CN205642622U - Thermal infrared divides aperture polarization imaging optics system - Google Patents
Thermal infrared divides aperture polarization imaging optics system Download PDFInfo
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- CN205642622U CN205642622U CN201620145908.6U CN201620145908U CN205642622U CN 205642622 U CN205642622 U CN 205642622U CN 201620145908 U CN201620145908 U CN 201620145908U CN 205642622 U CN205642622 U CN 205642622U
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Abstract
The utility model discloses a thermal infrared divides aperture polarization imaging optics system, it divides aperture formation of image mirror group including being total to aperture leading telescope group, is total to aperture relaying formation of image mirror group and infrared detector, divide aperture formation of image mirror group including four polarization passageways, place polarization device and a set of sub - lens group in proper order, their the polarization direction diverse to polarization information that can the detection of a target, divide that aperture formation of image mirror group becomes for instance through field lens adjustment back, be total to the secondary imaging of aperture relaying formation of image mirror group on the infrared detector focal plane. Because the branch aperture has the same optical characteristic, surveys when having realized different polarization state information to the formation of image is on same infrared detector's different zone simultaneously. The utility model provides an optical system image quality is good, and the polarization measurement precision is high, not influenced by external disturbance, can be applied to quick moving platform or detection quick change's target, compact structure, and no moving part has 100% cold light door screen efficiency.
Description
Technical field
This utility model relates to a kind of thermal infrared point aperture polarization imaging optical system, it is adaptable to polarization point aperture multi channel imaging system.
Background technology
The reflection of the detectable object of polarized imaging system or the polarization information of self radiation, polarization information can provide the multiple important physical messages such as the material surface attribute about object, roughness, shape, has broad application prospects in fields such as astronomical observation, medical diagnosis, remote sensing application and military identifications.
Polarization state typically by Stokes vector representation, in order to obtain complete Stokes Vector Message, at least needs the image obtaining four width about the different polarization states of target.Polarized imaging system currently mainly has timesharing detection system and detection system simultaneously, and timesharing detection system is by elements such as the introducing optical element such as rotatory polarization sheet or wave plate, position phase variable modulators, it is achieved the timesharing to different polarization states is measured.But the time delay during timesharing detection system is measured will necessarily introduce and changed by object or platform quickly moves caused error.Detection system used multichannel light splitting technology mainly has point amplitude techniques utilizing prism or beam splitter simultaneously, places point focal plane technology of integrated polarizing element, and place point aperture imaging technology of many subsystems on aperture at detector focal plane.Dividing amplitude techniques to use four optical systems and four Infrared Detectorss, the performance difference between different optical systems and detector can introduce measurement error, and point amplitude system bulk is bigger；Point focal plane technology is layout micropolarizer part at detector focal plane, and processing and manufacturing difficulty is very big, and Existential Space registration error；Point aperture system due to only with a detector, four tunnels divide aperture system simultaneously by each polarization state information imaging of object on the different surfaces of detector, there is the advantages such as volume compact, dependable performance, movement-less part.Existing thermal infrared divides aperture imaging technology (list of references J. Larry Pezzaniti and
David B. Chenault. Proc. of SPIE 58880. 2550.), farther out, and centre is equipped with multiple relaying camera lens, is not suitable for the infrared refrigeration photodetector of current encapsulated moulding in cold stop range finder focal plane.
Summary of the invention
The deficiency that this utility model exists for prior art, it is provided that a kind of volume compact, image quality is high, it is simple to data process, and works in point aperture imaging system for polarization imager of Thermal infrared bands, emergent pupil and detector cold stop accurate match.
For reaching above-mentioned purpose, the technical solution of the utility model is to provide a kind of thermal infrared point aperture polarization imaging optical system, and it includes common aperture preposition telescope group, point aperture imaging mirror group, altogether aperture relay imaging mirror group and Infrared Detectors；Described point aperture imaging mirror group includes the subchannel of four laid out in parallel, wherein, the structure of three subchannels is identical, is sequentially placed a polaroid, one group of passage object lens and one group of passage field lens along optical path direction, and the polaroid of three subchannels is polarized direction and is respectively 0 °, 45 ° and 90 °；4th subchannel is sequentially placed a uniform thickness identical material glass sheet, one group of passage object lens and one group of passage field lens along optical path direction；Described aperture relay imaging mirror group altogether includes common aperture relaying field lens and is total to aperture relay imaging mirror；Altogether aperture relay imaging mirror by target secondary imaging on the photosurface of Infrared Detectors.
Aperture preposition telescope group altogether described in the utility model, its focal length is 1.5:1～2.5:1 with the ratio of total focal length of optical system.Aperture preposition telescope group can be thermal infrared Galilean telescope or thermal infrared Kepler telescope altogether.
The focal length of the passage object lens in described in the utility model point of aperture imaging mirror group is 0.5:1～2:1 with the ratio of total focal length of optical system.Dividing the passage object lens in aperture imaging mirror group can be telephoto objective, or double separation object lens.
Aperture relay imaging mirror group altogether described in the utility model is three-chip type or double-Gauss objective.
Compared with prior art, advantage of the present utility model is:
1, use point aperture optical system to obtain each polarization state information of target simultaneously, and be imaged on same Infrared Detectors, compact conformation, good stability.
2, four points of aperture optical systems have identical optical texture characteristic, are not disturbed by factors such as external environments, and certainty of measurement is high.
3, have employed the optical system structure of secondary imaging, by aperture diaphragm secondary imaging in the position of cold stop, the advantage with common cold stop, it is ensured that the cold stop efficiency of 100%, accurately mate with detector cold stop.
4, four points of apertures after image planes by group aperture lens group imaging altogether after common on the detector, it is to avoid by the eccentric introduced image planes distortion in point aperture, picture element is good.
5, system camera lens all have employed conventional infra-red material, has relatively low processing and manufacturing cost.
Accompanying drawing explanation
Fig. 1 divides the structural representation of aperture polarized imaging system for the thermal infrared that this utility model embodiment provides；
Fig. 2 divides the modulation transfer function (MTF) curve chart of aperture polarized imaging system for the thermal infrared that this utility model embodiment provides；
Fig. 3 to Fig. 7 divides the point range figure of aperture polarized imaging system for the thermal infrared that this utility model embodiment provides；
Fig. 8 divides the mesh distortion figure of aperture polarized imaging system for the thermal infrared that this utility model embodiment provides；
Wherein: 1, aperture first piece of lens of preposition telescope group altogether, 2, aperture second piece of lens of preposition telescope group altogether, 3, aperture the 3rd piece of lens of preposition telescope group altogether, 4, aperture the 4th piece of lens of preposition telescope group altogether, 5, polaroid, 6, divide first piece of lens of aperture imaging mirror group, 7, divide second piece of lens of aperture imaging mirror group, 8, divide aperture field lens, 9, aperture relaying field lens altogether, 10, aperture first piece of camera lens of relay imaging mirror group altogether, 11, aperture second piece of camera lens of relay imaging mirror group altogether, 12, aperture the 3rd piece of camera lens of relay imaging mirror group altogether, 13, aperture the 4th piece of camera lens of relay imaging mirror group altogether, 14, aperture the 5th piece of camera lens of relay imaging mirror group altogether, 15, detector cold stop, 16, Infrared Detectors.
Detailed description of the invention
With embodiment, technical solutions of the utility model are further specifically described below in conjunction with the accompanying drawings.
Embodiment 1
The present embodiment provides a kind of thermal infrared to divide aperture polarization imaging optical system, and it includes common aperture preposition telescope group, point aperture imaging mirror group, altogether aperture relay imaging mirror group and Infrared Detectors.Point aperture set includes four channel of polarization, and each channel of polarization places a polarizer, a component aperture imaging mirror group respectively along optical path direction.Its service band is Thermal infrared bands, the focal length of camera lens be 68mm, F/# be 2, full filed is the visual field, face of 3.2 ° × 4 °.
See accompanying drawing 1, it is the structural representation of the optical lens that the present embodiment provides, aperture preposition telescope group can use thermal infrared Galilean telescope or thermal infrared Kepler telescope altogether, a concrete structure in the present embodiment includes 1, second piece of lens 2 of first piece of lens of common aperture preposition telescope group, the 3rd piece of lens 3 and the 4th piece of lens 4, and the focal length of aperture preposition telescope group is 1.5:1～2.5:1 with the ratio of total focal length of optical system altogether.
Aperture imaging mirror group is divided to include the subchannel of four laid out in parallel, wherein, the structure of three subchannels is identical, it is sequentially placed 5, one group of passage object lens of a polaroid along optical path direction and includes point first piece of lens of aperture imaging mirror group 6 and 7, one group of passage field lens 8 of second piece of lens, the polaroid of three subchannels is polarized direction and is respectively 0 °, 45 ° and 90 °, 4th subchannel along optical path direction be sequentially placed one with polaroid 5 uniform thickness identical material glass sheet, make up optical path difference to obtain the intensity signal of object, and one group of passage object lens and one group of passage field lens；Dividing the focal length of passage object lens in aperture imaging mirror group is 0.5:1～2:1 with the ratio of total focal length of optical system.
Incident illumination is after the preposition telescope group of common aperture, light line width is compressed and is limited visual field, enter a point aperture subsystem, after being placed the polaroid that difference is polarized direction, Polaroid at the relaying field lens 9 of common aperture by point aperture imaging mirror group, by common aperture relay imaging mirror group through detector cold stop 15, secondary imaging is on Infrared Detectors 16；Aperture relay imaging mirror group can be three-chip type or double-Gauss objective altogether, specifically includes 10, second piece of camera lens 11 of first piece of camera lens, the 3rd piece of camera lens 12, the 4th piece of camera lens 13 and the 5th piece of camera lens 14 in the present embodiment.Infrared Detectors can use gazing type infrared focal plane array seeker.
Point aperture optical system concrete data of each lens for thermal infrared polarization imaging that the present embodiment provides and the material used are shown in Table 1.
Table 1
。
Seeing accompanying drawing 2, it is the modulation transfer function (MTF) curve of system, and at nyquist frequency 32lp/mm, the MTF of system is more than 0.5, close to diffraction limit.
Seeing accompanying drawing 3-7, they are the point range figures in ray tracing image plane, and the circle in figure represents system diffraction Airy disk.In the range of each visual field point range figure energy all concentrates on Aili spot, there is good image quality.
Seeing accompanying drawing 8, it is grid distortion figure, and relative distortion is less than 1.13%, and maximum distortion amount is 20um, slightly larger than 1 pixel.The distortion that system exists can be corrected by image procossing.
Claims (7)
1. a thermal infrared divides aperture polarization imaging optical system, it is characterised in that: it includes common aperture preposition telescope group, point aperture imaging mirror group, altogether aperture relay imaging mirror group and Infrared Detectors；Described point aperture imaging mirror group includes the subchannel of four laid out in parallel, wherein, the structure of three subchannels is identical, is sequentially placed a polaroid, one group of passage object lens and one group of passage field lens along optical path direction, and the polaroid of three subchannels is polarized direction and is respectively 0 °, 45 ° and 90 °；4th subchannel is sequentially placed a uniform thickness identical material glass sheet, one group of passage object lens and one group of passage field lens along optical path direction；Described aperture relay imaging mirror group altogether includes common aperture relaying field lens and is total to aperture relay imaging mirror；Altogether aperture relay imaging mirror by target secondary imaging on the photosurface of Infrared Detectors.
A kind of thermal infrared the most according to claim 1 divides aperture polarization imaging optical system, it is characterised in that: described common aperture preposition telescope group, its focal length is 1.5:1～2.5:1 with the ratio of total focal length of optical system.
A kind of thermal infrared the most according to claim 1 and 2 divides aperture polarization imaging optical system, it is characterised in that: described common aperture preposition telescope group is thermal infrared Galilean telescope or thermal infrared Kepler telescope.
A kind of thermal infrared the most according to claim 1 divides aperture polarization imaging optical system, it is characterised in that: the described focal length of passage object lens in point aperture imaging mirror group is 0.5:1～2:1 with the ratio of total focal length of optical system.
5. divide aperture polarization imaging optical system according to a kind of thermal infrared described in claim 1 or 4, it is characterised in that: the described passage object lens in point aperture imaging mirror group are telephoto objective, or double separation object lens.
A kind of thermal infrared the most according to claim 1 divides aperture polarization imaging optical system, it is characterised in that: described common aperture relay imaging mirror group is three-chip type or double-Gauss objective.
A kind of thermal infrared the most according to claim 1 divides aperture polarization imaging optical system, it is characterised in that: described Infrared Detectors is gazing type infrared focal plane array seeker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620145908.6U CN205642622U (en) | 2016-02-28 | 2016-02-28 | Thermal infrared divides aperture polarization imaging optics system |
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| CN201620145908.6U CN205642622U (en) | 2016-02-28 | 2016-02-28 | Thermal infrared divides aperture polarization imaging optics system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588643A (en) * | 2016-02-28 | 2016-05-18 | 苏州大学 | Thermal infrared separate aperture polarization imaging optical system |
| CN108415144A (en) * | 2018-02-09 | 2018-08-17 | 中国科学院长春光学精密机械与物理研究所 | A kind of preposition camera lens of polarization imaging |
-
2016
- 2016-02-28 CN CN201620145908.6U patent/CN205642622U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588643A (en) * | 2016-02-28 | 2016-05-18 | 苏州大学 | Thermal infrared separate aperture polarization imaging optical system |
| CN105588643B (en) * | 2016-02-28 | 2018-03-23 | 苏州大学 | Thermal infrared divides aperture polarization imaging optical system |
| CN108415144A (en) * | 2018-02-09 | 2018-08-17 | 中国科学院长春光学精密机械与物理研究所 | A kind of preposition camera lens of polarization imaging |
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| AV01 | Patent right actively abandoned |
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