CN1205497C - Optical system for infrared focal plane imaging - Google Patents
Optical system for infrared focal plane imaging Download PDFInfo
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- CN1205497C CN1205497C CN 01112711 CN01112711A CN1205497C CN 1205497 C CN1205497 C CN 1205497C CN 01112711 CN01112711 CN 01112711 CN 01112711 A CN01112711 A CN 01112711A CN 1205497 C CN1205497 C CN 1205497C
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- lens
- millimeters
- optical system
- focal plane
- infrared
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Abstract
The present invention discloses an optical system used for infrared focal plane imaging, which comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with a positive focal power, a Dewar window, a hole diameter diaphragm and a focal plane detector from an object to an image in sequence. The optical system takes a cold diaphragm of a detector as the hole diameter diaphragm. The first lens, the third lens and the Dewar window are made of Ge material with minor dispersion, and the second lens is made of infrared glass with larger dispersion. The work wave range of the optical system is from 7 to 11 microns, the relative aperture is 1: 2, the focal length is 25 millimeters, and the view field is 28 degrees. The optical system can effectively suppress stray light and heat radiation in a lens barrel influencing the detector performance.
Description
Technical field
The present invention relates to optical element, system or instrument, especially for the optical system of infrared focal plane imaging.
Background technology
The aperture diaphragm of optical system generally all is positioned on first lens of optical system inside or optical system, and this aberration to correcting optical system is all favourable with the size that reduces optical system.Simultaneously, the choice of location of aperture diaphragm also can be used as a kind of means of axis calibration exterior point aberration.Infrared optical system is no exception certainly, and the aperture diaphragm of general one chip and multiple-piece infrared objective also all is positioned on first lens of the inside of object lens or object lens.Referring to " infrared optical system design ", Zhao Xiuli writes, and the 303rd～339 page, China Machine Press published in 1986 years.
In the infrared imaging system that adopts infrared focal plane detector, for fear of parasitic light and the radiation of lens barrel internal heat influence to infrared focal plane detector, improve its detection performance, in the Dewar of infrared focal plane detector, designed cold stop (cold shield).And the existing optical system that is used for infrared focal plane imaging the time is still continued to use the design proposal of traditional infrared optical system in design, is still aperture diaphragm is placed on first lens of the inside of object lens or object lens.Specifically referring to " infrared optical system design ", Zhao Xiuli writes, and the 364th～366 page, China Machine Press published in 1986 years.This design proposal does not make the performance of infrared focal plane detector get a desired effect, the heat radiation of parasitic light and lens barrel inside still can enter infrared focal plane detector, thereby increase the noise of infrared focal plane detector, and can not all enter infrared focal plane detector from the target infrared radiation, reduced the signal of target.Like this, will reduce the performance of infrared focal plane detector.
Summary of the invention
The purpose of this invention is to provide and a kind ofly under the situation of object lens of large relative aperture, big visual field, still can obtain good picture element, and the cold stop that makes infrared focal plane detector can suppress parasitic light and the radiation of lens barrel internal heat, with the optical system of the superperformance that guarantees infrared focal plane detector.
The objective of the invention is to reach like this: the optical system that is used for infrared focal plane imaging is made up of first lens, second lens, the 3rd lens, dewar window, aperture diaphragm and infrared focal plane detector in order from object space to picture side.This optical system with the cold stop of infrared focal plane detector as its aperture diaphragm.Light beam from object space sees through first lens 1, second lens 2, the 3rd lens 3, dewar window 4 successively, passes aperture diaphragm 5, imaging on infrared focal plane detector 6.Three lens and dewar window adopt two kinds of different optical materials, so that color difference eliminating, first lens 1, the 3rd lens 3 and dewar window 4 are made by germanium material, and second lens 2 be the AMTIR1 infrared glass of U.S. Amorphous Materials Inc. production.Three lens all are meniscus lens, and first lens 1 and the 3rd lens 3 are positive light coke, bend towards picture side, and second lens 2 are negative power, bend towards object space, and dewar window 4 is a parallel flat.The chromatic dispersion of germanium is less, and the chromatic dispersion of AMTIR1 infrared glass is bigger.Second lens 2 of negative power adopt the bigger AMTIR1 infrared glass of chromatic dispersion, and the negative aberration of generation can be offset first lens 1 of positive light coke and the positive aberration sum that the 3rd lens 3 are produced.
Because the aperture diaphragm of optical system of the present invention and the cold stop of infrared focal plane detector overlap on position and size fully, be optical system with the cold stop of infrared focal plane detector be its aperture diaphragm, feasible infrared radiation by optical system all enters infrared focal plane detector, stoped parasitic light to enter effectively, thereby given full play to the benefit of cold stop, guaranteed the superperformance of infrared focal plane detector.
The present invention has following good effect:
The service band of optical system of the present invention is 7～11 microns, and relative aperture is 1: 2, and focal length is 25 millimeters, and the visual field is 28 °, and picture element is near diffraction limit.
Description of drawings
Fig. 1 is a kind of structural representation that is used for the optical system of infrared focal plane imaging of the present invention.There is shown first lens 1, second lens 2, the 3rd lens 3, dewar window 4, aperture diaphragm 5 and infrared focal plane detector 6.
Fig. 2 is a modulation transfer function (MTF) curve map of the present invention.There is shown 0 ° of visual field of the embodiment of the invention, 14 ° of visual fields, 20 ° of visual fields and 28 ° of visual fields to spatial frequency 0～20 line right/the MTF curve of millimeter and the MTF curve of diffraction limit as a comparison, T is a meridian direction among the figure, S is that arc shows direction.
Embodiment
In conjunction with the accompanying drawings, the inventor recommends embodiment as shown in table 1.
Table 1
Element title face sequence number radius-of-curvature (milli interval or thickness clear aperature material
Rice) (millimeter) (millimeter)
Convex surface R1 48.87
First lens, 4.00 Φ, 32 germanium
Concave surface R2 54.95
5.64 air
Concave surface R3-41.02
Second lens, 5.00 Φ, 30 AMTIR1
Convex surface R4-62.95
20.13 air
Convex surface R5 30.48
The 3rd lens 3.00 Φ 22 germanium
Concave surface R6 50.00
5.57 air
Frontal plane R7 plane
Dewar window 2.50 Φ 14 germanium
Back plane R8 plane
3.74 air
Aperture diaphragm R9 plane Φ 6
11.57 air
Focal plane detection R10 plane
Device
Claims (2)
1. an optical system that is used for infrared focal plane imaging comprises first lens, second lens, the 3rd lens, dewar window, aperture diaphragm and infrared focal plane detector, it is characterized in that:
Said optical system is made up of first lens, second lens, the 3rd lens, dewar window, aperture diaphragm and infrared focal plane detector to picture side in order from object space, this optical system with the cold stop of infrared focal plane detector as its aperture diaphragm; Light beam from object space sees through first lens (1), second lens (2), the 3rd lens (3), dewar window (4) successively, passes aperture diaphragm (5), goes up imaging at infrared focal plane detector (6); First lens (1), the 3rd lens (3) and dewar window (4) are made by the less germanium material of chromatic dispersion, the AMTIR1 infrared glass that second lens (2) adopt the bigger U.S. AmorphousMaterials Inc. of chromatic dispersion to produce; Three lens all are meniscus lens, and first lens (1) and the 3rd lens (3) are positive light coke, bend towards picture side, and second lens (2) are negative power, bend towards object space, and dewar window (4) is a parallel flat.
2. according to a kind of optical system that is used for infrared focal plane imaging of claim 1, it is characterized in that:
The radius-of-curvature of the convex surface R1 face of said first lens (1) is 48.87 millimeters, and the radius-of-curvature of concave surface R2 face is 54.95 millimeters, and center thickness is 4.00 millimeters, and clear aperature is 32 millimeters of Φ, and material is a germanium; The radius-of-curvature of the concave surface R3 face of second lens (2) is-41.02 millimeters, and the radius-of-curvature of convex surface R4 face is-62.95 millimeters, and center thickness is 5.00 millimeters, and clear aperature is 30 millimeters of Φ, and material is the AMTIR1 infrared glass; Be spaced apart 5.64 millimeters between first lens (1) and second lens (2), material is an air; The radius-of-curvature of the convex surface R5 face of the 3rd lens (3) is 30.48 millimeters, and the radius-of-curvature of concave surface R6 face is 50.00 millimeters, and center thickness is 3.00 millimeters, and clear aperature is 22 millimeters of Φ, and material is a germanium; Be spaced apart 20.13 millimeters between second lens (2) and the 3rd lens (3), material is an air; The front surface R7 of dewar window (4) and rear surface R8 are the planes, and thickness is 2.50 millimeters, and clear aperature is 14 millimeters of Φ, and material is a germanium; Be spaced apart 5.57 millimeters between the 3rd lens (3) and the dewar window (4), material is an air; The clear aperature of aperture diaphragm (5) is 6 millimeters of Φ, is spaced apart 3.74 millimeters between dewar window (4) and the aperture diaphragm (5), and material is an air; Be spaced apart 11.57 millimeters between aperture diaphragm (5) and the infrared focus plane (6), material is an air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01112711 CN1205497C (en) | 2001-04-25 | 2001-04-25 | Optical system for infrared focal plane imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01112711 CN1205497C (en) | 2001-04-25 | 2001-04-25 | Optical system for infrared focal plane imaging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1327164A CN1327164A (en) | 2001-12-19 |
| CN1205497C true CN1205497C (en) | 2005-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01112711 Expired - Fee Related CN1205497C (en) | 2001-04-25 | 2001-04-25 | Optical system for infrared focal plane imaging |
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| CN (1) | CN1205497C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614834B (en) * | 2009-07-24 | 2011-09-14 | 中国科学院上海技术物理研究所 | Cold diaphragm with light blocking ring structure |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694539B (en) * | 2009-10-21 | 2011-01-05 | 北京理工大学 | Two-color optical system with ultra-large vision field and large aperture |
| CN102681147A (en) * | 2011-02-22 | 2012-09-19 | 株式会社腾龙 | Infrared lens |
| CN102401981B (en) * | 2011-11-10 | 2013-06-12 | 河北汉光重工有限责任公司 | Total refraction passive athermal infrared double waveband lens |
| CN102967936B (en) * | 2012-11-27 | 2015-01-14 | 中国人民解放军92941部队 | Optical device for infrared dynamic tracking property test |
| CN103218042A (en) * | 2013-03-27 | 2013-07-24 | 苏州百纳思光学科技有限公司 | Far infrared gesture recognition device for portable electronic equipment |
| CN104155009A (en) * | 2014-07-28 | 2014-11-19 | 武汉振光科技有限公司 | Infrared optical system and infrared optical equipment |
| CN104535193A (en) * | 2014-12-22 | 2015-04-22 | 中国电子科技集团公司第十一研究所 | Infrared focal plane detector component |
| CN105044887B (en) * | 2015-06-02 | 2018-02-16 | 中国科学院上海技术物理研究所 | A kind of refrigeration mode object lens of large relative aperture ultra-wide angle infrared optical system |
| CN111623959B (en) * | 2020-05-21 | 2022-06-28 | 中国电子科技集团公司第十一研究所 | MTF test equipment for integrated optical lens group |
-
2001
- 2001-04-25 CN CN 01112711 patent/CN1205497C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614834B (en) * | 2009-07-24 | 2011-09-14 | 中国科学院上海技术物理研究所 | Cold diaphragm with light blocking ring structure |
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| Publication number | Publication date |
|---|---|
| CN1327164A (en) | 2001-12-19 |
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