CN104503065A - Large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager - Google Patents
Large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager Download PDFInfo
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- CN104503065A CN104503065A CN201410821272.8A CN201410821272A CN104503065A CN 104503065 A CN104503065 A CN 104503065A CN 201410821272 A CN201410821272 A CN 201410821272A CN 104503065 A CN104503065 A CN 104503065A
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- biconvex lens
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- 230000003595 spectral effect Effects 0.000 title abstract 4
- 238000003384 imaging method Methods 0.000 claims abstract description 13
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 230000005499 meniscus Effects 0.000 claims description 23
- 230000000007 visual effect Effects 0.000 claims description 15
- 238000002211 ultraviolet spectrum Methods 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 22
- 230000004075 alteration Effects 0.000 description 11
- 238000013461 design Methods 0.000 description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000005350 fused silica glass Substances 0.000 description 7
- 238000012937 correction Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 241000700608 Sagitta Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000005331 crown glasses (windows) Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000005308 flint glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/143—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation for use with ultraviolet radiation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention relates to a large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager and belongs to the technical field of imaging. The large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager is sequentially provided with a first crescent lens, a second crescent lens, a first biconcave lens, an aperture diaphragm, a first biconvex lens, a second biconvex lens, a biconcave lens, a third biconvex lens and a third crescent lens, wherein all lenses are disposed on the same optical axis; the first crescent lens, the second crescent lens and the first biconcave lens form a front lens group to realize primary imaging, and a convergence surface is located on the aperture diaphragm; the first biconvex lens, the second biconvex lens, the second biconcave lens, the third biconvex lens and the third crescent lens form a rear lens group to perform secondary imaging to a converged ray surface of the aperture diaphragm, and an image is located on an image surface. The large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager has the advantages that the components are simple and easy to manufacture, the system is small in size, the tolerance is good, the assembling is facilitated, the imaging quality is excellent, the all-field-of-view full-waveband modulation transfer function value at Nyquist frequency of 1001p/mm is superior to 0.48, and the imaging distortion is lower than 0.5 percent.
Description
Technical field
The invention belongs to ultraviolet spectrum technical field of imaging, is a kind ofly under certain ultraviolet bandwidth, have the Large visual angle of superelevation spatial resolution, the optical spectrum imagers optical system of little F number.
Background technology
High spatial resolution ultraviolet spectrum Image-forming instrument has important effect in multiple research fields such as UV warning technology and ultraviolet atmospheric seeings.HIGH RESOLUTION ultraviolet spectrum Image-forming instrument can with the advantages such as low false alarm rate and high spatial coverage complete to missile threat quick, accurately locate, can help to improve the pre-alerting ability to closely short distance precision missile; Ultraviolet light between the gas meeting strong absorption 200nm ~ 300nm such as the ozone in air, by the lift-launch on space loading, this quasi-instrument can well carry out analysis remote sensing to Atmospheric components.But still there is following problem in existing ultraviolet spectrometer (UVS):
1, transmitting optical material is large in ultraviolet band dispersion, and range of choices is little, and Abbe number is close, and design system aberration is not easily eliminated;
2, Energy Transfer and signal to noise ratio (S/N ratio) require high, and therefore system F number is little; Require to cover visual field large simultaneously, thus cause axle is put aberration and off-axis point aberration effects greatly, image quality not easily improves;
3, limit by detector and F number, system focal length is less, and high spatial resolution realizes difficulty.
Summary of the invention
In order to solve problems of the prior art, the invention provides the ultrahigh resolution ultraviolet spectrum imager of a kind of Large visual angle, little F number, this spectrometer can guarantee the covering on a large scale of object scene in the scope of Large visual angle, ensure that not omitting of observation information, the little F number of system then can guarantee energy and the high s/n ratio of system transfers.
The technical scheme that technical solution problem of the present invention adopts is as follows:
A ultrahigh resolution ultraviolet spectrum imager for Large visual angle, little F number, this imager sets gradually the first meniscus lens 1, second meniscus lens 2, first biconcave lens 3, aperture diaphragm 4, first biconvex lens 5, second biconvex lens 6, biconcave lens 7, the 3rd biconvex lens 8 and the 3rd meniscus lens 9; All lens are placed with optical axis, and the first meniscus lens 1, second meniscus lens 2 and the first biconcave lens 3 form preset lens group, and scenery realizes Polaroid convergence to external world, and convergence plane is positioned on aperture diaphragm; First biconvex lens 5, second biconvex lens 6, second biconcave lens the 7, three biconvex lens 8 and the 3rd meniscus lens 9 form rear mirror group, and carry out secondary imaging to aperture diaphragm converging ray face, dispersion spectrum imaging is positioned in image planes.
The invention has the beneficial effects as follows: element of the present invention is simple and easy to processing and manufacturing, system bulk is little, system tolerance is good, be easy to assembling, image quality is superior, can be better than 0.48 by full filed all band modulating transfer function value when nyquist frequency is 100lp/mm, image deformation is lower than 0.5%.
Accompanying drawing explanation
The structural drawing of the ultrahigh resolution ultraviolet spectrum imager of a kind of Large visual angle of Fig. 1 the present invention, little F number;
MTF figure under the ultrahigh resolution ultraviolet spectrum imager full filed all band of a kind of Large visual angle of Fig. 2 the present invention, little F number;
The ultrahigh resolution ultraviolet spectrum imager curvature of field of a kind of Large visual angle of Fig. 3 the present invention, little F number and distortion figure.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
The invention belongs to spectral imaging technology field, is a kind of imaging spectrography system architecture that can obtain scenery ultraviolet fine image in different resolution on a large scale under certain ultraviolet bandwidth.Ingredient in this structure comprises: the first meniscus lens 1, second meniscus lens 2, first biconcave lens 3, aperture diaphragm 4, the first biconvex lens 5, second biconvex lens 6, second biconcave lens the 7, three biconvex lens the 8, three meniscus lens 9 and image planes 10.First meniscus lens 1, second meniscus lens 2 first and biconcave lens 3 form preset lens group, and scenery realizes Polaroid convergence to external world, and convergence plane is positioned on aperture diaphragm; First biconvex lens 5, second biconvex lens 6, second biconcave lens 7, second biconvex lens 8 and the 3rd meniscus lens 9 form rear mirror group, and carry out secondary imaging to aperture diaphragm converging ray face, gained light spectrum image-forming is positioned in image planes 10.
The present invention completes the design to each element in system by the analysis distributed research and the system focal power of imaging aberration theory.
On systematic lectotype, the field angle that reflect system and refraction-reflection type system are difficult to reach required covers, and catoptron is not easily processed, and cost is higher, and therefore system configuration have selected transmissive system.Available ultraviolet CCD pixel number is 1024 × 1024, and pixel size is 25.6 microns, is under the demand of 40 ° in visual field, and the focal length calculated needed for system is 36mm, retains certain surplus and gets 38mm; When the physical dimension of guarantee system is less and weight is less, Entry pupil diameters is not more than 12mm, and therefore system F number is chosen to be 3.5.
When ultraviolet band is applied, the alternate material of ultraviolet spectrum imaging transmissive system is less, under the requirement having high energy transmission and high s/n ratio performance, just more limit selecting of ultraviolet lens material, common crown glass and flint glass all very low at ultraviolet permeability, consider physicochemical property and the processing characteristics of material, alternate material just only has 3 ~ 5 kinds.In order to realize the distribution of the focal power of system, needing the material that positive lens Abbe number is high, the material that negative lens Abbe number is low, considering from the easy application of engineering ease for use and material, have finally chosen fused quartz and calcium fluoride bi-material.
The basic system that invention adopts is double-gauss lens system, former double-gauss lens system is made up of supplementary lens group and rearmounted lens combination, two groups of lens combination are made up of three spherical lenses separately respectively, and supplementary lens group has negative power, and rearmounted lens combination has positive light coke.Invent mainly through carrying out material change to two lens combination, radius-of-curvature changes and the focal power of system has been redistributed in the increase of number of lenses, have modified higher order aberratons amount and the aberration of system, achieve the optimization of picture element.
As shown in Figure 1, the radius-of-curvature of the first meniscus lens 1, first from the improvement of preposition lens combination, in order to meet the requirement of 40 ° of visual fields, strengthens by design.At ultraviolet band, lens material does not use gluing method usually, and especially in the system with high performance index designing requirement, the design objective of ultraviolet optics glue meeting influential system, therefore needs the rear two panels gummed mirror in preset lens group to take apart; Optional uv materials is fused quartz and calcium fluoride, and the Abbe number of bi-material is more close, and therefore Polaroid in order to what ensure at aperture diaphragm place, these two panels lens need to pull open certain distance; Simultaneously, calcium fluoride has the characteristic of halid easy deliquescence and vulnerable to pollution, therefore the first meniscus lens 1 can not use calcium fluoride, here the first meniscus lens 1 material is elected as fused quartz, second meniscus lens 2 material is calcium fluoride, first biconcave lens 3 material is fused quartz, and this Material selec-tion is conducive to the correction of the senior amount of aberration.
The rearmounted mirror group of double-gauss lens system is typical three-chip type, and the dominant aberration in order to picture element of eliminating the effects of the act comprises the curvature of field, spherical aberration and ratio chromatism, etc., needs to increase eyeglass and redistributes focal power.Comparatively responsive to the correction of ratio chromatism, owing to adding eyeglass conversion glass from diaphragm far-end, we consider pressing close to diaphragm place increase eyeglass, because last a slice first biconcave lens 3 of front end mirror group have selected fused quartz, the first biconvex lens 5 material selection of therefore increasing calcium fluoride is with the positive-negative relationship between the lens of satisfied front and back; In order to the senior amount of further aberration correction, before and after usual needs increase, the interval of group reduces the drift angle of rear group, increase to reduce to widen the volume brought at interval in invention, increase by the second biconvex lens 6 again after first biconvex lens 5 that can increase in rearmounted mirror group, material selects calcium fluoride equally, this reduces the senior aberration amount of system, ensure that the further correction of spherical aberration.In rearmounted lens combination, the second biconcave lens 7 material is fused quartz, 3rd biconvex lens 8 material is calcium fluoride, last a slice the 3rd meniscus lens 9 has carried out the improvement of form in former double-gauss lens system, changes the radius-of-curvature direction of its transmission plane, and Material selec-tion is fused quartz.
Fig. 2 gives the full filed all band modulating transfer function value figure of design system.This functional value comprehensively reflects the design evaluatio result of system.Have selected 10 ° of half field-of-views, 14 ° of half field-of-views and 20 ° of half field-of-views to carry out trace in figure.Wherein solid line represents meridian direction modulating transfer function value, represented by dotted arrows sagitta of arc direction transfer function values.Can see, along with the increase of visual field, modulating transfer function value is declining gradually.Wherein peripheral field i.e. 20 ° of half field-of-views 100lp/mm nyquist frequency (namely in figure spatial frequency week/mm) under be better than 0.48, design system all achieves extraordinary image quality in full filed all band.
Fig. 3 gives the curvature of field and the distortion figure of design system, have selected centre wavelength and the analysis of two edge wave progress row in figure.The meridian direction of the represented by dotted arrows curvature of field, solid line represents the sagitta of arc direction of the curvature of field.In curvature of field display, the wavelength producing the maximum curvature of field is edge wavelength 280nm, and defocusing amount is about 0.056mm; And in distortion display, the maximum distortion of system is lower than 0.5%, and these Confirmation Of Number systems reach good distortion and curvature of field design con-trol result.
Claims (2)
1. the ultrahigh resolution ultraviolet spectrum imager of a Large visual angle, little F number, it is characterized in that, this imager sets gradually the first meniscus lens (1), the second meniscus lens (2), the first biconcave lens (3), aperture diaphragm (4), the first biconvex lens (5), the second biconvex lens (6), the second biconcave lens (7), the 3rd biconvex lens (8) and the 3rd meniscus lens (9); All lens are placed with optical axis, the first meniscus lens (1), the second meniscus lens (2) and the first biconcave lens (3) composition preset lens group, and scenery realizes Polaroid convergence to external world, and convergence plane is positioned on aperture diaphragm; First biconvex lens (5), second biconvex lens (6), second biconcave lens (7), 3rd biconvex lens (8) and the rear mirror group of the 3rd meniscus lens (9) composition, carry out secondary imaging to aperture diaphragm converging ray face, gained light spectrum image-forming is positioned in image planes (10).
2. the ultrahigh resolution ultraviolet spectrum imager of a kind of Large visual angle as claimed in claim 1, little F number, it is characterized in that, the service band of described imager is 240nm ~ 280nm, 40 °, full observation visual field, system focal length is 38mm, F number is 3.5, and full filed all band modulating transfer function value can reach more than 0.48 under the nyquist frequency of 100lp/mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410821272.8A CN104503065B (en) | 2014-12-25 | 2014-12-25 | A kind of big visual field, the ultrahigh resolution ultraviolet spectra imager of little F numbers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410821272.8A CN104503065B (en) | 2014-12-25 | 2014-12-25 | A kind of big visual field, the ultrahigh resolution ultraviolet spectra imager of little F numbers |
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| Publication Number | Publication Date |
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| CN104503065A true CN104503065A (en) | 2015-04-08 |
| CN104503065B CN104503065B (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410821272.8A Expired - Fee Related CN104503065B (en) | 2014-12-25 | 2014-12-25 | A kind of big visual field, the ultrahigh resolution ultraviolet spectra imager of little F numbers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188651A (en) * | 2018-09-28 | 2019-01-11 | 长春长光瑞实科技有限公司 | A kind of refraction type high-resolution optical system of star sensor |
| CN110941086A (en) * | 2019-12-19 | 2020-03-31 | 福建福光股份有限公司 | Ultra-short low-distortion shimmer imaging optical system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3832037A (en) * | 1971-12-08 | 1974-08-27 | Olympus Optical Co | Super wide-angle lens systems |
| US3975091A (en) * | 1974-04-25 | 1976-08-17 | Asahi Kogaku Kogyo Kabushiki Kaisha | Wide angle photographic lens |
| CN1164033A (en) * | 1996-03-29 | 1997-11-05 | 三星航空产业株式会社 | Wide-angle photographic lens system |
| CN1920608A (en) * | 2006-09-11 | 2007-02-28 | 中国科学院上海技术物理研究所 | Ultraviolet object lens in aperture wide wave range for ultraviolet detection |
| KR20100124641A (en) * | 2009-05-19 | 2010-11-29 | 주식회사 나노포토닉스 | Fisheye lens |
-
2014
- 2014-12-25 CN CN201410821272.8A patent/CN104503065B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3832037A (en) * | 1971-12-08 | 1974-08-27 | Olympus Optical Co | Super wide-angle lens systems |
| US3975091A (en) * | 1974-04-25 | 1976-08-17 | Asahi Kogaku Kogyo Kabushiki Kaisha | Wide angle photographic lens |
| CN1164033A (en) * | 1996-03-29 | 1997-11-05 | 三星航空产业株式会社 | Wide-angle photographic lens system |
| CN1920608A (en) * | 2006-09-11 | 2007-02-28 | 中国科学院上海技术物理研究所 | Ultraviolet object lens in aperture wide wave range for ultraviolet detection |
| KR20100124641A (en) * | 2009-05-19 | 2010-11-29 | 주식회사 나노포토닉스 | Fisheye lens |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188651A (en) * | 2018-09-28 | 2019-01-11 | 长春长光瑞实科技有限公司 | A kind of refraction type high-resolution optical system of star sensor |
| CN109188651B (en) * | 2018-09-28 | 2023-10-20 | 长春长光瑞实科技有限公司 | Refractive high-resolution star sensor optical system |
| CN110941086A (en) * | 2019-12-19 | 2020-03-31 | 福建福光股份有限公司 | Ultra-short low-distortion shimmer imaging optical system |
| CN110941086B (en) * | 2019-12-19 | 2021-12-28 | 福建福光股份有限公司 | Ultra-short low-distortion shimmer imaging optical system |
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| CN104503065B (en) | 2017-04-05 |
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Granted publication date: 20170405 Termination date: 20191225 |