CN107560828A - A kind of gleam image intensifier signal to noise ratio calibrating installation - Google Patents
A kind of gleam image intensifier signal to noise ratio calibrating installation Download PDFInfo
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- CN107560828A CN107560828A CN201610515828.XA CN201610515828A CN107560828A CN 107560828 A CN107560828 A CN 107560828A CN 201610515828 A CN201610515828 A CN 201610515828A CN 107560828 A CN107560828 A CN 107560828A
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- image intensifier
- noise ratio
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Abstract
The invention provides a kind of gleam image intensifier signal to noise ratio calibrating installation, include standard halogen tungsten lamp light source, optical filter, integrating sphere, circular hole diaphragm, it is conjugated symmetrical lens system, test radome, faint illumination photometer, the light that the standard halogen tungsten lamp light source is sent multiple diffusing reflection in integrating sphere after filter set decays, then uniform light spots are formed in integrating sphere exit, integrating sphere illuminates the circular hole diaphragm before it, diaphragm finally focuses on the faint illumination photometer of the standard being placed in camera bellows the circle hot spot for forming an a diameter of 0.2mm by conjugated lens, the faint illumination photometer of standard is switched into image intensifier to be measured again, it is achieved in the calibration to gleam image intensifier signal to noise ratio.Effective lifting to gleam image intensifier signal to noise ratio calibration accuracy can be achieved in the present invention, reduces measurement error, improving measurement accuracy.
Description
Technical field
The present invention designs a kind of gleam image intensifier signal to noise ratio calibrating installation, belongs to technical field of optical test.
Background technology
Low-light Level Night Vision Technology is specialized under conditions of night asks low-light (level), is mutually turned between photon-electron image information
The physical process such as change, strengthen, handling, showing, improving the visual capacity of human eye, so as to realize a kind of high-new skill of night observation
Art.With the help of low-light level imaging device, human eye is overcome in low-light (level) using photoelectronic imaging and is born the limit spectral response winter
Limitation under part, reach the purpose of developing human eye vision；It is according to the external photoeffect of device, electron multiplication and steamed stuffed bun conversion etc.
Principle, using the photoelectron of photon one as image-carrier, to the scene image under faint light or other any black light irradiations, enter
Row intake, conversion and enhancing, are finally shown as the visible image of human eye, are the important components of modern age photoelectron technology, micro-
The most basic effect of light night vision technology is to extend human eye under low light conditions to the observing capacity of optical information, improves human eye
Space identity ability.
Gleam image intensifier is the core devices that night-vision equipment is modernized in Low-light Level Night Vision Technology, and it decides lll night vision
The overall performance and price of equipment.And the important evaluating of gleam image intensifier photoelectric properties is exactly signal to noise ratio, its direct shadow
The performance of low-light complete machine has been rung, and has determined the most important system performance parameter of detection limit under poor light condition, signal to noise ratio is determined
The target acquisition ability under poor light condition is determined, the accurate measurement of its parameter is in gleam image intensifier development and production process
Play an important role, also the performance test to gleam image intensifier and the research of assessment technology are significant.
Because signal to noise ratio parameter measurement techniques are extremely complex, the domestic research in signal to noise ratio detection device manufacturing technology is also not
Maturation, domestic there is presently no gleam image intensifier signal to noise ratio calibrating installation；Meanwhile gleam image intensifier cathode plane illuminance
Size is to influence an important factor for whether accurate its snr measurement is, because measurement signal to noise ratio light source is diameter 0.2mm, illuminance
For 1.08 × 10-4Lx or 1.29 × 10-5Lx faint light source, Indexes Comparison is difficult, therefore no matter both at home and abroad, signal to noise ratio light source
The method that illumination photometry connects measurement and transmitted using asking, i.e., measure integrating sphere exit light using selenium cell and photoelectricity galvanometer
Electric current, then by calculating conversion as the brightness value on cathode plane.And selenium cell is can not directly to detect 1.08 × 10-4Lx or
1.29×10-5Lx rank illumination, cause image intensifier cathode plane Input illumination can not accurate measurement, it is impossible to realize that faint light is shone
The quantitatively calibrating of degree, the method transmitted can only be used, and this will cause very big transmission error, can not meet low-light image intensifying
The requirement that device signal to noise ratio parameter accurately measures；The small weak light source illumination of signal to noise ratio can not in gleam image intensifier snr measurement
Accurate Calibration.
The content of the invention
It is an object of the invention to solve the problems, such as that existing gleam image intensifier signal to noise ratio calibration accuracy is low, there is provided a kind of
Gleam image intensifier signal to noise ratio calibrating installation, it can effectively improve gleam image intensifier signal to noise ratio calibration accuracy.
The technical solution of the present invention：
A kind of gleam image intensifier signal to noise ratio calibrating installation, comprising：
Standard halogen tungsten lamp light source, optical filter, integrating sphere, circular hole diaphragm, the symmetrical lens unit of conjugation, faint illumination photometer, institute
The light that the standard halogen tungsten lamp light source of stating is sent multiple diffusing reflection in integrating sphere after optical filter is decayed, then goes out in integrating sphere
Formed at mouthful after radiation source by circular hole diaphragm, the faint illumination of standard being placed in camera bellows is finally focused on by conjugated lens
The circle hot spot of an a diameter of 0.2mm is formed on meter, then the faint illumination photometer of standard is switched into image intensifier to be measured, by treating micrometer
The output electric signal of light image booster judges whether it meets index request, be determined as if index request is unsatisfactory for it is unqualified,
It is achieved in the calibration to gleam image intensifier signal to noise ratio.
The optical filter can realize the optical energy attenuation from 100 times to 1,000,000 times.
Spot size on the gleam image intensifier face is φ 0.2mm, and illumination is 1.08 × 10-4Lx or 1.29 × 10- 5lx。
The symmetrical lens unit of conjugation is transmission-type, and its pantograph ratio is 1：1, system focal length scope is 10mm~500mm,
System bore scope is 2mm~50mm.
The integrating sphere is hollow spherical shell, internal spray poem Belém coating, the diameter range of integrating sphere for 150mm~
1000mm, integrating sphere exit brightness uniformity are more than 97%.
The measurement range of the faint illumination photometer is 1 × 10-6Lx~1lx, its detector are photomultiplier.
The beneficial effect of the present invention compared with prior art：
(1) present invention is conjugated symmetrical lens unit using a conjugation and is imaged aperture spatially, passes through faint photograph
Degree meter directly can be demarcated directly to gleam image intensifier signal to noise ratio calibrating installation, calibrated gleam image intensifier noise
Directly gleam image intensifier can be calibrated than calibrating installation.
(2) effective lifting to gleam image intensifier signal to noise ratio calibration accuracy can be achieved in the present invention, reduces measurement error, carries
Rise measurement accuracy.
Brief description of the drawings
Included accompanying drawing is used for providing being further understood from the embodiment of the present invention, which constitutes one of specification
Point, for illustrating embodiments of the invention, and the principle for the explaination present invention that comes together with word description.It should be evident that below
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creation
Property it is laborious on the premise of, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is gleam image intensifier signal to noise ratio calibrating installation structured flowchart of the present invention；
Fig. 2 is gleam image intensifier signal to noise ratio calibrating installation integrating sphere principle schematic of the present invention；
Fig. 3 is the fundamental diagram of gleam image intensifier signal to noise ratio calibrating installation of the present invention.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.In the following description, for solution
Release and nonrestrictive purpose, elaborate detail, to help to be apparent from the present invention.However, to people in the art
It is readily apparent that the present invention can also be put into practice in the other embodiments departing from these details for member.
Herein it should be noted that in order to avoid having obscured the present invention because of unnecessary details, only show in the accompanying drawings
Go out with according to the closely related device structure of the solution of the present invention and/or processing step, and eliminating with relation of the present invention not
Big other details.
Embodiments of the invention are illustrated with reference to the accompanying drawings.
As shown in figures 1 and 3, a kind of gleam image intensifier signal to noise ratio calibrating installation, including standard halogen tungsten lamp light source, optical filtering
Piece, integrating sphere, conjugation symmetric lens, test radome, faint illumination photometer, the light that the standard halogen tungsten lamp light source is sent pass through
The multiple diffusing reflection in integrating sphere after filter set decay, then formed in integrating sphere exit after radiation source by circular hole light
Door screen, finally focused on by conjugated lens on the faint illumination photometer of standard being placed in camera bellows and form the circle of an a diameter of 0.2mm
Hot spot, then the faint illumination photometer of standard is switched into image intensifier to be measured, sentenced by the output electric signal of gleam image intensifier to be measured
Break its whether meet index request, be determined as if index request is unsatisfactory for it is unqualified, be achieved in gleam image intensifier believe
Make an uproar than calibration.
Optical filter uses neutral colour filter, and attenuation coefficient is almost unchanged in 300nm~900nm wavelength bands, single filter
The decay multiplying power of mating plate is 100 times, and the decay multiplying power of 3 optical filters is 1,000,000 times.
As shown in Fig. 2 integrating sphere is hollow spherical shell, internal spray poem Belém coating, the diameter range of integrating sphere is
150mm~1000mm, integrating sphere exit brightness uniformity are more than 97%.
The conjugation symmetric lens pantograph ratio is 1：1, system focal length scope is 10mm~500mm, and system bore scope is
2mm~50mm.The conjugation symmetric lens selective transmission formula, transmission-type is more short out than reflecting light, it is easier to designs.
The measurement range of the faint illumination photometer is 1 × 10-6lx~1lx, and its detector is photomultiplier.It is described micro-
Spot size on light image booster face is φ 0.2mm, and illumination is 1.08 × 10-4Lx or 1.29 × 10-5lx。
Gleam image intensifier signal to noise ratio calibrating installation is calibrated by faint illumination photometer first, then carries out school to faint image intensifier
It is accurate.
The operation principle of the present invention：
Standard halogen tungsten lamp light source sends the light that colour temperature is 2800K, after optical filter is decayed and is filtered, passes through integration
The entrance slit of ball enters inside integrating sphere, after carrying out uniform mixed light inside integrating sphere, is formed in the exit of integrating sphere
The higher Lambertian radiation source of even property, diameter is formed in image space by conjugated lens again after Lambertian radiation source lighting circular hole diaphragm
0.2mm circular light spot, circular light spot can just cover whole receiving planes of faint illumination photometer and gleam image intensifier, first
Using the circular light spot illumination of faint illumination photometer measurement conjugated lens image space, and adjust integrating sphere entrance slit size so that micro-
The circular light spot illumination that weak illumination photometer measures is 1.08 × 10-4Lx or 1.29 × 10-5Lx, then faint illumination photometer is switched to and treated
Gleam image intensifier is surveyed, the illuminance that now gleam image intensifier signal to noise ratio calibrating installation is sent is known quantity, passes through low-light picture
The electric signal of booster output judges whether gleam image intensifier is qualified.
The many features and advantage of embodiments of the invention are clear, therefore appended claims according to the detailed description
It is intended to cover all these feature and advantage fallen into its true spirit and scope of these embodiments.Further, since ability
The technical staff in domain is readily apparent that many modifications and changes, therefore is not meant to embodiments of the invention being limited to illustrated and description
Precision architecture and operation, but all suitable modifications and the equivalent fallen into the range of it can be covered.
Unspecified part of the present invention is known to the skilled person technology.
Claims (6)
1. a kind of gleam image intensifier signal to noise ratio calibrating installation, it is characterised in that include：
Standard halogen tungsten lamp light source, optical filter, integrating sphere, circular hole diaphragm, the symmetrical lens unit of conjugation, faint illumination photometer, the mark
The light that quasi- halogen tungsten lamp light source is sent multiple diffusing reflection in integrating sphere after optical filter is decayed, then in integrating sphere exit
Formed after radiation source by circular hole diaphragm, finally focused on by conjugated lens on the faint illumination photometer of standard being placed in camera bellows
The circle hot spot of an a diameter of 0.2mm is formed, then the faint illumination photometer of standard is switched into image intensifier to be measured, passes through low-light picture to be measured
The output electric signal of booster judges whether it meets index request, be determined as if index request is unsatisfactory for it is unqualified, thus
Realize the calibration to gleam image intensifier signal to noise ratio.
A kind of 2. gleam image intensifier signal to noise ratio calibrating installation according to claim 1, it is characterised in that the optical filter
The optical energy attenuation from 100 times to 1,000,000 times can be realized.
A kind of 3. gleam image intensifier signal to noise ratio calibrating installation according to claim 1, it is characterised in that the low-light picture
Spot size on booster face is φ 0.2mm, and illumination is 1.08 × 10-4Lx or 1.29 × 10-5lx。
A kind of 4. gleam image intensifier signal to noise ratio calibrating installation according to claim 1, it is characterised in that the conjugate pair
Lens unit is referred to as transmission-type, and its pantograph ratio is 1：1, system focal length scope is 10mm~500mm, and system bore scope is 2mm
~50mm.
A kind of 5. gleam image intensifier signal to noise ratio calibrating installation according to claim 1, it is characterised in that the integrating sphere
For hollow spherical shell, internal spray poem Belém coating, the diameter range of integrating sphere is 150mm~1000mm, integrating sphere exit
Brightness uniformity is more than 97%.
A kind of 6. gleam image intensifier signal to noise ratio calibrating installation according to claim 1, it is characterised in that the faint photograph
The measurement range of degree meter is 1 × 10-6Lx~1lx, its detector are photomultiplier.
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| CN201610515828.XA CN107560828A (en) | 2016-07-01 | 2016-07-01 | A kind of gleam image intensifier signal to noise ratio calibrating installation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244037A (en) * | 2019-07-01 | 2019-09-17 | 北京乐普医疗科技有限责任公司 | A kind of chemiluminescence detection mould group |
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| CN104614154A (en) * | 2015-02-03 | 2015-05-13 | 南京理工大学 | Testing device for radiation luminance gain of ultraviolet image intensifier |
| CN104990688A (en) * | 2015-06-29 | 2015-10-21 | 南京理工大学 | Double-light-path image intensifier signal to noise ratio testing device |
| CN105319052A (en) * | 2015-11-30 | 2016-02-10 | 武汉光驰科技有限公司 | Low-light-level image intensifier characteristic test system |
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Patent Citations (4)
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| CN102353519A (en) * | 2011-06-03 | 2012-02-15 | 中国兵器工业第二〇五研究所 | Resolving power measuring device and resolving power evaluation method for three-generation dim light image intensifier |
| CN104614154A (en) * | 2015-02-03 | 2015-05-13 | 南京理工大学 | Testing device for radiation luminance gain of ultraviolet image intensifier |
| CN104990688A (en) * | 2015-06-29 | 2015-10-21 | 南京理工大学 | Double-light-path image intensifier signal to noise ratio testing device |
| CN105319052A (en) * | 2015-11-30 | 2016-02-10 | 武汉光驰科技有限公司 | Low-light-level image intensifier characteristic test system |
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| 孙宇楠: ""微光像增强器信噪比校准装置校准技术研究"", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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| CN110244037A (en) * | 2019-07-01 | 2019-09-17 | 北京乐普医疗科技有限责任公司 | A kind of chemiluminescence detection mould group |
| CN110244037B (en) * | 2019-07-01 | 2024-05-31 | 北京乐普诊断科技股份有限公司 | Chemiluminescent detection module |
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