CN101846528A - Detection method for capture capability of photoelectric tracking equipment to target with low contrast - Google Patents
Detection method for capture capability of photoelectric tracking equipment to target with low contrast Download PDFInfo
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- CN101846528A CN101846528A CN 201010144808 CN201010144808A CN101846528A CN 101846528 A CN101846528 A CN 101846528A CN 201010144808 CN201010144808 CN 201010144808 CN 201010144808 A CN201010144808 A CN 201010144808A CN 101846528 A CN101846528 A CN 101846528A
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Abstract
The invention relates to a detection method for the capture capability of photoelectric tracking equipment to a target with low contrast. The method comprises the following steps of: mounting a target on a focal plane of a collimation objective between a target integrating sphere and a background integrating sphere; adjusting the light flux of an external light source entering the background integrating sphere until a radiance value measured by a spectrum radiance meter reaches set background brightness; adjusting the light flux of the external light source entering the target integrating sphere until a radiance value measured by a spectrum radiance meter reaches set target brightness; and aligning an optical system of the photoelectric tracking equipment to be detected with the collimation objective and continuously changing target and background contrast until a target with the minimum contrast can be captured by the photoelectric tracking equipment. By the invention, the radiance of the target integrating sphere can be continuously changed to obtain different kinds of target and background contrast. The invention provides an optical measurable accurate reference for detecting the capture capability of the photoelectric tracking equipment to a target with low contrast.
Description
Technical field
The present invention relates to a kind of optical instrument detection method, particularly a kind of photoelectric tracking measuring equipment is to the method for inspection of low contrast target acquistion ability.
Background technology
The photoelectric tracking measuring equipment is used for realizing a certain moving target (target of advancing as the target and the ground of sky flight) is carried out from motion tracking and position measurement.The tracking range that the photoelectric tracking measuring equipment can reach and the instrument performances such as stability of tracing process are relevant with the target contrast of being followed the tracks of, when target contrast is very low, the photoelectric tracking measuring equipment can't detect the existence of target, the ability drop that perhaps can detect target but catch, thereby the stability that influence is followed the tracks of.Therefore the photoelectric tracking measuring equipment is to the important indicator (hereinafter to be referred as the target contrast index) that recognition capability is an outfit of equipment of catching of low contrast target, and it directly influences the tracking performance and the tracking range of photoelectric tracking measuring equipment.Generally to the target contrast index request of photoelectric tracking measuring equipment television system for being better than 3%.
Research and test-target contrast index are in order to investigate detection and the capture ability of television system to weak echo signal.The factor that influences target contrast has many aspects such as the signal to noise ratio (S/N ratio), image processing algorithm of the image quality of optical lens, transmitance, parasitic light coefficient, system.The verification method of laboratory use at present is the analog electrical signal that utilizes a known signal to noise ratio (S/N ratio), can the Direct Test image processor catch this signal, this checking does not comprise the influence to target contrast of optical system, TV sensor and circuit noise signal, the overall performance that can not truly reflect television system, this in addition method can not the check digit signal television system.
The portable adjustable contrast target of bibliographical information source is arranged, be used for checking the minimum distinguishable contrast of optical lens, it adopts two overlap integral balls, test target (target is the spatial frequency plate) is placed in the middle of two integrating spheres, with the mode of a lighting source by beam split is two integrating spheres illuminations, brightness and target contrast that voltage by adjusting power supply and attenuator change two integrating spheres.
This device is used for checking the minimum distinguishable contrast of small-sized visual optical camera lens, and the brightness of illumination of two integrating spheres is very low, and high-high brightness can only reach 200cd/m
2, and check needs high-high brightness (about 8000cd/m of simulation sky during optoelectronic device
2), therefore the principle of this device can not satisfy our demand.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of spoke brightness that can regulate background and target continuously, thereby accurately detects the method for inspection of the electro-optical tracking device of electro-optical tracking device capture ability to low contrast target acquistion ability.
In order to solve the problems of the technologies described above, electro-optical tracking device of the present invention comprises the steps: the method for inspection of low contrast target acquistion ability
Target is installed between target integrating sphere and the background integrating sphere, and is located on the focal plane of collimator objective;
Open built-in light source and external light source on the background integrating sphere;
The diaphragm of regulating on the background integrating sphere is controlled the luminous flux that external light source enters background integrating sphere, and the spoke brightness value of background integrating sphere is changed continuously, reaches the background luminance N of setting until the spoke brightness value of spectral radiance meter measurement
0
Open the external light source on the target integrating sphere, target is thrown light on;
Regulate the luminous flux of the diaphragm control target approach integrating sphere on the target integrating sphere, the spoke brightness value is changed continuously, reach the object brightness N of setting until the spoke brightness value of spectral radiance meter measurement
1
Calculate the contrast C of target and background:
Make tested electro-optical tracking device optical system aim at collimator objective, to target imaging, check the trapped state of this electro-optical tracking device to this known contrast target, adjust the clear aperture of diaphragm on the target integrating sphere repeatedly, continuously change the contrast of target and background, can capture contrast target hour until this electro-optical tracking device; At this moment, the contrast value of target and background is the actual test value of this electro-optical tracking device to low contrast target acquistion recognition capability.
The present invention controls the luminous flux that external light source enters background integrating sphere by the clear aperture of regulating diaphragm, continuously change the spoke brightness of background integrating sphere, can simulate the brightness of any time sky background, and control the luminous flux of external light source target approach integrating sphere by the clear aperture of regulating diaphragm, continuously change the spoke brightness of target integrating sphere, thereby obtain the different targets and the contrast of background, realized the continuous variation of contrast, for the check electro-optical tracking device provides optics measurable accurate benchmark to low contrast target acquistion ability.
External light source on built-in light source on the described background integrating sphere and external light source, the target integrating sphere all adopts the power supply of accurate control power supply, with the stability of the spectral radiance that guarantees two integrating spheres.
Described external light source adopts Halogen lamp LED, and this Halogen lamp LED is positioned on the focus of parabolic lens.
Because Halogen lamp LED all is two-sided cosine radiator, filament is not directly incident in the integrating sphere through parabolic lens optically focused towards a side beam of integrating sphere, can enter the cone angle of integrating sphere by the distance control scattered light of control parabolic lens and integrating sphere, light can not be directly incident on the receiver.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is for realizing the apparatus structure synoptic diagram of electro-optical tracking device of the present invention to the method for inspection of low contrast target acquistion ability.
Embodiment
As shown in Figure 1, realize that electro-optical tracking device comprises background integrating sphere 1, target integrating sphere 2, target 3 and collimator objective 4 to the device of low contrast target acquistion ability test method.Target 3 and collimator objective 4 are fixedly mounted on the background integrating sphere 1; 15,4 external light sources 11 of 14,10 built-in light sources of spectral radiance meter and 4 diaphragms 12 also are installed on the background integrating sphere 1.24,1 external light source 21 of spectral radiance meter and 1 diaphragm 22 are installed on the target integrating sphere 2.Target 3 and is positioned on the focal plane of collimator objective 4 between target integrating sphere and background integrating sphere.
Described built-in light source 15 and external light source 11,21 all adopt the power supply of accurate control power supply.
Described external light source 11,21 adopts Halogen lamp LEDs, and external light source 11 is positioned on the focus with the corresponding parabolic lens 13 in its position, and external light source 21 is positioned on the focus with the corresponding parabolic lens 23 in its position.
Background integrating sphere adopts ten built-in light sources, four external light sources, the stability that in use keeps all source current voltages is opened built-in light source 15 and external light source 11 on the background integrating sphere 1, and the light that external light source 11 sends enters background integrating sphere 1 by diaphragm 12; Adjust diaphragm and control the luminous flux of external light source, when the luminous flux adjustment amount is equivalent to the luminous flux of a built-in light source, close a built-in light source, readjust the diaphragm clear aperture again, the spoke brightness of background integrating sphere can be changed continuously, do not produce step, reach the background luminance N of setting until the spoke brightness value of spectral radiance meter measurement
0, background integrating sphere can be simulated the brightness of any time sky background like this.
Open the external light source on the target integrating sphere, target is thrown light on;
Regulate the luminous flux of the diaphragm control target approach integrating sphere on the target integrating sphere, the spoke brightness value is changed continuously, reach the object brightness N of setting until the spoke brightness value of spectral radiance meter measurement
1
Calculate the contrast C of target and background:
Make tested electro-optical tracking device optical system aim at collimator objective, to target imaging, check the trapped state of this electro-optical tracking device to this known contrast target, adjust the clear aperture of diaphragm on the target integrating sphere repeatedly, continuously change the contrast of target and background, can capture contrast target hour until this electro-optical tracking device; At this moment, the contrast value of target and background is the actual test value of this electro-optical tracking device to low contrast target acquistion recognition capability.
The brightness of background changes should satisfy the variation range in daytime at early morning to dusk, and high-high brightness should reach the brightness of this day in Summer Solstice sky during 70 ° of sun altitudes.The variation range of target contrast mainly should satisfy the demand of low contrast test, 0～20% target contrast is the most frequently used scope, the variation range of object brightness and the high-high brightness that can reach and background are approaching, target should be the infinite distance target, can satisfy the test of clear aperature 250mm with inner optical system.
The background integrating sphere illumination has dual mode: promptly adopt built-in light source and external light illumination.
External light illumination is adopted in the illumination of target integrating sphere.
Adopt the mode of external light illumination will consider how to utilize the luminous flux of light source.By external light source being placed on the focus of parabolic lens, the divergent beams that light source is sent become parallel beam and shine on the integrating sphere inwall, by adjusting the luminous flux that the control of diaphragm clear aperture enters integrating sphere, the lighting source luminous flux can be fully utilized like this, and light source heat radiation and integrating sphere spoke brightness adjustment simultaneously all realizes easily.The manufacturing cost height but this external light source is compared with built-in light source will make integrating sphere reach the quantity that the brightness of identical spectra spoke will increase lighting source, has also increased the quantity of control power supply simultaneously.Background integrating sphere adopts ten built-in light sources, four external light sources, the stability that in use keeps all source current voltages, adjust diaphragm and control the luminous flux of external light source, when the luminous flux adjustment amount is equivalent to the luminous flux of a built-in light source, close a built-in light source, readjust the diaphragm clear aperture again, the spoke brightness of integrating sphere can be changed continuously, do not produce step, thereby obtain the target of any contrast.
For integrating sphere, we need not have in detector plane and the imaging viewing field light of direct projection, because according to the integrating sphere principle, the brightness of having only diffuse light to form in integrating sphere is only uniformly, have only brightness measured when all being diffuse light could represent the interior brightness of imaging viewing field on the detector receiving plane, either party has the incident of direct projection light, all will make the result of measurement and actual value produce very big departing from, thereby brings error for the contrast measurement.To external light source, because Halogen lamp LED all is two-sided cosine radiator, filament is not directly incident in the integrating sphere through parabolic lens optically focused towards a side beam of integrating sphere, should make this part light minimum as far as possible, distance by control parabolic lens and integrating sphere is controlled the cone angle that scattered light enters integrating sphere, and light can not be directly incident on the receiver.
Guarantee the stability of the spectral radiance of two integrating spheres, at first just require to use luminous stable light source, we select Halogen lamp LED as lighting source, adopting precision 0.3 ‰ constant current constant voltage power supplys is the lighting source power supply, experimental results show that this measure can guarantee that the stability of the spectral radiance of two integrating spheres reaches 1 ‰; Two spectral radiance instrumentations of its less important assurance amount result's consistance and repeatability, the spectrum width of cloth nitometer lasting accuracy of selection is better than 5 ‰, can satisfy the measurement requirement of contrast 1% lasting accuracy.
The invention is not restricted to above-mentioned embodiment, the quantity of the external light source on the target integrating sphere, the built-in light source on the background integrating sphere and external light source can be selected according to the requirement of light source power and the required spectral radiance of integrating sphere.
Claims (3)
1. an electro-optical tracking device is characterized in that comprising the steps: to the method for inspection of low contrast target acquistion ability
Target is installed between target integrating sphere and the background integrating sphere, and is located on the focal plane of collimator objective;
Open built-in light source and external light source on the background integrating sphere;
The diaphragm of regulating on the background integrating sphere is controlled the luminous flux that external light source enters background integrating sphere, and the spoke brightness value of background integrating sphere is changed continuously, reaches the background luminance N of setting until the spoke brightness value of spectral radiance meter measurement
0
Open the external light source on the target integrating sphere, target is thrown light on;
Regulate the luminous flux of the diaphragm control target approach integrating sphere on the target integrating sphere, the spoke brightness value is changed continuously, reach the object brightness N of setting until the spoke brightness value of spectral radiance meter measurement
1
Calculate the contrast C of target and background:
Make tested electro-optical tracking device optical system aim at collimator objective, to target imaging, check the trapped state of this electro-optical tracking device to this known contrast target, adjust the clear aperture of diaphragm on the target integrating sphere repeatedly, continuously change the contrast of target and background, can capture contrast target hour until this electro-optical tracking device; At this moment, the contrast value of target and background is the actual test value of this electro-optical tracking device to low contrast target acquistion recognition capability.
2. electro-optical tracking device according to claim 1 is to the method for inspection of low contrast target acquistion ability, it is characterized in that the external light source on built-in light source on the described background integrating sphere and external light source, the target integrating sphere all adopts the power supply of accurate control power supply.
3. electro-optical tracking device according to claim 2 is characterized in that to the method for inspection of low contrast target acquistion ability described external light source adopts Halogen lamp LED, and this Halogen lamp LED is positioned on the focus of parabolic lens.
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| CN 201010144808 CN101846528A (en) | 2010-04-13 | 2010-04-13 | Detection method for capture capability of photoelectric tracking equipment to target with low contrast |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674104A (en) * | 2013-10-28 | 2014-03-26 | 中国科学院长春光学精密机械与物理研究所 | Method for increasing tracking distance of photoelectric device |
| CN107883982A (en) * | 2017-10-31 | 2018-04-06 | 北京航天计量测试技术研究所 | A kind of photogoniometer and method applied to star sensor calibration field |
| CN108279576A (en) * | 2017-12-26 | 2018-07-13 | 湖北航天技术研究院总体设计所 | A kind of composite shaft target following emulation test system |
| CN110536070A (en) * | 2018-05-23 | 2019-12-03 | 杭州海康威视数字技术股份有限公司 | A kind of infrared lamp control method, device and four mesh adjustable cameras |
| US10992875B2 (en) | 2017-12-27 | 2021-04-27 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method and apparatus for controlling infrared lamp, and four-lens adjustable camera |
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| CN2769913Y (en) * | 2005-02-20 | 2006-04-05 | 中国科学院安徽光学精密机械研究所 | Light path structure of adjustable illuminance diffused light source realized by integrating sphere |
| CN101539273A (en) * | 2009-05-05 | 2009-09-23 | 中国科学院长春光学精密机械与物理研究所 | Isochromatic and isothermic continuous dimming device based on integrating sphere |
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2010
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| CN2769913Y (en) * | 2005-02-20 | 2006-04-05 | 中国科学院安徽光学精密机械研究所 | Light path structure of adjustable illuminance diffused light source realized by integrating sphere |
| CN101539273A (en) * | 2009-05-05 | 2009-09-23 | 中国科学院长春光学精密机械与物理研究所 | Isochromatic and isothermic continuous dimming device based on integrating sphere |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674104A (en) * | 2013-10-28 | 2014-03-26 | 中国科学院长春光学精密机械与物理研究所 | Method for increasing tracking distance of photoelectric device |
| CN103674104B (en) * | 2013-10-28 | 2017-01-25 | 中国科学院长春光学精密机械与物理研究所 | Method for increasing tracking distance of photoelectric device |
| CN107883982A (en) * | 2017-10-31 | 2018-04-06 | 北京航天计量测试技术研究所 | A kind of photogoniometer and method applied to star sensor calibration field |
| CN108279576A (en) * | 2017-12-26 | 2018-07-13 | 湖北航天技术研究院总体设计所 | A kind of composite shaft target following emulation test system |
| US10992875B2 (en) | 2017-12-27 | 2021-04-27 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method and apparatus for controlling infrared lamp, and four-lens adjustable camera |
| CN110536070A (en) * | 2018-05-23 | 2019-12-03 | 杭州海康威视数字技术股份有限公司 | A kind of infrared lamp control method, device and four mesh adjustable cameras |
| CN110536070B (en) * | 2018-05-23 | 2020-12-25 | 杭州海康威视数字技术股份有限公司 | Infrared lamp control method and device and four-eye adjustable camera |
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Open date: 20100929 |