CN103149014A - Device and method for detecting optical system visual axis shaking and focal length value - Google Patents

Abstract

Translated fromChinese

本发明涉及一种光学系统视轴晃动和焦距值的检测装置及检测方法，检测装置由视轴投影装置、光电探测器和时序控制单元组成，其中视轴投影装置由光源驱动与控制器、分划板、照明光源及准直镜组成；通过时序控制单元对视轴投影装置和光电探测器的进行同步控制，对有投影目标影像的当帧图像只记录不进行目标脱靶量提取，事后对该帧图像进行判读，实现对光学系统视轴位置和组合焦距值的检测；对没有投影目标影像的图像进行实时记录和目标脱靶量提取，送出脱靶量给伺服系统进行对目标自动跟踪。本发明解决了以往光电经纬仪在自动跟踪目标时，由于投影十字丝影像对目标脱靶量的提取影响，无法对光电经纬仪光学系统的视轴晃动和焦距变化进行检测的问题。

The present invention relates to a detection device and detection method for visual axis shaking and focal length value of an optical system. Composed of a scribing board, an illumination source and a collimating mirror; through the timing control unit, the boresight projection device and the photodetector are synchronously controlled, and the current frame image with the projected target image is only recorded without extracting the target miss amount. The frame image is interpreted to realize the detection of the visual axis position of the optical system and the combined focal length value; the image without the projected target image is recorded in real time and the amount of target miss is extracted, and the amount of miss is sent to the servo system for automatic tracking of the target. The invention solves the problem that in the past, when the photoelectric theodolite automatically tracks the target, it cannot detect the shake of the visual axis and the change of the focal length of the optical system of the photoelectric theodolite due to the influence of the projected cross-hair image on the extraction of the target miss amount.

Description

A kind of optical system optical axis rocks pick-up unit and the detection method with focal length value

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 opticalaxis projection arrangement 2,photodetector 3 and timing control unit 4, wherein opticalaxis projection arrangement 2 is driven withcontroller 5,graticule 6,lighting source 7 andcollimating mirror 8 by light source andforms.Differentiation plate 6 be the bright target of dark field, is breaking up the crosshair 9 that is carved with certain live width onplate 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.Opticalaxis projection arrangement 2 throws into tested optical system from the edge of electro-optic theodoliteoptical system 1, and thegraticule 6 in opticalaxis projection arrangement 2 can be imaged onto thephotodetector 3 that is fixed on electro-optic theodoliteoptical system 1 image planes.When target is carried out real-time follow-up, make opticalaxis projection arrangement 2 andphotodetector 3 by sequentially carrying out work with certain sequential control by timing control unit 4, realize thatgraticule 6 can be with certain interval of time imaging on photodetector 3.Time-sharing operation is carried out in the target image processing thatphotodetector 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 theodoliteoptical 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 thelighting source 7 in described opticalaxis projection arrangement 2 can be regulated, and guarantees projection target imaging clearly onphotodetector 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 opticalaxis projection arrangement 2,collimating mirror 8 is optical systems of the bore of a Φ 40mm, guarantee the final image quality ofgraticule 6, and reduces blocking electro-optic theodoliteoptical system 1 as far as possible.

Described timing control unit 4, whatguarantee lighting source 7 andphotodetector 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, andphotodetector 3 imagings stop.

Describedphotodetector 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 adjustinglighting source 7 brightness, makegraticule 6 to become the image of appropriate brightness to be beneficial to interpretation afterwards onphotodetector 3 from object space simulation infinite distance target projection to the electro-optic theodolite optical system by opticalaxis projection arrangement 2;

(2) makelighting source 7 andphotodetector 3 carry out work with certain sequential control by timing control unit 4, make thegraticule 6 can be with certain interval of time imaging onphotodetector 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 ofgraticule 6 images to carry out interpretation to note afterwards, the optical axis position of the intersection point ofgraticule 6 crosshair 9 images as electro-optic theodoliteoptical 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 theodoliteoptical 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 theodoliteoptical 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 opticalaxis projection arrangement 2,photodetector 3 and timing control unit 4, wherein opticalaxis projection arrangement 2 is driven withcontroller 5,graticule 6,lighting source 7 andcollimating mirror 8 by light source andforms.Differentiation plate 6 be the bright target of dark field, is breaking up the crosshair 9 that is carved with certain live width onplate 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.Opticalaxis projection arrangement 2 throws into tested optical system from the edge of electro-optic theodoliteoptical system 1, and thegraticule 6 in opticalaxis projection arrangement 2 can be imaged onto thephotodetector 3 that is fixed on electro-optic theodoliteoptical system 1 image planes.When target is carried out real-time follow-up, make opticalaxis projection arrangement 2 andphotodetector 3 by sequentially carrying out work with certain sequential control by timing control unit 4, realize thatgraticule 6 can be with certain interval of time imaging on photodetector 3.Time-sharing operation is carried out in the target image processing thatphotodetector 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 theodoliteoptical 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 oflighting source 7 is arranged to normal bright mode of operation withcontroller 5, opticalaxis projection arrangement 2 projects to electro-optic theodoliteoptical system 1 through collimatingmirror 8 from thegraticule 6 of object space simulation infinite distance, drive by adjusting light source the brightness that changeslighting source 7 with the electric current (or voltage) ofcontroller 5, makegraticule 6 to become the image of appropriate brightness onphotodetector 3, be beneficial to image interpretation afterwards;

(2) in the real-time follow-up task, the light source driving oflighting source 7 is arranged to trigger mode withcontroller 5, makelighting source 7 andphotodetector 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, andphotodetector 3 imagings stop.Finally, make thegraticule 6 can be with certain interval of time Δ T imaging onphotodetector 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 theodoliteoptical 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 theodoliteoptical system 1 this frame;

(5) electro-optic theodoliteoptical 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 ofgraticule 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 ofcontroller 7 by light source and controls, and makeslighting source 7 light when the arrival of time sequential pulse forward position, and the duration is pulse width; Another time sequential pulse is used forphotodetector 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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