CN101178337A - Large-caliber stray light coefficient testing method and system based on calculation holographic element - Google Patents
Large-caliber stray light coefficient testing method and system based on calculation holographic element Download PDFInfo
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- CN101178337A CN101178337A CNA2006101048624A CN200610104862A CN101178337A CN 101178337 A CN101178337 A CN 101178337A CN A2006101048624 A CNA2006101048624 A CN A2006101048624A CN 200610104862 A CN200610104862 A CN 200610104862A CN 101178337 A CN101178337 A CN 101178337A
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Abstract
The invention relates to a stray light coefficient testing method and a system thereof, in particular to a large-caliber stray light coefficient testing method and a system thereof based on a computer-generated holographic element. The technical solution is as follows: the method comprises the following steps: 1) expanding the emergent laser beam into large-caliber parallel light; 2) irradiating the large-caliber parallel light onto a computer holographic optical element to obtain a hollow light beam; 3) after the hollow light beam is emitted into the optical system to be detected, a black spot area surrounded by a bright light area is formed on the back focal plane of the optical system to be detected; 4) respectively measuring the illuminance E of black spot areasbAnd illuminance E of the bright areaw(ii) a 5) According to the formula
Obtaining the stray light coefficient e. The technical problems that the test is inconvenient and the realization difficulty is difficult in the common technology are solved.
Description
Technical field
The present invention relates to a kind of stray light coefficient testing method and system thereof, especially a kind of large caliber stray light coefficient testing method and system thereof based on calculating holographic element.
Background technology
The development of heavy caliber imaging optical system has promoted each development of technologies greatly, its stray light level can produce material impact as an important indicator of optical system to the image contrast and the resolution of imaging optical system, especially in some detection application field, stray light level has directly influenced the raising of detectivity, thus the veiling glare of optical system design and detect imperative.From the research of association area both domestic and external, main by test solution to point source transmitance (PST) and two kinds of parameters of coefficient of stray light (V) to the evaluation and the check of veiling glare level.
The check of domestic PST parameter to heavy-caliber optical system is mainly used the parallel light tube of laser lighting to add turntable and is finished., the PST parameter estimates that therefore can not be used to estimate with the earth is veiling glare level under the space optics earth observation applicable cases of background because being primarily aimed at the veiling glare that pointolite causes.
The uniform area light source measurement that can utilize the heavy caliber integrating sphere to make the band black objects on the measure theory of coefficient of stray light realizes.The opening diameter of heavy caliber integrating sphere must surpass the bore of detected optics system in the method, and the collimating optics camera lens of equal bore to be set in the exit, the outlet diameter of heavy caliber integrating sphere should be less than 1/3 of its diameter simultaneously, after the optics clear aperture of tested optical system surpasses 500mm, the bore of integrating sphere and collimating optics camera lens becomes and can't realize, therefore the method for also testing from the veiling glare that the relevant heavy-caliber optical system of solution occurs at present.
Summary of the invention
The invention solves the above-mentioned technical matters that exists in the background technology for solving, and a kind of convenient test is provided, realize little large caliber stray light coefficient testing method and the system thereof of difficulty.
Technical solution of the present invention is: the present invention is a kind of large caliber stray light coefficient testing method based on calculating holographic element, and its special character is: this method may further comprise the steps:
1) emitting laser is expanded Shu Chengwei heavy caliber directional light;
2) this heavy caliber directional light is shone on the computer-generated hologram optical element obtain hollow beam;
3) hollow beam is gone out to inject optical system to be measured after, on optical system back focal plane to be measured, form the blackspot zone that is centered on by the light district;
4) measure blackspot area light illumination E respectively
bAnd the illuminance E in light district
w
5) according to formula
Draw coefficient of stray light e.
Above-mentioned steps 5) can utilize the radiancy meter to carry out the demarcation of radiance at each shooting angle in, (ω ψ), is modified to coefficient of stray light e formula to obtain fair curve C
A kind of test macro of realizing above-mentioned large caliber stray light coefficient testing method based on calculating holographic element, its special character is: but this system comprises the illuminometer of laser instrument, heavy caliber parallel light tube, computer-generated hologram optical element and measuring light illumination, and laser instrument, heavy caliber parallel light tube, computer-generated hologram optical element are arranged on the same light path in regular turn.
Be provided with folding axle catoptron between above-mentioned laser instrument and the heavy caliber parallel light tube.
Above-mentioned test macro also includes and can carry out the radiancy meter that radiance is demarcated.
The present invention has the following advantages:
1, the present invention uses the heavy caliber parallel light tube of laser lighting and settles bigbore computer-generated hologram optical element (CGH) at the pupil place, simulate the black target under the bright background that produces the infinite distance, computer-generated hologram optical element (CGH) is as key element, its bore can be suitable with tested optical system, do not need to use bigbore integrating sphere and collimating optical system, just can realize the test of the coefficient of stray light of heavy-caliber optical system, employed CGH unmatchful center requirement simultaneously, its preparation difficulty is less, and heavy caliber CGH can use the method splicing of mould to make, therefore under the sharpness that guarantees its black object edge is not subjected to situation that the flatness of CGH element influences, can on plastic sheeting, produce the element of any size, therefore all available method of the present utility model of optical system of much bores is measured coefficient of stray light, thereby fundamentally solves the problems of measurement of heavy-caliber optical system coefficient of stray light.
2, in light weight, volume is little.The whole system of realization the inventive method is in light weight, volume is little, can realize the measurement of bigbore optical system easily.
Description of drawings
Fig. 1 is the structural representation of test macro of the present invention.
Embodiment
Concrete grammar step of the present invention is as follows:
1) emitting laser is expanded Shu Chengwei heavy caliber directional light;
2) this heavy caliber directional light is shone on the computer-generated hologram optical element obtain hollow beam;
3) hollow beam is gone out to inject optical system to be measured after, on optical system back focal plane to be measured, form the blackspot zone that is centered on by the light district;
4) measure blackspot area light illumination E respectively
bAnd the illuminance E in light district
w
5) according to formula
Draw coefficient of stray light e.The E that error causes that manufactures and designs owing to computer-generated hologram optical element (CGH)
wCan change along with the variation of lighting angle and shooting angle, therefore can utilize the radiancy meter to carry out the demarcation of radiance at each shooting angle, (ω ψ), is modified to coefficient of stray light e formula to obtain fair curve C
To eliminate the error that the computer-generated hologram optical element brings, make the coefficient of stray light that records more accurate.
Referring to Fig. 1, test macro of the present invention comprises laser instrument 1, heavy caliber parallel light tube 5 and the computer-generated hologram optical element 6 that is arranged in regular turn on the same light path, but and the illuminometer 4 of measuring light illumination, also can be provided with folding axle catoptron 2 between laser instrument 1 and the heavy caliber parallel light tube 5, its laser that laser instrument 1 is sent reflects, the compactness that test macro of the present invention is become; Test macro of the present invention also includes and can carry out the radiancy meter that radiance is demarcated.
When test macro of the present invention was worked, the laser of the certain power of laser instrument 1 emission became parallel beam via heavy caliber parallel light tube 5 collimations, shines on the bigbore computer-generated hologram optical element (CGH) 6 and has obtained so-called hollow beam.Promptly by the light beam capacity of decomposition of computer-generated hologram optical element, parallel beam is for conversion near the zero level angle to lacking level, and luminous energy is evenly decomposed in other angular ranges, form the uniform area light source that corresponding infinite distance has black objects thus.At this moment with the zero level position of the optical axis alignment computer-generated hologram optical element 6 of optical system 3 to be measured, then on the focal plane of optical system 3 to be measured, can obtain the optics background image that causes by veiling glare purely.Both optical axises are staggered then can get under the even bright target optical system response.By the image focal plane illumination of illuminometer 4 measurement veiling glare background image illumination and even bright target, the coefficient of stray light that the ratio of two image illuminations promptly should be mutually.
Explanation of nouns:
Hollow beam: refer to certain light beam in the specific no optical radiation in solid angle zone (being generally taper shape), and in other solid angle zone of semispace, even optical radiation is arranged.
Claims (5)
1. large caliber stray light coefficient testing method based on calculating holographic element, it is characterized in that: this method may further comprise the steps:
1) emitting laser is expanded Shu Chengwei heavy caliber directional light;
2) this heavy caliber directional light is shone on the computer-generated hologram optical element obtain hollow beam;
3) hollow beam is gone out to inject optical system to be measured after, on optical system back focal plane to be measured, form the blackspot zone that is centered on by the light district;
4) measure blackspot area light illumination E respectively
bAnd the illuminance E in light district
w
5) according to formula
Draw coefficient of stray light e.
2. the large caliber stray light coefficient testing method based on calculating holographic element according to claim 1, it is characterized in that: can utilize the radiancy meter to carry out the demarcation of radiance at each shooting angle in the described step 5), (ω ψ), is modified to coefficient of stray light e formula to obtain fair curve C
3. test macro of realizing the described large caliber stray light coefficient testing method based on calculating holographic element of claim 1, it is characterized in that: but this system comprises the illuminometer of laser instrument, heavy caliber parallel light tube, computer-generated hologram optical element and measuring light illumination, and described laser instrument, heavy caliber parallel light tube, computer-generated hologram optical element are arranged on the same light path in regular turn.
4. the large caliber stray light coefficient test macro based on calculating holographic element according to claim 3 is characterized in that: be provided with folding axle catoptron between described laser instrument and the heavy caliber parallel light tube.
5. according to claim 3 or 4 described large caliber stray light coefficient test macros based on calculating holographic element, it is characterized in that: described test macro also includes and can carry out the radiancy meter that radiance is demarcated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610104862A CN100587443C (en) | 2006-11-07 | 2006-11-07 | Large-caliber stray light coefficient testing method and system based on computer holographic optical element |
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| CN200610104862A CN100587443C (en) | 2006-11-07 | 2006-11-07 | Large-caliber stray light coefficient testing method and system based on computer holographic optical element |
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| CN101178337A true CN101178337A (en) | 2008-05-14 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175431A (en) * | 2011-01-28 | 2011-09-07 | 哈尔滨工业大学 | Device for measuring point source stray light transmission coefficient in large dynamic range |
| CN102680213A (en) * | 2012-06-18 | 2012-09-19 | 合肥知常光电科技有限公司 | Rapid detecting method and device for optical property of heavy-caliber optical element |
| CN102749184A (en) * | 2012-07-06 | 2012-10-24 | 中国科学院西安光学精密机械研究所 | Large-field-of-view stray light PST (particle swarm optimization) testing method and device |
| CN103149016A (en) * | 2013-02-27 | 2013-06-12 | 中国科学院西安光学精密机械研究所 | Stray light detection method and system for optical system to be detected |
| CN103234734A (en) * | 2013-04-09 | 2013-08-07 | 中国科学院西安光学精密机械研究所 | large-caliber stray light testing device and testing method |
| CN103868679A (en) * | 2014-02-28 | 2014-06-18 | 北京空间机电研究所 | Stray radiation test device for infrared optical remote sensor |
| CN105181303A (en) * | 2015-10-26 | 2015-12-23 | 中国科学院苏州生物医学工程技术研究所 | Instrument for testing stray light of finite-conjugate-distance microscope objective and testing precision adjustment method |
| CN111982467A (en) * | 2020-07-17 | 2020-11-24 | 中国科学院西安光学精密机械研究所 | Device and method for aligning optical axis of collimator and optical axis of optical-mechanical system in stray light test |
| CN113701675A (en) * | 2021-08-02 | 2021-11-26 | 清华大学 | Stray light measuring device and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5011284A (en) * | 1990-03-22 | 1991-04-30 | Kaiser Optical Systems | Detection system for Raman scattering employing holographic diffraction |
| NL1024232C2 (en) * | 2003-09-05 | 2005-03-08 | Konink Nl Akademie Van Wetensc | Method and device for measuring retinal stray light. |
| CN200965488Y (en) * | 2006-11-07 | 2007-10-24 | 中国科学院西安光学精密机械研究所 | Large-caliber stray light coefficient testing system based on calculation holographic element |
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2006
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175431A (en) * | 2011-01-28 | 2011-09-07 | 哈尔滨工业大学 | Device for measuring point source stray light transmission coefficient in large dynamic range |
| CN102680213A (en) * | 2012-06-18 | 2012-09-19 | 合肥知常光电科技有限公司 | Rapid detecting method and device for optical property of heavy-caliber optical element |
| CN102680213B (en) * | 2012-06-18 | 2015-03-25 | 合肥知常光电科技有限公司 | Rapid detecting method and device for optical property of heavy-caliber optical element |
| CN102749184B (en) * | 2012-07-06 | 2015-01-07 | 中国科学院西安光学精密机械研究所 | Large-field-of-view stray light PST (particle swarm optimization) testing method and device |
| CN102749184A (en) * | 2012-07-06 | 2012-10-24 | 中国科学院西安光学精密机械研究所 | Large-field-of-view stray light PST (particle swarm optimization) testing method and device |
| CN103149016A (en) * | 2013-02-27 | 2013-06-12 | 中国科学院西安光学精密机械研究所 | Stray light detection method and system for optical system to be detected |
| CN103234734A (en) * | 2013-04-09 | 2013-08-07 | 中国科学院西安光学精密机械研究所 | large-caliber stray light testing device and testing method |
| CN103234734B (en) * | 2013-04-09 | 2016-06-08 | 中国科学院西安光学精密机械研究所 | large-caliber stray light testing device and testing method |
| CN103868679A (en) * | 2014-02-28 | 2014-06-18 | 北京空间机电研究所 | Stray radiation test device for infrared optical remote sensor |
| CN103868679B (en) * | 2014-02-28 | 2016-05-04 | 北京空间机电研究所 | A kind of infrared optics remote sensor stray radiation testing arrangement |
| CN105181303A (en) * | 2015-10-26 | 2015-12-23 | 中国科学院苏州生物医学工程技术研究所 | Instrument for testing stray light of finite-conjugate-distance microscope objective and testing precision adjustment method |
| CN105181303B (en) * | 2015-10-26 | 2017-10-27 | 中国科学院苏州生物医学工程技术研究所 | Infinity conjugate distance microcobjective Stray Light Testing Equipment and measuring accuracy adjusting method |
| CN111982467A (en) * | 2020-07-17 | 2020-11-24 | 中国科学院西安光学精密机械研究所 | Device and method for aligning optical axis of collimator and optical axis of optical-mechanical system in stray light test |
| CN113701675A (en) * | 2021-08-02 | 2021-11-26 | 清华大学 | Stray light measuring device and method |
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| CN100587443C (en) | 2010-02-03 |
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