CN103197403B - Aperture-divided optical lens for polarization imager - Google Patents
Aperture-divided optical lens for polarization imager Download PDFInfo
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- CN103197403B CN103197403B CN201310149632.XA CN201310149632A CN103197403B CN 103197403 B CN103197403 B CN 103197403B CN 201310149632 A CN201310149632 A CN 201310149632A CN 103197403 B CN103197403 B CN 103197403B
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Abstract
The invention discloses an aperture-divided optical lens for a polarization imager. The aperture-divided optical lens comprises a common aperture lens group, a divided aperture group and a detector, wherein the common aperture lens group comprises two groups of lenses with positive focal power; and the divided aperture group comprises four polarization channels with same structures, wherein each polarization channel comprises a group of polarization analysis elements and a sub-lens group, the polarization analysis elements are arranged in front of the sub-lens group, and each group of polarization analysis elements comprises polarization plates and quarter-wave plates. According to the aperture-divided optical lens, light splitting and imaging can be simultaneously realized through an eccentric aperture dividing scheme, and the four aperture-divided lens groups have the same optical properties without being interfered by external environmental disturbance; the aperture-divided optical lens is high in polarization measuring precision and can be used for detecting moving or changed objects or can be used for environments in which the detector moves and the like. The polarization property of the object can be acquired with a high speed by once imaging; in addition, four intensity images with different polarization states can be acquired by one CCD (Charge Coupled Device); and the aperture-divided optical lens has the advantages of compact structure, small size, good stability and the like.
Description
Technical field
The present invention relates to a kind of point aperture Multi-channel optical camera lens, in particular for point aperture Multi-channel optical camera lens of polarization imaging.
Background technology
Polarization image information provides target surface characteristic, shape, cover and the physical features such as roughness.Utilize polarization imaging remote sensing to strengthen target detection, identifiable design tradition remote sensing technology is difficult to the target detected, thus has a wide range of applications at numerous areas such as the detection of remote optical sensing, biology and medical science, astronomy and space explorations.
Polarization state, generally by Stokes vector representation, for obtaining complete Stokes polar plot, at least needs the intensity image of the four width different polarization states obtaining same target.And the measurement of Stokes parameter must to identical target, the polarization characteristic gathering ability true reflection detected target under identical lighting condition with identical parameter detector setting model.Therefore carrying out imaging to the target of motion or change, and detector in case of motion, needs the Multi-channel optical camera lens being obtained four width images by single exposure.The hyperchannel light splitting technology that can realize polarized imaging system completely simultaneously at present mainly contains point amplitude techniques adding prism or beam splitter in the optical path, aperture is placed point aperture technique that multichannel divides photonic system, and in focal plane, integrated micro-polarizer divides focal plane technology and adopts the technical schemes such as polarization interference type light splitting technology.Amplitude polarized imaging system is divided to adopt four cover optical subsystems and four ccd detectors (see document Fujitaa K, Nishidaa M, Itoha Y, et al. Development of simultaneous imaging polarimeter. Proc. of SPIE. 6269. 2006.), system bulk is comparatively large, and optical system and CCD performance is inconsistent causes polarimetry error.While point focal plane, polarization imaging technology needs at the integrated micro-polaroid of focus planardetector and microwave chip arrays (see document Nordin G P, Meier J T, Deguzman P C, et al. Micropolarizer array for infrared imaging polarimetry [J]. J. Opt. Soc. Am. A. 1999.), and with current manufacture craft, manufacture be applicable to micro-polaroid of visible light wave range and microwave sheet more difficult.Polarization interference type light splitting technology, multichannel polarization image information in employing Fourier transform extraction interferogram is (see document Oka K. Compact complete imaging polarimeter using birefringent wedge prisms. OPTICS EXPRESS. 2003,11 (13): 1510-1519.), its image real time transfer is complicated, and Real-Time Monitoring speed is subject to the impact of image processing speed.The example (see document J. Larry Pezzaniti and David B. Chenault. Proc. of SPIE 58880. 2005.) of existing point of aperture system works in infrared band, this system is after the focal plane of front imaging len, place the relaying camera lens of re-imaging before dividing aperture lens group, system architecture is more complicated.
Summary of the invention
For overcoming the deficiency that prior art exists, the invention provides a kind of point aperture optical camera lens for polarization imager that a kind of compact conformation, image quality are high, be convenient to image real time transfer.
For achieving the above object, the technical solution used in the present invention is to provide a kind of point aperture optical camera lens for polarization imager, and it comprises common aperture lens group, point aperture set and imaging detector; It is positive camera lens that described common aperture lens group comprises two groups of focal powers; A described point aperture set comprises and has mutually isostructural four channel of polarization, each channel of polarization comprises one group of polarization analysis element and a sub-lens group, before described polarization analysis element is positioned over sub-lens group, often organize polarization analysis element and comprise polaroid and quarter-wave plate, be followed successively by quarter-wave plate, polaroid along optical path direction; Described four channel of polarization, quarter-wave plate fast axis direction wherein and polaroid polarization direction and horizontal direction angle are respectively (0 °, 0 °), (90 °, 90 °), (45 °, 45 °), (45 °, 0 °); Described imaging detector is placed in the common image planes position of four channel of polarization.
The focal length of aperture lens group altogether of the present invention is 1.5:1 ~ 3.0:1 with the ratio of the system focal length of camera lens.Altogether two groups of focal powers of aperture lens group are positive camera lens, and its front arrangement of mirrors head is air-spaced doublet group, rear arrangement of mirrors head for being separated three-chip type lens combination, also can be front arrangement of mirrors head for being separated three-chip type lens combination, rear arrangement of mirrors head is air-spaced doublet group.
The focal length of sub-lens group of the present invention is 1:2 ~ 2.5:1 with the ratio of the system focal length of camera lens.Sub-lens group is a three-chip type lens group, or a two separation lens group.
Imaging detector of the present invention is ccd detector or cmos detector.
Compared with prior art, advantage of the present invention is:
1, realize light splitting and imaging by eccentric point aperture schemes simultaneously, and adopt a CCD to obtain the intensity image of four width different polarization states, there is compact conformation, the advantages such as volume is little, good stability.
2, can the polarization characteristic of Polaroid acquisition target, speed is fast, can be used for the target detecting motion or change, or can be used for detector and be in the environment such as motion.
3, four points of sub-lens group in aperture have identical optical characteristics, and not by external environment disturbances, polarimetry precision is high.
4, can obtain polarization vector image by simple geometry computing, data processing is easy.
5, this camera lens adopts common Chinese glass and conventional polarizer, and cost is lower.
Accompanying drawing explanation
The index path dividing aperture optical camera lens for polarization imaging that Fig. 1 provides for the embodiment of the present invention 1;
The modulation transfer function curve map dividing aperture optical camera lens for polarization imaging that Fig. 2 provides for the embodiment of the present invention 1;
The point range figure that for polarization imaging divide aperture optical camera lens of Fig. 3 for providing for the embodiment of the present invention 1;
The mesh distortion figure dividing aperture optical camera lens for polarization imaging that Fig. 4 provides for the embodiment of the present invention 1;
The index path dividing aperture optical camera lens for polarization imaging that Fig. 5 embodiment of the present invention 2 provides;
Wherein, 1, lens group first lens before aperture altogether; 2, lens group second lens before aperture are total to; 3, lens group the 3rd lens before aperture are total to; 4, aperture rear lens group positive lens is total to; 5, aperture rear lens group negative lens is total to; 6, polarization analysis element; 7, aperture lens group first lens are divided; 8, divide aperture lens group second lens; 9, divide aperture lens group the 3rd lens; 10, imaging detector; 11, lens group first lens before aperture are total to; 12, lens group second lens before aperture are total to; 13, aperture rear lens group first lens are total to; 14, aperture rear lens group second lens are total to; 15, aperture rear lens group the 3rd lens are total to.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1:
The present embodiment provides a kind of point aperture optical camera lens for polarization imaging, it comprises common aperture lens group, point aperture set and detector, point aperture set comprises the identical channel of polarization of four structures, and each channel of polarization comprises one group of polarization analysis element and a sub-lens group.Its service band is 450 ~ 650nm, and the system focal length of camera lens is 40mm, F/#=4.5, and full filed angle is 5 degree.
See accompanying drawing 1, it is the index path of the optical lens that the present embodiment provides, this optical lens uses four kinds of Chinese glass altogether, be made up of the sub-lens group of common aperture lens group 5, polarization analysis element and point aperture set 3 × 4, by light direction, before being respectively lens group first lens 1 before common aperture, altogether aperture lens group second lens 2 and altogether before aperture lens group the 3rd lens 3 form lens group before aperture altogether; Aperture rear lens group positive lens 4, altogether aperture rear lens group negative lens 5 composition aperture rear lens group altogether altogether; Polarization analysis element 6, divide point aperture lens group that aperture lens group first lens 7, point aperture lens group second lens 8, point aperture lens group the 3rd lens 9 form, imaging detector 10 is placed in the common image planes of four channel of polarization, can be ccd detector or cmos detector.
Point concrete data of each lens of aperture optical camera lens for polarization imaging that the present embodiment provides and the material that adopts are in table 1.
Table 1
Each polarization analysis element in the present embodiment comprises a polaroid and a quarter-wave plate, be positioned in point aperture lens group respectively, along light transmition direction, quarter-wave plate is front, and polaroid is rear, and the quarter-wave plate fast axis direction in four polarization analysis elements and polaroid polarization direction and horizontal direction angle are respectively (0 °, 0 °), (90 °, 90 °), (45 °, 45 °), (45 °, 0 °); Detector can obtain the intensity map of four channel of polarization
i 1,
i 2,
i 3,
i 4.Utilize formula (1) that the Stokes vector of target can be obtained.
(1)
See accompanying drawing 2, it is the modulation transfer function (MTF) curve of system, and at nyquist frequency 60.24lp/mm place, the mtf value of system is greater than 0.75, close to diffraction limit.
See accompanying drawing 3, it be ray tracing as the point range figure in plane, the round representative system diffraction Airy disk in figure.The RMS radius value of each visual field point range figure is all less than 2.1 μm, and much smaller than the size of a pixel, system imaging quality is close to diffraction limit.
See accompanying drawing 4, it is grid distortion figure, and relative distortion is less than 0.82%, maximum distortion amount about 1 pixel dimension.In addition, the distortion that system exists can also pass through image processing correction.
Embodiment 2:
The present embodiment provides the another kind of structure of point aperture camera lens for polarization imaging.See accompanying drawing 5, it is the index path of the optical lens that the present embodiment provides, this optical lens uses three kinds of Chinese glass altogether, be made up of the sub-lens group of common aperture lens group 5, polarization analysis element and point aperture set 3 × 4, by light direction, be respectively by lens group, altogether aperture rear lens group first lens 13, altogether aperture rear lens group second lens 14 before lens group first lens before common aperture 11 and lens group second lens 12 form before aperture altogether common aperture and the common aperture rear lens group that forms of aperture rear lens group the 3rd lens 15 altogether; Polarization analysis element 6, point aperture lens group that point aperture lens group first lens 7, point aperture lens group second lens 8, point aperture lens group the 3rd lens 9 form, imaging detector 10 is placed in the common image planes of four channel of polarization.
Point concrete data of each lens of aperture optical camera lens for polarization imaging that the present embodiment provides and the material that adopts are in table 2.
Table 2:
。
Claims (6)
1., for a point aperture optical camera lens for polarization imager, it is characterized in that it comprises common aperture lens group, point aperture set and imaging detector; It is positive camera lens that described common aperture lens group comprises two groups of focal powers; A described point aperture set comprises and has mutually isostructural four channel of polarization, each channel of polarization comprises one group of polarization analysis element and a sub-lens group, before described polarization analysis element is positioned over sub-lens group, often organize polarization analysis element and comprise polaroid and quarter-wave plate, be followed successively by quarter-wave plate, polaroid along optical path direction; Described four channel of polarization, quarter-wave plate fast axis direction wherein and polaroid polarization direction and horizontal direction angle are respectively (0 °, 0 °), (90 °, 90 °), (45 °, 45 °), (45 °, 0 °); Described imaging detector is placed in the common image planes position of four channel of polarization; The focal length of described aperture lens group is altogether 1.5:1 ~ 3.0:1 with the ratio of the system focal length of camera lens.
2. a kind of point aperture optical camera lens for polarization imager according to claim 1, it is characterized in that: two groups of focal powers of described aperture lens group are altogether positive camera lens, its front arrangement of mirrors head is air-spaced doublet group, and rear arrangement of mirrors head is for being separated three-chip type lens combination.
3. a kind of point aperture optical camera lens for polarization imager according to claim 1, it is characterized in that: two groups of focal powers of described common aperture lens group are positive camera lens, its front arrangement of mirrors head is for being separated three-chip type lens combination, and rear arrangement of mirrors head is air-spaced doublet group.
4. a kind of point aperture optical camera lens for polarization imager according to claim 1, is characterized in that: the focal length of described sub-lens group is 1:2 ~ 2.5:1 with the ratio of the system focal length of camera lens.
5. a kind of point aperture optical camera lens for polarization imager according to claim 1, is characterized in that: described sub-lens group is a three-chip type lens group, or a two separation lens group.
6. a kind of point aperture optical camera lens for polarization imager according to claim 1, is characterized in that: described imaging detector is ccd detector or cmos detector.
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| CN201310149632.XA CN103197403B (en) | 2013-04-26 | 2013-04-26 | Aperture-divided optical lens for polarization imager |
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| CN201310149632.XA CN103197403B (en) | 2013-04-26 | 2013-04-26 | Aperture-divided optical lens for polarization imager |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105049690B (en) * | 2015-07-06 | 2017-06-09 | 中国科学院遥感与数字地球研究所 | Portable polarization digital camera and its imaging method |
| CN105352603B (en) * | 2015-11-13 | 2017-08-25 | 中国科学院西安光学精密机械研究所 | Polarization imaging system and method for simultaneous detection of full polarization state of aperture-dividing confocal plane |
| CN105588643B (en) * | 2016-02-28 | 2018-03-23 | 苏州大学 | Thermal infrared divides aperture polarization imaging optical system |
| CN110057754B (en) * | 2019-05-23 | 2024-04-19 | 南京信息工程大学 | Sub-aperture optical lens for underwater polarization imaging |
Citations (2)
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| CN102707452A (en) * | 2012-07-02 | 2012-10-03 | 北京理工大学 | Double separation wollaston prism high-resolution simultaneous polarization-imaging system |
| CN102944937A (en) * | 2012-11-27 | 2013-02-27 | 北京理工大学 | Sub-aperture polarization imaging system |
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| KR100315637B1 (en) * | 1999-03-31 | 2001-12-12 | 윤종용 | Optical system of DVD-ROM capable of play/record CD-RW |
| WO2006046465A1 (en) * | 2004-10-29 | 2006-05-04 | Konica Minolta Opto, Inc. | Objective lens, optical pickup, and optical disc drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707452A (en) * | 2012-07-02 | 2012-10-03 | 北京理工大学 | Double separation wollaston prism high-resolution simultaneous polarization-imaging system |
| CN102944937A (en) * | 2012-11-27 | 2013-02-27 | 北京理工大学 | Sub-aperture polarization imaging system |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2000-298871A 2000.10.24 * |
| 基于斯托克斯矢量的偏振成像仪器及其进展;刘敬等;《光学技术》;20130131;第39卷(第1期);第56-62页 * |
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