CN1352403A - Infrared double wave band refraction/diffraction mixed optical imaging system - Google Patents
Infrared double wave band refraction/diffraction mixed optical imaging system Download PDFInfo
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- CN1352403A CN1352403A CN 01132130 CN01132130A CN1352403A CN 1352403 A CN1352403 A CN 1352403A CN 01132130 CN01132130 CN 01132130 CN 01132130 A CN01132130 A CN 01132130A CN 1352403 A CN1352403 A CN 1352403A
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Abstract
An imaging optical system consists of front lens combination with diffraction element and rear lens combination, and features that the diffraction element is flashing binary one with double central wavelengths in both 3-5 micron band and 8-12 micron band. the imaging optical systme has high transmission efficiency, is simple in structure and may be used in airborne carrier and satellite based remote sensing infrared system and other fields.
Description
Technical field
The present invention relates to optical element, optical system, be specifically related to a kind of infrared double wave band refraction/diffraction mixed optical imaging system that is used for fields such as airborne or spaceborne infrared remote sensing.
Technical background
The two-waveband infrared optical imaging system is the object of domestic and international infrared optical system researchist research and development owing to have the characteristics of can be simultaneously 3-5 μ m and 8-12 mu m waveband being carried out imaging always.Owing to be subjected to the restriction of traditional infrared optical element performance, therefore traditional infrared optical system is difficult to must take special mode could realize dual-waveband imaging to 3-5 micron and the imaging simultaneously of two wave bands of 8-12 micron.The Kebo of the U.S., Reynold S. by method that adopt to insert the supplementary lens group on traditional infrared optical system, realizes to two waveband conversion imaging (European patent: EP:0367197 B1), imaging (BrP: GB 2299911A) when the HerbertMorrison Runciman of Britain inserts supplementary lens realization infrared double-waveband by beam splitting chip.
Along with going deep into of diffraction optical element research, roll over/spread out hybrid optical system and obtained research and development, the diffraction element technology has also obtained application in the dual-waveband imaging system, the Chipper of the U.S. and Robert B. have invented the folding/mixing dual-waveband imaging optical system of spreading out (United States Patent (USP): U.S.6,018,414), roll over/spread out in the front lens group that mixes the two waveband optical imaging system and the rear lens group at this and respectively adopted a diffraction element, successfully realized dual-waveband imaging.
Because the logical optical efficiency of diffraction element is that diffraction efficiency is relevant with wavelength, if depart from the center blaze wavelength of diffraction element, the diffraction efficiency of diffraction element just sharply descends, can realize dual-waveband imaging although therefore roll over the commingled system of spreading out, the diffraction element diffraction efficiency lowly is a problem that can not be ignored.
Summary of the invention
The objective of the invention is: the outer dual-waveband imaging optical system of the mixture of red of spreading out is rolled in design one, solves the low problem of above-mentioned two waveband optical system kind diffraction element diffraction efficiency by adopt the method for two center blaze wavelength diffraction elements in optical system.
Infrared double wave band refraction/diffraction mixed optical imaging system structure of the present invention as shown in Figure 1, with the conventional imaging system class seemingly, extremely picture side is in order by lens 1, lens 2, lens 3 and the binary diffraction element 4 of front lens group 8 from object space in system, and the lens 5 of rear lens group 7 are formed.The lens number of front lens group 8 is not limited to 3, can do necessary increase and decrease according to the imaging requirements of optical system, and the lens number of same rear lens group 7 not only is limited to lens, can do necessary increase according to the imaging requirements of optical system.Light beam from object space sees through lens 1, lens 2, lens 3, binary diffraction element 4 and lens 5 according to this, imaging on picture plane 6.Lens material must be all to be material transparent to two infrared bands, and at first preferable material should be that refractive index is at 3-5 μ m and the more approaching material of 8-12 mu m waveband, as Ge, GaAs, ZnS etc.Said binary diffraction element 4 is two centre wavelengths of the 3-5 μ m that makes of a germanium wafer and 8-12 mu m waveband binary diffraction elements that glitter.Two centre wavelengths binary diffraction element that glitters is several concentric circular regions by five equilibrium, two adjacent concentric circular regions are that the blaze wavelength of diffraction element is alternately arranged and constituted with the centre wavelength of 3-5 μ m and 8-12 mu m waveband respectively, its structure as shown in Figure 2, the centre wavelength of black collar region 9 expression 3-5 micron wavebands is blaze wavelength, and the centre wavelength of white collar region 10 expression 8-12 micron wavebands is blaze wavelength.According to this structure, can also make the binary diffractive optic element that two above centre wavelengths are glittered, on an optical system, just can realize the optical imagery of two above wave bands like this.
The invention has the advantages that: adopt the refraction/diffraction mixed optical system architecture to realize the two waveband optical imagery, simplified the structure of optical system, adopt two centre wavelengths binary diffractive optic element that glitters that the logical optical efficiency of system is significantly improved.
Description of drawings
Fig. 1 is the infrared double wave band refraction/diffraction mixed optical imaging system structural drawing, and 1 is first lens of front lens group 8 among the figure; 2 is second lens of front lens group 8; 3 is the 3rd lens of front lens group 8; 4 is the binary diffraction element of front lens group 8; 5 is the lens of rear lens group 7; 6 are the picture plane; 7 is front lens group; 8 is rear lens group.
Fig. 2 is two centers blaze wavelength diffraction element structural drawing, and 9 are black collar region (one centre wavelength being glittered at this area diffraction element) among the figure; 10 are white collar region (another centre wavelength being glittered at this area diffraction element).
Fig. 3 is a two waveband optical imaging system embodiment optical system optical transfer function curve.
Embodiment
The optical texture of infrared double wave band refraction/diffraction mixed optical imaging system shown in 1 with reference to the accompanying drawings, we design a spaceborne two-waveband infrared optical imaging system, and the specific targets of system are:
1. satellite altitude: 650Km;
2. ground resolution: 300m;
3. swath width: 720Km;
4. imaging wave band: 3.50～3.90 μ m and 10.5～12.5 μ m;
The double-colored device of detector: InSb/HgCdTe (cell size: 80 μ m * 80 μ m) according to the imaging system overall objective, we are at the technical parameter of two-waveband infrared optical system of design:
1. focal length: 173.3mm;
2. relative aperture: 1/2.5;
3. instantaneous field of view: 0.46mrad;
4. visual field: 0.5 °
Optical system specific design data such as following table 1, table 1 optical element title face sequence number radius-of-curvature interval or thickness material
(millimeter) (millimeter)
R11 201.093mm lens 1 12mm ZnSe
R12 424.034mm
1.0mm
R21 117.919mm lens 2 14.10mm Ge
R22 115.731mm
1.0mm
R31 110.234mm lens 3 10.66mm GaAs
R32 104.427mm
10mm diffraction element 4 2mm Ge
60mm
R51 42.561mm lens 5 12.09mm Ge
R52 29.134mm is as plane 6
37.154mm diffraction element 4 design parameters: φ (r)=-1020.299843r
2+ 653.6751r
4-386.305823r
6Optical system optical transfer function such as accompanying drawing 3.
Claims (2)
1. infrared double wave band refraction/diffraction mixed optical imaging system, system from object space to picture side in order by lens (1), lens (2), lens (3) and the binary diffraction element (4) of front lens group (8), lens (5) composition of rear lens group (7); The lens number of front lens group (8) is not limited to 3, can do necessary increase and decrease according to the imaging requirements of optical system, and the lens number of same rear lens group (7) not only is limited to 1 lens, can do necessary increase according to the imaging requirements of optical system; Light beam from object space sees through lens (1), lens (2), lens (3), binary diffraction element (4) and lens (5) according to this, goes up imaging on picture plane (6); It is characterized in that:
A. said binary diffraction element (4) is a binary diffraction element that two centre wavelengths are glittered, it is that several concentric circular regions by five equilibrium constitute, and two adjacent concentric circular regions are the blaze wavelength of diffraction element with the centre wavelength of 3-5 μ m and 8-12 mu m waveband respectively; According to this structure, can also make the binary diffractive optic element that two above centre wavelengths are glittered, on an optical system, just can realize the optical imagery of two above wave bands like this;
B. lens material must be all to be material transparent to two or two above infrared bands, and at first preferable material should be that refractive index is at 3-5 μ m and the more approaching material of 8-12 mu m waveband, as Ge, GaAs, ZnS etc.
2. according to claim 1. infrared double wave band refraction/diffraction mixed optical imaging system, it is characterized in that: the radius-of-curvature of the R11 face of said lens (1) is 201.093mm, and the radius-of-curvature of R12 face is 424.034mm, and the center is thick to be 12mm, and material is ZnSe; The radius-of-curvature of the R21 face of lens (2) is 117.919mm, and the radius-of-curvature of R22 face is 115.731mm, and the center is thick to be 14.10mm, and material is Ge; Be spaced apart 1.0mm between lens (1) and the lens (2), material is an air; The radius-of-curvature of the R31 face of lens (3) is 110.234mm, and the radius-of-curvature of R32 face is 104.427mm, and the center is thick to be 10.66mm, and material is GaAs; Be spaced apart 1.0mm between lens (2) and the lens (3), material is an air; The design parameter of diffraction element (4) be φ (r)=-1020.299843r
2+ 653.6751r
4-386.305823r
6, thickness is 2mm, material is Ge; Be spaced apart 10mm between lens (3) and the diffraction element (4), material is an air; The radius-of-curvature of the R51 face of lens (5) is 42.561mm, and the radius-of-curvature of R52 face is 29.134mm, and the center is thick to be 12.09mm, and material is Ge; Be spaced apart 60mm between diffraction element (4) and the lens (5), material is an air.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB01132130XA CN1180288C (en) | 2001-11-07 | 2001-11-07 | Infrared double wave band refraction/diffraction mixed optical imaging system |
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| CNB01132130XA CN1180288C (en) | 2001-11-07 | 2001-11-07 | Infrared double wave band refraction/diffraction mixed optical imaging system |
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| CN1352403A true CN1352403A (en) | 2002-06-05 |
| CN1180288C CN1180288C (en) | 2004-12-15 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100498414C (en) * | 2007-12-21 | 2009-06-10 | 中国科学院上海技术物理研究所 | Refraction-diffraction mixed telescope optical system |
| CN100580499C (en) * | 2007-11-21 | 2010-01-13 | 中国科学院上海技术物理研究所 | Refraction-reflection type dual-waveband imaging telescope optical system |
| CN101167008B (en) * | 2006-01-30 | 2010-05-26 | 住友电气工业株式会社 | Infrared lens, infrared camera and night vision |
| CN106483643A (en) * | 2016-11-28 | 2017-03-08 | 中山联合光电科技股份有限公司 | High-resolution, high illumination, the zoom infra-red thermal imaging system of big multiplying power |
| CN108780265A (en) * | 2016-03-15 | 2018-11-09 | 住友电气工业株式会社 | Infrared lenses component |
| CN110361849A (en) * | 2019-07-11 | 2019-10-22 | 长春理工大学 | Folding, which spreads out, mixes mobile lens |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915978B (en) * | 2010-08-05 | 2011-11-09 | 中国兵器工业第二〇五研究所 | Infrared optical lens comprising two layers of harmonic diffraction surfaces |
-
2001
- 2001-11-07 CN CNB01132130XA patent/CN1180288C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101167008B (en) * | 2006-01-30 | 2010-05-26 | 住友电气工业株式会社 | Infrared lens, infrared camera and night vision |
| CN100580499C (en) * | 2007-11-21 | 2010-01-13 | 中国科学院上海技术物理研究所 | Refraction-reflection type dual-waveband imaging telescope optical system |
| CN100498414C (en) * | 2007-12-21 | 2009-06-10 | 中国科学院上海技术物理研究所 | Refraction-diffraction mixed telescope optical system |
| CN108780265A (en) * | 2016-03-15 | 2018-11-09 | 住友电气工业株式会社 | Infrared lenses component |
| CN106483643A (en) * | 2016-11-28 | 2017-03-08 | 中山联合光电科技股份有限公司 | High-resolution, high illumination, the zoom infra-red thermal imaging system of big multiplying power |
| CN106483643B (en) * | 2016-11-28 | 2022-10-14 | 中山联合光电科技股份有限公司 | Zoom infrared thermal imaging system |
| CN110361849A (en) * | 2019-07-11 | 2019-10-22 | 长春理工大学 | Folding, which spreads out, mixes mobile lens |
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| Publication number | Publication date |
|---|---|
| CN1180288C (en) | 2004-12-15 |
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