic target tracking of the conventional photoelectric theodolite due to influence of a projection cross hair image on extraction of the target miss distance is solved.
Description
Technical field
The present invention relates to a kind of optical system optical axis and rock pick-up unit and detection method with focal length value, make electro-optic theodolite when the real-time automatic tracking target, can rock with focal length variations the optical system optical axis in real time and carry out record, in order to improve electro-optic theodolite processing accuracy afterwards.
Background technology
Electro-optic theodolite is when carrying out tracking measurement to aerial target, due to the impact that is subject to gravity and light modulation in real time, focusing, make optical axis position and the combined focal length value of electro-optic theodolite optical system all corresponding variation can occur, and then have influence on the processing accuracy afterwards of measuring equipment.
In cinetheodollite in the past, the film pick-up machine only records metrical information, does not participate in target following.So just can adopt the crosshair target projection on film, by process the crosshair image on film afterwards, optical system optical axis position and combined focal length value be detected; Along with the application of photodetector, in electro-optic theodolite for satisfy to target from motion tracking, to the optical axis position of its optical system and the combined focal length value is not carried out in real time or quasi real time detection, just will change control as far as possible within the specific limits.
Along with the target range is more and more higher to the demand of electro-optic theodolite measuring accuracy, in order further to improve the measuring accuracy of electro-optic theodolite, to the optical axis position of its optical system and the combined focal length value is carried out in real time or quasi real time detection is necessary.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provide a kind of optical system optical axis to rock pick-up unit and method with focal length value, make electro-optic theodolite when the real-time automatic tracking target, optical axis position and the combined focal length of can be accurately real-time recording optically system change, in order to improve electro-optic theodolite processing accuracy afterwards.
The technical solution adopted for the present invention to solve the technical problems is: a kind of optical system optical axis rocks the pick-up unit with focal length value, be comprised of optical axis projection arrangement 2, photodetector 3 and timing control unit 4, wherein optical axis projection arrangement 2 is driven with controller 5, graticule 6, lighting source 7 and collimating mirror 8 by light source and forms.Differentiation plate 6 be the bright target of dark field, is breaking up the crosshair 9 that is carved with certain live width on plate 6, and the intersection point of crosshair 9 is as optical axis subpoint, is carved with two dash lines with the perpendicular line symmetry on crosshair 9 horizontal lines, as projection mark angle 10.Optical axis projection arrangement 2 throws into tested optical system from the edge of electro-optic theodolite optical system 1, and the graticule 6 in optical axis projection arrangement 2 can be imaged onto the photodetector 3 that is fixed on electro-optic theodolite optical system 1 image planes.When target is carried out real-time follow-up, make optical axis projection arrangement 2 and photodetector 3 by sequentially carrying out work with certain sequential control by timing control unit 4, realize that graticule 6 can be with certain interval of time imaging on photodetector 3.Time-sharing operation is carried out in the target image processing that photodetector 3 obtains, to not carrying out the target miss distance and extract when two field picture only recording of crosshair 9 images arranged, this two field picture is carried out interpretation afterwards, realize the detection to electro-optic theodolite optical system 1 optical axis position and combined focal length value; The image that there is no crosshair 9 images is carried out real time record and the extraction of target miss distance, send miss distance and carry out Automatic Target Tracking to servo-drive system.
The brightness of the lighting source 7 in described optical axis projection arrangement 2 can be regulated, and guarantees projection target imaging clearly on photodetector 3, is easy to interpretation; Lighting source 7 can and trigger two kinds of patterns and carry out work with Chang Liang simultaneously, and projection target throws light on.
In described optical axis projection arrangement 2, collimating mirror 8 is optical systems of the bore of a Φ 40mm, guarantee the final image quality of graticule 6, and reduces blocking electro-optic theodolite optical system 1 as far as possible.
Described timing control unit 4, what guarantee lighting source 7 and photodetector 2 can carry out work with the sequential as Fig. 4.When arrive in the time sequential pulse forward position, lighting source 7 is lighted, photodetector 3 beginning imagings; When after time sequential pulse, arrived in the edge, lighting source 7 extinguished, and photodetector 3 imagings stop.
Described photodetector 3 is area array CCD or cmos imaging device.
A kind of optical system optical axis rocks the detection method with focal length value, and performing step is as follows:
(1) 1, by adjusting lighting source 7 brightness, make graticule 6 to become the image of appropriate brightness to be beneficial to interpretation afterwards on photodetector 3 from object space simulation infinite distance target projection to the electro-optic theodolite optical system by optical axis projection arrangement 2;
(2) make lighting source 7 and photodetector 3 carry out work with certain sequential control by timing control unit 4, make the graticule 6 can be with certain interval of time imaging on photodetector 3;
(3) two field picture of working as that there is no graticule 6 images is carried out real time record and target miss distance extraction process, send miss distance and carry out automatically track target to servo-drive system, the two field picture of working as that graticule 6 images are arranged is only carried out real time record and do not carry out the target extraction process, and servo-drive system is processed by smooth pursuit and is continued to keep target following;
(4) there is the image of graticule 6 images to carry out interpretation to note afterwards, the optical axis position of the intersection point of graticule 6 crosshair 9 images as electro-optic theodolite optical system 1 this frame, the ratio of the line amount at projection mark angle 10 with the angle amount of demarcating in advance, as the combined focal length value of electro-optic theodolite optical system 1 this frame;
(5) optical axis position and the combined focal length value that obtain with detection as optical axis position and the combined focal length value of two two field picture interval all document images in the period that graticule 6 images are arranged, are carried out image interpretation and are processed.
The present invention's advantage compared with prior art is: the invention solves in the past electro-optic theodolite when automatically track target, due to the extraction impact of projection crosshair 9 images on the target miss distance, can't rock the problem that detects with focal length variations to the optical axis of electro-optic theodolite optical system 1, propose to solve electro-optic theodolite and can keep real-time automatic tracking to tracking target, again can be accurately real-time recording optically system's optical axis position and combined focal length change, and realize the electro-optic theodolite further raising of angle measurement accuracy afterwards.
Description of drawings
Fig. 1 is apparatus of the present invention schematic layout pattern:
Method realization flow figure in Fig. 2 the present invention;
Graticule schematic diagram in Fig. 3 the present invention;
Fig. 4 sequential control schematic diagram of the present invention.
Embodiment
As shown in Figure 1, the optical system optical axis of the present invention rocks the pick-up unit with focal length value, be comprised of optical axis projection arrangement 2, photodetector 3 and timing control unit 4, wherein optical axis projection arrangement 2 is driven with controller 5, graticule 6, lighting source 7 and collimating mirror 8 by light source and forms.Differentiation plate 6 be the bright target of dark field, is breaking up the crosshair 9 that is carved with certain live width on plate 6, and the intersection point of crosshair 9 is as optical axis subpoint, is carved with two dash lines with the perpendicular line symmetry on crosshair 9 horizontal lines, as projection mark angle 10.Optical axis projection arrangement 2 throws into tested optical system from the edge of electro-optic theodolite optical system 1, and the graticule 6 in optical axis projection arrangement 2 can be imaged onto the photodetector 3 that is fixed on electro-optic theodolite optical system 1 image planes.When target is carried out real-time follow-up, make optical axis projection arrangement 2 and photodetector 3 by sequentially carrying out work with certain sequential control by timing control unit 4, realize that graticule 6 can be with certain interval of time imaging on photodetector 3.Time-sharing operation is carried out in the target image processing that photodetector 3 obtains, to not carrying out the target miss distance and extract when two field picture only recording of crosshair 9 images arranged, this two field picture is carried out interpretation afterwards, realize the detection to electro-optic theodolite optical system 1 optical axis position and combined focal length value; The image that there is no crosshair 9 images is carried out real time record and the extraction of target miss distance, send miss distance and carry out Automatic Target Tracking to servo-drive system.
As shown in Figure 2, the optical system optical axis of the present invention rocks the detection method with focal length value, and concrete steps are as follows:
(1) before real-time task, the light source driving of lighting source 7 is arranged to normal bright mode of operation with controller 5, optical axis projection arrangement 2 projects to electro-optic theodolite optical system 1 through collimating mirror 8 from the graticule 6 of object space simulation infinite distance, drive by adjusting light source the brightness that changes lighting source 7 with the electric current (or voltage) of controller 5, make graticule 6 to become the image of appropriate brightness on photodetector 3, be beneficial to image interpretation afterwards;
(2) in the real-time follow-up task, the light source driving of lighting source 7 is arranged to trigger mode with controller 5, make lighting source 7 and photodetector 3 carry out work with the sequential control as Fig. 4 by timing control unit 4, when arrive in the time sequential pulse forward position, lighting source 7 is lighted, photodetector 3 beginning imagings; When after time sequential pulse, arrived in the edge, lighting source 7 extinguished, and photodetector 3 imagings stop.Finally, make the graticule 6 can be with certain interval of time Δ T imaging on photodetector 3;
(3) two field picture of working as that there is no graticule 6 images is carried out real time record and target miss distance extraction process, send miss distance and carry out automatically track target to servo-drive system, the two field picture of working as that graticule 6 images are arranged is only carried out real time record and do not carry out the target extraction process, and servo-drive system is processed by smooth pursuit and is continued to keep target following;
(4) after the real-time follow-up task is completed, there is the image of graticule 6 images to carry out interpretation to note, the optical axis position of the intersection point of graticule crosshair 9 images as electro-optic theodolite optical system 1 this frame, the ratio of the line amount at projection mark angle 10 with the angle amount of demarcating in advance, as the combined focal length value of electro-optic theodolite optical system 1 this frame;
(5) electro-optic theodolite optical system 1 optical axis position and the combined focal length value that obtain with detection, upper from optical axis position and combined focal length value that the nearest institute's document image of graticule 6 images is arranged as the time, carry out image interpretation.
As shown in Figure 3, graticule 6 is dark field, and crosshair 9 and projection mark angle 10 are bright target, and the groove edge is neat, 8 microns of width, the symmetrical perpendicular line with crosshair 9 of projection mark 10 liang, angle short-term.
As shown in Figure 4, timing control unit 4 produces two time sequential pulses, and a time sequential pulse drives with 5 pairs of lighting sources of controller 7 by light source and controls, and makes lighting source 7 light when the arrival of time sequential pulse forward position, and the duration is pulse width; Another time sequential pulse is used for photodetector 3 is controlled, photodetector 3 imagings when arrive in the time sequential pulse forward position, and the duration is pulse width; The forward position alignment of two time sequential pulses.
Instructions of the present invention does not elaborate the known technology that part belongs to those skilled in the art.
The above; only be the embodiment in the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; can understand conversion or the replacement expected, all should be encompassed in of the present invention comprise scope within.
Claims (6)
1. the optical system optical axis rocks the pick-up unit with focal length value, it is characterized in that: be comprised of optical axis projection arrangement (2), photodetector (3) and timing control unit (4), wherein optical axis projection arrangement (2) is driven with controller (5), graticule (6), lighting source (7) and collimating mirror (8) by light source and forms; Differentiation plate (6) is the bright target of dark field, be carved with the crosshair (9) of certain live width on differentiation plate (6), the intersection point of crosshair (9) is as optical axis subpoint, is carved with two dash lines with the perpendicular line symmetry on crosshair (9) horizontal line, as projection mark angle (10); Optical axis projection arrangement (2) throws into tested optical system from the edge of electro-optic theodolite optical system (1), and the graticule (6) in optical axis projection arrangement (2) is imaged onto the photodetector (3) that is fixed on electro-optic theodolite optical system (1) image planes; When target is carried out real-time follow-up, (4 make optical axis projection arrangement (2) and photodetector (3) by sequentially carrying out work with certain sequential control, realize that graticule (6) can be with certain interval of time in the upper imaging of photodetector (3) by timing control unit; Time-sharing operation is carried out in the target image processing that photodetector (3) obtains, to not carrying out the target miss distance and extract when two field picture only recording of crosshair (9) image arranged, this two field picture is carried out interpretation afterwards, realize the detection to electro-optic theodolite optical system (1) optical axis position and combined focal length value; The image that there is no crosshair (9) image is carried out real time record and the extraction of target miss distance, send miss distance and carry out Automatic Target Tracking to servo-drive system.
2. the optical system optical axis according to claim 1 rocks the pick-up unit with focal length value, and it is characterized in that: the brightness of described lighting source (7) can be regulated, and guarantees that projection target at the upper imaging clearly of photodetector (3), is easy to interpretation; Lighting source (7) can and trigger two kinds of patterns and carry out work with Chang Liang simultaneously, and projection target throws light on.
3. the optical system optical axis according to claim 1 rocks the pick-up unit with focal length value, it is characterized in that: described collimating mirror (8) is the optical system of the bore of a diameter of phi 40mm, guarantee the final image quality of graticule (6), and reduce blocking electro-optic theodolite optical system (1) as far as possible.
4. the optical system optical axis according to claim 1 rocks the pick-up unit with focal length value, it is characterized in that: when described timing control unit (4) guarantees that lighting source (7) and photodetector (2) can make the arrival of time sequential pulse forward position, lighting source (7) is lighted, photodetector (3) beginning imaging; When after time sequential pulse, arrived in the edge, lighting source (7) extinguished, and photodetector (3) imaging stops.
5. the optical system optical axis according to claim 1 rocks the pick-up unit with focal length value, and it is characterized in that: described photodetector (3) is area array CCD or cmos imaging device.
6. the optical system optical axis rocks the detection method with focal length value, it is characterized in that performing step is as follows:
The first step, simulate the infinite distance target projection by optical axis projection arrangement (2) to electro-optic theodolite optical system (1) from object space, by adjusting lighting source (7) brightness, make graticule (6) to become the image of appropriate brightness to be beneficial to interpretation afterwards on photodetector (3);
Second step makes lighting source 7 by timing control unit (4)) and photodetector (3) can carry out work with certain sequential control, make the graticule (6) can be with certain interval of time in the upper imaging of photodetector (3);
The 3rd step, the two field picture of working as that there is no graticule (6) image is carried out real time record and target miss distance extraction process, send miss distance and carry out automatically track target to servo-drive system, the two field picture of working as that graticule (6) image is arranged is only carried out real time record and do not carry out the target extraction process, and servo-drive system is processed by smooth pursuit and is continued to keep target following;
The 4th step, there is the image of graticule (6) image to carry out interpretation to note afterwards, the optical axis position of the intersection point of graticule (6) crosshair (9) image as this frame of electro-optic theodolite optical system (1), the ratio of the line amount at projection mark angle (10) with the angle amount of demarcating in advance, as the combined focal length value of this frame of electro-optic theodolite optical system (1).
In the 5th step, with optical axis position and the combined focal length value that detection obtains, as optical axis position and the combined focal length value of all document images in the two two field picture interval periods that graticule (6) image is arranged, carry out image interpretation and process.
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Cited By (3)
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| RU2691633C1 (en) * | 2015-11-25 | 2019-06-17 | Кумонос Корпорэйшн | Optical device, a sieve network of threads into the optical device, and a reconnaissance method using an optical device |
| CN111238412A (en) * | 2020-02-14 | 2020-06-05 | 天津时空经纬测控技术有限公司 | Measuring method, system and storage medium |
| CN113375651A (en) * | 2021-06-11 | 2021-09-10 | 中国科学院光电技术研究所 | Real-time synthesizer of photoelectric theodolite formation of image tracking information |
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