CN203216703U - Large-caliber stray light testing apparatus - Google Patents
Large-caliber stray light testing apparatus Download PDFInfo
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- CN203216703U CN203216703U CN 201320175839 CN201320175839U CN203216703U CN 203216703 U CN203216703 U CN 203216703U CN 201320175839 CN201320175839 CN 201320175839 CN 201320175839 U CN201320175839 U CN 201320175839U CN 203216703 U CN203216703 U CN 203216703U
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Abstract
The utility model relates to a large-caliber stray light testing apparatus. The large-caliber stray light testing apparatus comprises an object simulator, a spherical parallel light pipe, a detection system, and a data acquiring and processing system, wherein the object simulator is arranged in an incident light path of the spherical parallel light pipe; an optical system to be tested is arranged in an emergent light path of the spherical parallel light pipe; the detection system is arranged in an image plane of the optical system to be tested; and the detection system is connected with the data acquiring and processing system. The utility model provides the large-caliber stray light testing apparatus which is capable of effectively examining the stray light inhibiting capability of an optical system structure.
Description
Technical field
The utility model belongs to the optical detection field, relates to a kind of heavy caliber parasitic light proving installation, the proving installation of the heavy caliber parasitic light coefficient that adopts when relating in particular to a kind of examination that is mainly used in all kinds of optical cameras Performance of Optical System before ray machine butt joint.
Background technology
In recent years, along with high sensitivity, the development of low detection threshold detector has had higher requirement to the inhibition of optical system parasitic light, and this just requires the parasitic light measuring system that higher precision is arranged.
During optical system imaging, except by (or non-imaging) the normal light path imaging, still have some non-imaging light to drop on the image planes on image planes, these harmful lights that do not participate in imaging are called parasitic light.Parasitic light is very big to the influence of optical system picture element, because optical element, mechanical part etc. are to reflection of light and scattering in the system, the phenomenon that causes non-imaging light to spread in image planes makes system's imaging poor definition, contrast reduce.The modulation transfer function of optical system will reduce along with the increase of coefficient of stray light in whole spatial frequency range.Therefore, the parasitic light coefficient is the important indicator of reflection optical system imaging quality, and it is one of importance of optical system picture element detection that parasitic light detects.
Spaceborne various camera space is operated under the situation of the extremely weak echo signal of detection mostly, and target source and surround lighting be through the diffraction in optical system aperture, and the scattering of structure and optical element surface, reflection arrive image planes detector formation parasitic light.The reason that it produces is intricate, not only relevant with technology, the material of making optical system, also relevant with aberration characteristic, diffraction phenomena, target signature, it obviously reduces camera contrast and modulation transfer function, whole image planes level reduces, sharpness degenerates, even forms the veiling glare spot, when serious echo signal is flooded fully by the stray light emission noise.
The heavy caliber of present research, the parasitic light that long-focus parasitic light method of testing is primarily aimed at heavy-caliber optical system test, be that to survey the class camera with space flight at the high picture element of rail be background, launch camera space suppressed at the ground parasitic light that the ability calibration technology studies.
What the conventional optical systems parasitic light was measured generally use is the blackspot method of testing with integrating sphere after the integral coating, and this method of testing can be verified the stray light emission of target source through producing after the optical system.Traditional measurement mechanism can only be estimated a stray light emission that last target light source produces to the influence of detectivity, lacks the ability that the outer parasitic light of axle is measured; Yet be subjected to the stray light of outer other radiation sources generations of axle for space flight high sensitivity detection class phase chance, the target contrast that causes descends, therefore, the research of the outer parasitic light proving installation of axle seems particularly important for estimating the outer parasitic light inhibition level of optical system axis.
At present, in the development of various heavy calibers, long-focus camera space, common parasitic light measurement mechanism (blackspot method measuring system) can only be tested the parasitic light of small-bore optical system, as the optical system of bore smaller or equal to Φ 300mm, yet can't carry out unified test for the parasitic light coefficient that bore surpasses the optical system of Φ 300mm.This bore mainly due to heavy caliber, long-focal distance optical system is too big, focal length is oversize, and measurement mechanism is because optical material can't select for use heavy caliber transmission-type optical glass to make the achromatism collimator objective; Measure for the parasitic light of long-focal distance optical system simultaneously, if do not adopt collimator objective, can't simulate the target emanation of infinite distant place, thereby can not truly reflect the inhibition level of optical system parasitic light.Therefore, parasitic light coefficient measuring device in the past needs further to improve, to satisfy the needs that current optical system parasitic light is measured.
In addition, the target simulator of parasitic light measurement mechanism in the past all adopts " ox horn stopper " as extinction coefficient, and so that the blackspot target of high-contrast to be provided, its flatting efficiency is 1000:1; And for the measurement of high precision parasitic light coefficient, the target contrast of 1000:1 just seems, and extinction capability is too poor, thereby influences final parasitic light measuring accuracy (tend to because blackspot is black, cause parasitic light measurement result bigger than normal).
In sum, consider that this important function for of research is for the gordian technique to heavy caliber, the test of long-focal distance optical system parasitic light, this Study on Technology success will indicate that domestic heavy caliber, long-focus parasitic light ground calibration technique enter a new step.Therefore, carry out heavy caliber, long-focus, high precision parasitic light Research on Measuring Technology, will play the promotion effect to the development of China's optical system parasitic light fields of measurement.
The utility model content
In order to solve the above-mentioned technical matters that exists in the background technology, the utility model provides a kind of heavy caliber parasitic light proving installation that can effectively examine the parasitic light inhibition ability of optical system structure.
Technical solution of the present utility model is: the utility model provides a kind of heavy caliber parasitic light proving installation, and its special character is: described heavy caliber parasitic light proving installation comprises target simulator, spherical parallel light tube, detection system and data Collection ﹠ Processing System; Described target simulator is arranged on the input path of spherical parallel light tube; Optical system to be measured is arranged on the emitting light path of spherical parallel light tube; Described detection system is arranged on the image planes place of optical system to be measured; Described detection system links to each other with data Collection ﹠ Processing System.
The light source that above-mentioned spherical parallel light tube comprises integrating sphere, is arranged on the collimator objective on the integrating sphere ball wall and is arranged on integrating sphere inside; Described integrating sphere comprises light inlet and light-emitting window; Described target simulator is arranged on the light inlet place of integrating sphere; Optical system to be measured is arranged on the light-emitting window place of integrating sphere; The light that described light source sends is collimated to optical system to be measured by collimator objective after illuminating target simulator.
Above-mentioned target simulator is arranged on the light inlet place of integrating sphere and is in the focus place of collimator objective.
Above-mentioned collimator objective is off axis paraboloidal mirror.
Last target simulator is black target source and white object source.
The target contrast in above-mentioned black target source and white object source is 10000:1 at least.
Above-mentioned heavy caliber parasitic light proving installation also comprises the iris that is arranged between optical system to be measured and the detection system.
Above-mentioned heavy caliber parasitic light proving installation also comprises turntable; Described optical system to be measured and detection system all are arranged on the turntable.
The utility model advantage is:
The utility model is measured the problem of bringing in order to solve heavy caliber, the full visual field of long-focal distance optical system parasitic light, in conjunction with traditional blackspot method parasitic light test philosophy, a kind of heavy caliber, the full visual field of long-focal distance optical system parasitic light high-precision measuring method have been proposed, can effectively examine the parasitic light inhibition ability of optical system structure, machine-noise ratio to camera is estimated, structural modification type design proposal is proposed, guaranteed that optical system can blur-free imaging, the advantage that the utlity model has is specific as follows:
1) the utility model utilizes classical blackspot method measuring principle, a kind of high precision, heavy caliber, the full visual field of long-focal distance optical system parasitic light method of testing have been proposed, its measuring accuracy is broken through measuring accuracy in the past, and the parasitic light measured value is increased to 0.5% from original 1%;
2) the utility model is at the design of heavy caliber achromatism collimator objective, solved the difficult problem that heavy caliber, long-focal distance optical system parasitic light coefficient in the past can't be measured, and can measure the parasitic light coefficient more than the optical system bore Φ 300mm;
3) the utility model utilizes off axis paraboloidal mirror as collimator objective, can effectively reduce the parasitic light of being introduced by the transmission-type collimator objective, and the not high influence of the The measuring precision that causes;
4) the utility model cooperates turntable can realize the measurement of the full visual field of optical system parasitic light coefficient first;
5) target simulator that adopts of the utility model adopts special multiaspect to absorb the cavity design form, can make in the past that the target contrast of hickie and blackspot is increased to 10000:1 from 1000:1, effectively reduce because the parasitic light that target simulator produces causes the error of measurement.
Description of drawings
Fig. 1 is the principle schematic of heavy caliber parasitic light proving installation provided by the utility model;
Wherein:
The 1-target simulator; The 2-light source; The 3-integrating sphere; The 4-off axis paraboloidal mirror; The 5-turntable; The 6-detection system; 7-optical system to be measured; The 8-data Collection ﹠ Processing System.
Embodiment
Referring to Fig. 1, the utility model provides a kind of heavy caliber parasitic light proving installation, and this heavy caliber parasitic light proving installation comprises target simulator 1, spherical parallel light tube, detection system 6 and data Collection ﹠ Processing System 8; Target simulator 1 is arranged on the input path of spherical parallel light tube; Optical system 7 to be measured is arranged on the emitting light path of spherical parallel light tube; Detection system 6 is arranged on the image planes place of optical system 7 to be measured; Detection system 6 links to each other with data Collection ﹠ Processing System 8.
The light source 2 that spherical parallel light tube comprises integrating sphere 3, is arranged on the collimator objective on the integrating sphere 3 ball walls and is arranged on integrating sphere 3 inside; Integrating sphere 3 comprises light inlet and light-emitting window; Target simulator 1 is arranged on the light inlet place of integrating sphere 3; Optical system 7 to be measured is arranged on the light-emitting window place of integrating sphere 3; The light that light source 2 sends illuminates target simulator 1 back and is collimated to optical system 7 to be measured by collimator objective.
Target simulator 1 is arranged on the light inlet place of integrating sphere 3 and is in the focus place of collimator objective.
Collimator objective is off axis paraboloidal mirror 4.Last target simulator 1 is black target source and white object source.The target contrast in black target source and white object source is 10000:1 at least.Heavy caliber parasitic light proving installation also comprises the iris that is arranged between optical system 7 to be measured and the detection system 6.Heavy caliber parasitic light proving installation also comprises turntable 5; Optical system 7 to be measured and detection system 6 all are arranged on the turntable 5.
Principle of work of the present utility model is: select for use target simulator 1 to be the black and white target source, it is arranged on the sidewall of integrating sphere 3, be positioned at the focus place of off axis paraboloidal mirror 4, light the light source that integrating sphere 3 inwalls go out, look especially as the bright dark target emanation from the infinite distance from integrating sphere 3 outlets, the light ray radiation of 2 π solid angles can be formed simultaneously in integrating sphere 3 outlets, spherical parallel light tube can be formed.
Before the measurement, earlier optical system 7 to be measured is arranged on spherical parallel light tube exit (integrating sphere), and makes its optical axis consistent with objective lens optical axis (parasitic light test on the axle).Spherical parallel light tube target simulator 1 place loads onto black stopper, can see the picture of the black plug hole of spherical parallel light tube on its focal plane by optical system 7 to be measured.Blackspot is transferred to visual field central authorities, usually can choose black stopper diameter less than 1/5 of graticule diameter by the blackspot diameter of in optical system to be measured 7 visual fields, seeing, in optical system 7 image planes to be measured detection system 6 is set, before detection system 6 windows iris is set, regulating its diameter should be less than the diameter of the black plug hole picture of parallel light tube.
During measurement, change a white stopper not with holes at the black stopper place of spherical parallel light tube earlier, at this moment through after parallel light tube object lens and the optical system to be measured, what go into that the perforation place obtains in detection system 6 is the picture of this white stopper, namely for illumination and parasitic light illumination two parts sum by imaging beam, at this moment can obtain a reading m from data Collection ﹠ Processing System 8 in the illumination of going into the perforation place
1Take off white stopper and change black stopper, can go into the perforation place in detection system and obtain the blackspot picture, the illumination of blackspot picture is not zero if system has parasitic light, because there is certain illumination existing of parasitic light in the blackspot picture, can obtain a reading m at data Collection ﹠ Processing System this moment again
0, then the parasitic light coefficient of optical system to be measured is:
In the formula: θ is the Point Target of the different field angle of optical system, and η (θ) is optical system parasitic light coefficient to be measured, m
0(θ) be the illumination that the black stopper in the target simulator produces at the image planes place through optical system, m
1(θ) the white stopper in the target simulator is through the illumination of optical system in the generation of image planes place.During test, cooperate turntable, can realize the measurement to the full visual field of optical system parasitic light coefficient, upward the parasitic light coefficient measuring method is the same with axle for concrete measuring method.
The wherein following introduction of the function of each several part:
Target simulator 1 mainly is for the target simulation source of high-contrast is provided; It can make the target contrast of black stopper and white stopper reach 10000:1, and then can eliminate the measuring error that the target simulation parasitic light causes by the design of multiaspect absorption cavity.Light source mainly for the illumination of integrating sphere 3 is provided, is simulated the radiation source of optical system to be measured.Integrating sphere 3 constitutes one of critical piece of spherical parallel light tube, and simulation outlet radiant light uniformly can be provided, and the luminous energy that forms 2 π solid angles distributes.The effect of off axis paraboloidal mirror 4 provides the target source of the infinite distant place of simulation; Because traditional transmission-type collimator objective can't satisfy the achromatic purpose of heavy caliber, so break through transmissive design method in the past here, adopt off axis paraboloidal mirror to realize heavy caliber, long-focus, the spherical parallel light tube Design of device of achromatism type.Turntable 5 mainly provides optical system to be measured different field angle simulations.Detection system 6 is mainly used in receiving the luminous energy from optical system image planes to be measured place, iris is set before its detector window can effectively suppresses the environment parasitic light to the influence of measuring accuracy.Optical system 7 to be measured is testpieces of this method of testing, is used for the feasibility of this method of testing of checking.Data acquisition and disposal system 8 are mainly finished optical system to be measured in the luminous energy collection of different field angle, and the data of finishing the parasitic light test are simultaneously handled, curve is drawn.
Claims (8)
1. heavy caliber parasitic light proving installation, it is characterized in that: described heavy caliber parasitic light proving installation comprises target simulator, spherical parallel light tube, detection system and data Collection ﹠ Processing System; Described target simulator is arranged on the input path of spherical parallel light tube; Optical system to be measured is arranged on the emitting light path of spherical parallel light tube; Described detection system is arranged on the image planes place of optical system to be measured; Described detection system links to each other with data Collection ﹠ Processing System.
2. heavy caliber parasitic light proving installation according to claim 1 is characterized in that: the light source that described spherical parallel light tube comprises integrating sphere, is arranged on the collimator objective on the integrating sphere ball wall and is arranged on integrating sphere inside; Described integrating sphere comprises light inlet and light-emitting window; Described target simulator is arranged on the light inlet place of integrating sphere; Optical system to be measured is arranged on the light-emitting window place of integrating sphere; The light that described light source sends is collimated to optical system to be measured by collimator objective after illuminating target simulator.
3. heavy caliber parasitic light proving installation according to claim 2, it is characterized in that: described target simulator is arranged on the light inlet place of integrating sphere and is in the focus place of collimator objective.
4. heavy caliber parasitic light proving installation according to claim 3, it is characterized in that: described collimator objective is off axis paraboloidal mirror.
5. according to the described heavy caliber parasitic light of the arbitrary claim of claim 1-4 proving installation, it is characterized in that: described target simulator is black target source and white object source.
6. heavy caliber parasitic light proving installation according to claim 5, it is characterized in that: the target contrast in described black target source and white object source is 10000:1 at least.
7. heavy caliber parasitic light proving installation according to claim 6, it is characterized in that: described heavy caliber parasitic light proving installation also comprises the iris that is arranged between optical system to be measured and the detection system.
8. heavy caliber parasitic light proving installation according to claim 7, it is characterized in that: described heavy caliber parasitic light proving installation also comprises turntable; Described optical system to be measured and detection system all are arranged on the turntable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320175839 CN203216703U (en) | 2013-04-09 | 2013-04-09 | Large-caliber stray light testing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320175839 CN203216703U (en) | 2013-04-09 | 2013-04-09 | Large-caliber stray light testing apparatus |
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| CN203216703U true CN203216703U (en) | 2013-09-25 |
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| CN 201320175839 Withdrawn - After Issue CN203216703U (en) | 2013-04-09 | 2013-04-09 | Large-caliber stray light testing apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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-diameter stray light measuring device and testing method |
| CN109238656A (en) * | 2018-07-19 | 2019-01-18 | 北京空间机电研究所 | A kind of super large caliber Stray Light Test light source and its control method |
-
2013
- 2013-04-09 CN CN 201320175839 patent/CN203216703U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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-diameter stray light measuring 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 | Heavy caliber Stray Light Test device and method of testing |
| CN109238656A (en) * | 2018-07-19 | 2019-01-18 | 北京空间机电研究所 | A kind of super large caliber Stray Light Test light source and its control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130925 Effective date of abandoning: 20160608 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130925 Effective date of abandoning: 20160608 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |