CN209674115U - Reflective REAL TIME INFRARED THERMAL IMAGE polarizes double separate imaging optical systems - Google Patents
Reflective REAL TIME INFRARED THERMAL IMAGE polarizes double separate imaging optical systems Download PDFInfo
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- CN209674115U CN209674115U CN201920220116.4U CN201920220116U CN209674115U CN 209674115 U CN209674115 U CN 209674115U CN 201920220116 U CN201920220116 U CN 201920220116U CN 209674115 U CN209674115 U CN 209674115U
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Abstract
The utility model discloses a kind of reflective REAL TIME INFRARED THERMAL IMAGEs to polarize double separate imaging optical systems, comprising: Cassegrain's reflection subassembly, Wollaston prism, imaging infrared lens group and detector assembly；Cassegrain's reflection subassembly after compressing directional light, then by parallel light output, is incident on Wollaston prism；Wollaston prism, for directional light to be resolved into two beam polarised lights；Imaging infrared lens group, for by the convergence of two beam polarised lights and separate imaging is to detector assembly；Detector assembly, including detector image planes and the cold screen of detector, detector image planes are used to detect two width polarization images of two beam polarised lights formation, and the cold screen of detector is for reducing radiation.The utility model carries out ray-collecting using Cassegrain reflective system, can obtain more infrared energies；The two width polarization images that Same Scene can be obtained in real time using Wollaston prism are carried out Image Information Processing to the two width polarization image, target acquisition efficiency can be improved.
Description
Technical field
The utility model relates to Infrared Polarization Imaging Technology field more particularly to a kind of reflective REAL TIME INFRARED THERMAL IMAGE polarizations pair point
From imaging optical system.
Background technique
The imaging technique for detecting scenery optical polarization is exactly polarization imaging, and polarization imaging is with a wide range of applications,
Such as it detects the target hidden or pretended, realization and detects mesh to the detection and identification of small temperature-difference target, under the conditions of smoky environment
Mark etc..And with the development of photoelectric technology, various infrared camouflage measures are applied, and keep the infra-red radiation of target and background special
Property is changed, and is caused system to be interfered, is seriously affected the detectivity of infrared imaging detection system, limits conventional red
The performance of outer imaging system function.Infrared Polarization Imaging Technology is the rapid novel imaging technique of development abroad nearly ten years, together
The radiation intensity information and polarization degree information of Shi Liyong object scene, improve imaging system target in complex environment detection and
Recognition capability.In addition, for infrared imaging system, it is important that the target energy size obtained, acquisition
Target energy is more, and the transmitance of system is higher, and the efficiency of system is higher, and reflective system is compared to transmissive system,
There is wider material to select, and bigger bore can be processed to obtain higher energy, in infrared optical system
With more wide application prospect.
Traditional polarization imaging technology has certain defect, and there are mainly three types of a point polarization sides for traditional polarized imaging system
Formula, i.e. point amplitude mode divide aperture mode and polarization focal plane imaging mode, divide amplitude mode principle simple, but target is not
It timesharing must obtain, be easy in the process since environmental factor introduces error at identical conditions with polarized component；Divide aperture
Mode complexity is high, system is to noise-sensitive, detectivity is weaker；Polarization focal plane imaging mode key is detecting element
Manufacture craft, expensive and optical path is easy crosstalk；Second is that solving the defect of infrared transmission formula system, infrared transmission system
Selectable material is less, and processing bore is limited, and general bore is more than that the infrared transmission material of 100mm just will appear processing
The problems such as difficulty is big, bulking value is larger, and it is expensive, and reflective optical system can process very big bore, it is mature
Technology can process 200mm-400mm bore reflecting mirror, in addition infrared transmission material inevitably have transmitance loss and color difference
The defects of, reflective system is then due to the maturation of coating technique, and will not take very big energy loss and reflective system for system
System itself will not introduce color difference for optical path.In consideration of it, researching and analysing regarding to the issue above, there is this case generation then.
Utility model content
The utility model embodiment provides a kind of reflective double separate imaging optical systems of REAL TIME INFRARED THERMAL IMAGE polarization, to solve
Conventional polarization imaging system divides amplitude mode to be easy to introduce error due to environmental factor in the prior art；Divide aperture mode complexity
For high, system to noise-sensitive, detectivity is weaker；Polarize that focal plane imaging mode is expensive and optical path be easy crosstalk and
The big problem of heavy caliber infrared transmission material difficulty of processing.
The utility model embodiment provides a kind of reflective double separate imaging optical systems of REAL TIME INFRARED THERMAL IMAGE polarization, comprising: card
Fill in Green's reflection subassembly, Wollaston Wollaston prism, imaging infrared lens group and detector assembly；
Cassegrain's reflection subassembly, for it will be compressed from the directional light that its big incident bore receives after, from
Its small-bore output directional light, and it is incident on the Wollaston Wollaston prism；
The Wollaston Wollaston prism is being spatially separating and polarization state is mutual for resolving into the directional light
Two mutually orthogonal beam polarised lights；
The imaging infrared lens group, for will two beams polarised light convergence simultaneously separate imaging to detector assembly；
The detector assembly, including detector image planes and the cold screen of detector, the detector image planes are for detecting two
The two width polarization images that beam polarised light is formed, the cold screen of detector are used to reduce the stray radiation entered on detector assembly.
Preferably, Cassegrain's reflection subassembly specifically includes: the primary mirror and secondary mirror for being coaxially disposed and being arranged successively；
Wherein the primary mirror is quadratic surface, and the secondary mirror is aspherical.
Preferably, the Wollaston Wollaston prism isosceles right angle trigonometry prism mutually orthogonal by two blocks of optical axises
Crystal optical cement forms.
Preferably, the cold screen of the detector specifically includes:
Diaphragm is reduced spuious on refrigeration detector for guaranteeing the cold stop efficiency of the imaging optical system
Radiation.
Preferably, the Wollaston Wollaston prism material using magnesium fluoride or other with crystalline nature
Infra-red material.
Preferably, the Wollaston prism is specifically used for:
It is different by the direction of optic axis of two triangular prism grain boundary two sides, make incident ray when by cemented surface by seeking
Ordinary light makes the light of different direction of vibration that different foldings occur to the variation of abnormal light or by the variation of abnormal light to ordinary light
It penetrates, is formed in and is spatially separating and two beam polarised lights that polarization state is mutually orthogonal, the two beams polarised light angle β size are 2 (no-
ne), wherein noAnd neFor ordinary refraction index in crystal and abnormal optical index.
Using the utility model embodiment, reflective REAL TIME INFRARED THERMAL IMAGE provided by the utility model polarizes double separate imaging optics
System uses monochromatic light road polarization imaging mode, solves conventional polarization imaging system point amplitude mode and is easy since environmental factor is drawn
Enter error；Divide aperture mode complexity height, system to noise-sensitive, detectivity is weaker；Polarize focal plane imaging mode price
Expensive and optical path is easy crosstalk and the big problem of heavy caliber infrared transmission material difficulty of processing.The utility model uses card plug
Green's catoptric arrangement, monochromatic light road polarization imaging mode, front end carry out ray-collecting using Cassegrain reflective system, can obtain
More infrared energies；Polarization spectro is carried out to the light that Cassegrain system is emitted using Wollaston prism later, it can be real
When obtain two width polarization images of Same Scene, carry out Image Information Processing using two width polarization images of Same Scene, can be with
Improve target acquisition efficiency；Technical foundation is established in development for REAL TIME INFRARED THERMAL IMAGE polarization imaging and detection.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and being implemented in accordance with the contents of the specification, and in order to allow above and other purpose, feature of the utility model
It can be more clearly understood with advantage, it is special below to lift specific embodiment of the present utility model.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as practical to this
Novel limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is Wollaston prism structure schematic diagram provided by the embodiment of the utility model.
Fig. 2 is that the reflective double separate imaging optical system principles of REAL TIME INFRARED THERMAL IMAGE polarization provided by the embodiment of the utility model are shown
It is intended to.
Fig. 3 is that reflective REAL TIME INFRARED THERMAL IMAGE polarizes double separate imaging schematic diagram of optical system in the utility model embodiment；
Fig. 4 is Cassegrain's reflection subassembly schematic diagram in the utility model embodiment；
Fig. 5 is image-forming assembly schematic diagram in the utility model embodiment；
Fig. 6 is detector assembly and double separate imaging schematic diagrames in the utility model embodiment；
Fig. 7 is the modulation transfer function figure of polarised light 1 in the utility model embodiment；
Fig. 8 is the modulation transfer function figure of polarised light 2 in the utility model embodiment.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
The utility model embodiment provides reflective REAL TIME INFRARED THERMAL IMAGE and polarizes double separate imaging optical systems, such as Fig. 2, Fig. 3 institute
Show, comprising: Cassegrain's reflection subassembly 1, Wollaston Wollaston prism 2, imaging infrared lens group 3 and detector group
Part；
Cassegrain's reflection subassembly 1, for it will be compressed from the directional light that its big incident bore receives after, from
Its small-bore output directional light, and it is incident on the Wollaston Wollaston prism 2；
Wherein, Cassegrain's reflection subassembly 1 specifically includes: the primary mirror and secondary mirror for being coaxially disposed and being arranged successively；
Wherein the primary mirror is quadratic surface, and the secondary mirror is aspherical.
The Wollaston Wollaston prism 2 is being spatially separating and polarization state is mutual for resolving into the directional light
Two mutually orthogonal beam polarised lights；As shown in Figure 1, prism sharp angle α is 45 ° in Fig. 1, Wollaston Wollaston prism 2 utilizes boundary
The difference of face two sides direction of optic axis, the natural light for making normal incidence to prism surface AB resolve into ordinary light after entering left prism ABD
With abnormal light, their direction of vibration is respectively perpendicular to and is parallel to plan, therefore although their direction of propagation is consistent, right
The refractive index answered is not but identical, and the refractive index of ordinary light and abnormal light is respectively noAnd ne；Into after right prism ACD, perpendicular to figure
The vibration component of plane becomes abnormal light from ordinary light, and refractive index is by noBecome ne, light is by downward deviation, and it is flat to be parallel to figure
The vibration component in face becomes ordinary light from abnormal light, and refractive index is by neBecome no, the upward deviation of light；Final polarization direction is orthogonal
Two beam polarised lights occur space separation.Therefore, Ray Of Light is after being incident on Wollaston Wollaston prism 2, can be with
The two beams polarised light mutually orthogonal in the polarization state being spatially separating is generated simultaneously；
Wherein, noAnd neFor ordinary refraction index in crystal and abnormal optical index, two beam polarised light angle β sizes are 2
(no-ne)；
Wherein, the Wollaston Wollaston prism 2 is brilliant by the mutually orthogonal isosceles right angle trigonometry prism of two blocks of optical axises
Body optical cement forms, and its material uses magnesium fluoride or other infra-red materials with crystalline nature.
The imaging infrared lens group 3, for will two beams polarised light convergence simultaneously separate imaging to detector assembly,
Have two beam polarised lights spatially separated, as shown in Figure 6；
The detector assembly, including detector image planes 5 and the cold screen 4 of detector, the detector image planes 5 are for detecting
The two width polarization images that two beam polarised lights are formed, the cold screen 4 of detector are used to reduce the spuious spoke entered on detector assembly
It penetrates；
Wherein, detector assembly is infrared refrigeration mode detector, and the utility model embodiment mainly mentions refrigeration detector
Cold screen and detector image planes 5, do not repeated them here about the refrigeration machine of detector and circuit etc.；
Wherein, the cold screen 4 of the detector specifically includes:
Diaphragm is reduced spuious on refrigeration detector for guaranteeing the cold stop efficiency of the imaging optical system
Radiation.
By taking medium-wave infrared as an example, the reflective REAL TIME INFRARED THERMAL IMAGE specifically designed as described above polarizes double separate imaging optics
System, as shown in Figure 3；
With the optical path that object scene radiation energy starts, light is compressed by Cassegrain's reflection subassembly first, with directional light
It is incident on Wollaston Wollaston prism, so that Wollaston Wollaston prism two beams of generation are inclined what is be spatially separating
The mutually orthogonal polarised light of polarization state is referred to as polarised light 1 and polarised light 2, and two beam polarised lights are using imaging infrared lens group
Light convergence is carried out, is finally imaged onto two width polarization images on detector assembly simultaneously.Wherein:
1. Cassegrain's reflection subassembly parameter are as follows:
Service band: 4.2 μm of medium-wave infrared；
System composition: two panels reflecting mirror, primary mirror are quadratic surface, secondary mirror be it is aspherical, as shown in Figure 4；
Effective aperture: 120mm；
Focal length: f=480mm；
F number: F/#=4；
2. Wollaston Wollaston prism parameters are as follows:
Wollaston prism side length: 20mm；
Wollaston prism material: magnesium fluoride；
3. image-forming assembly parameter are as follows:
Service band: 4.2 μm of medium-wave infrared；
System composition: two panels lens, material be germanium and zinc selenide, as shown in Figure 5；
Effective aperture: 60mm；
Focal length: f=80mm；
F number: F/#=4；
Cold stop efficiency: 100%；
4. detector assembly parameter are as follows:
Type photodetector: medium wave refrigeration mode detector；
Pixel dimension: 15 μm；
Final reflective REAL TIME INFRARED THERMAL IMAGE polarizes the modulation transfer function of two width polarization images of double separate imaging optical systems
MTF figure is as shown in Figure 7, Figure 8.
The reflective REAL TIME INFRARED THERMAL IMAGE provided in the utility model embodiment polarizes double separate imaging optical systems using monochromatic light
Road polarization imaging mode solves conventional polarization imaging system point amplitude mode and is easy to introduce error due to environmental factor；Divide hole
To noise-sensitive, detectivity is weaker for diameter mode complexity height, system；Polarize that focal plane imaging mode is expensive and optical path
It is easy crosstalk and the big problem of heavy caliber infrared transmission material difficulty of processing.The utility model reflects knot using Cassegrain
Structure, monochromatic light road polarization imaging mode, front end carry out ray-collecting using Cassegrain reflective system, can obtain more infrared
Energy；Polarization spectro is carried out to the light that Cassegrain system is emitted using Wollaston prism later, can be obtained in real time same
Two width polarization images of scene carry out Image Information Processing using two width polarization images of Same Scene, target spy can be improved
Survey efficiency；Technical foundation is established for the development of REAL TIME INFRARED THERMAL IMAGE polarization imaging and detection, and ensure that cold stop efficiency, to reduce
Into the stray radiation on refrigeration detector；Using reflective optical system, it is saturating to improve system for available scenery more energy
Rate is crossed, system color difference is reduced, improves system effectiveness.
Obviously, those skilled in the art should be understood that each module of above-mentioned the utility model or each step can be used
General computing device realizes that they can be concentrated on a single computing device, or be distributed in multiple computing device institutes
On the network of composition, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by them
Storage is performed by computing device in the storage device, and in some cases, can be to be different from sequence execution herein
Shown or described step, perhaps they are fabricated to each integrated circuit modules or by multiple moulds in them
Block or step are fabricated to single integrated circuit module to realize.In this way, the utility model be not limited to any specific hardware and
Software combines.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (6)
1. a kind of reflective REAL TIME INFRARED THERMAL IMAGE polarizes double separate imaging optical systems characterized by comprising Cassegrain's reflection group
Part, Wollaston Wollaston prism, imaging infrared lens group and detector assembly；
Cassegrain's reflection subassembly, for it will be compressed from the directional light that its big incident bore receives after, Cong Qi little
Bore exports directional light, and is incident on the Wollaston Wollaston prism；
The Wollaston Wollaston prism, for by the directional light resolve into be spatially separating and polarization state mutually just
The two beam polarised lights handed over；
The imaging infrared lens group, for will two beams polarised light convergence simultaneously separate imaging to detector assembly；
The detector assembly, including detector image planes and the cold screen of detector, the detector image planes are inclined for detecting two beams
The two width polarization images that the light that shakes is formed, the cold screen of detector are used to reduce the stray radiation entered on detector assembly.
2. reflective REAL TIME INFRARED THERMAL IMAGE as described in claim 1 polarizes double separate imaging optical systems, which is characterized in that the card
Plug Green's reflection subassembly specifically includes: the primary mirror and secondary mirror for being coaxially disposed and being arranged successively；
Wherein the primary mirror is quadratic surface, and the secondary mirror is aspherical.
3. reflective REAL TIME INFRARED THERMAL IMAGE as described in claim 1 polarizes double separate imaging optical systems, which is characterized in that described fertile
Lars Wollaston prism is formed by the mutually orthogonal isosceles right angle trigonometry prism crystal optical cement of two blocks of optical axises.
4. reflective REAL TIME INFRARED THERMAL IMAGE as described in claim 1 polarizes double separate imaging optical systems, which is characterized in that the spy
The cold screen of device is surveyed to specifically include:
Diaphragm reduces the stray radiation entered on refrigeration detector for guaranteeing the cold stop efficiency of the imaging optical system.
5. reflective REAL TIME INFRARED THERMAL IMAGE as described in claim 1 polarizes double separate imaging optical systems, which is characterized in that described fertile
Lars Wollaston prism material uses magnesium fluoride or other infra-red materials with crystalline nature.
6. reflective REAL TIME INFRARED THERMAL IMAGE as described in claim 1 polarizes double separate imaging optical systems, which is characterized in that described
Wollaston prism is specifically used for:
It is different by the direction of optic axis of two triangular prism grain boundary two sides, realize incident ray by seeking when by cemented surface
Ordinary light makes the light of different direction of vibration that different foldings occur to the variation of abnormal light or by the variation of abnormal light to ordinary light
It penetrates, is formed in and is spatially separating and two beam polarised lights that polarization state is mutually orthogonal, the two beams polarised light angle β size are 2 (no-
ne), wherein noAnd neFor ordinary refraction index in crystal and abnormal optical index.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798980A (en) * | 2019-01-02 | 2019-05-24 | 中国电子科技集团公司第十一研究所 | REAL TIME INFRARED THERMAL IMAGE based on Wollaston prism polarizes double separate imaging optical systems |
| CN109884803A (en) * | 2019-02-21 | 2019-06-14 | 中国电子科技集团公司第十一研究所 | Reflective REAL TIME INFRARED THERMAL IMAGE polarizes double separate imaging optical systems |
| CN110907360A (en) * | 2019-12-19 | 2020-03-24 | 中国科学院长春光学精密机械与物理研究所 | Polarization detection system based on wolflaston prism |
| CN112684609A (en) * | 2021-03-19 | 2021-04-20 | 中国科学院西安光学精密机械研究所 | Aperture-division compact type wide-band polarization simultaneous imaging device and system |
-
2019
- 2019-02-21 CN CN201920220116.4U patent/CN209674115U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798980A (en) * | 2019-01-02 | 2019-05-24 | 中国电子科技集团公司第十一研究所 | REAL TIME INFRARED THERMAL IMAGE based on Wollaston prism polarizes double separate imaging optical systems |
| CN109884803A (en) * | 2019-02-21 | 2019-06-14 | 中国电子科技集团公司第十一研究所 | Reflective REAL TIME INFRARED THERMAL IMAGE polarizes double separate imaging optical systems |
| CN110907360A (en) * | 2019-12-19 | 2020-03-24 | 中国科学院长春光学精密机械与物理研究所 | Polarization detection system based on wolflaston prism |
| CN112684609A (en) * | 2021-03-19 | 2021-04-20 | 中国科学院西安光学精密机械研究所 | Aperture-division compact type wide-band polarization simultaneous imaging device and system |
| CN112684609B (en) * | 2021-03-19 | 2021-06-22 | 中国科学院西安光学精密机械研究所 | Aperture-division compact type wide-band polarization simultaneous imaging device and system |
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