CN104166143A - Photorefractive holographic astigmation Fourier-transform imaging processor - Google Patents
Photorefractive holographic astigmation Fourier-transform imaging processor Download PDFInfo
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- CN104166143A CN104166143A CN201410351176.1A CN201410351176A CN104166143A CN 104166143 A CN104166143 A CN 104166143A CN 201410351176 A CN201410351176 A CN 201410351176A CN 104166143 A CN104166143 A CN 104166143A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
- G01S17/90—Lidar systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
Abstract
Disclosed is a photorefractive holographic astigmation Fourier-transform imaging processor which includes an illuminating laser beam, and a data receiving system, a reflective phase space light modulator, a photorefractive-body holographic device and a CCD camera, which are coaxial sequentially. An output end of the data receiving system is connected with an input end of the reflective space light modulator through a data line. An output end of the CCD camera is connected with an input end of a computer through a data line. The reflective space light modulator and the photorefractive-body holographic device are arranged in an abutting manner sequentially. A receiving face of the CCD camera coincides with a focal plane of the photorefractive-body holographic device. The photorefractive holographic astigmation Fourier-transform imaging processor adopts lithium niobate non-volatilisation photorefractive holography to realize a multi-property-integrating astigmation Fourier-transform lens so that light-speed parallel real-time imaging can be realized; and the processor has the advantages of being light in weight, low in power consumption and small in volume and is comparatively suitable for on-satellite constraint conditions of volume, weight and power consumption and the like.
Description
Technical field
The present invention relates to optical imagery processor, particularly a kind of photorefractive hologram astigmatism Fourier transform imaging processor for optical synthesis aperture laser imaging radar.
Background technology
Synthetic aperture laser imaging radar (being called for short SAIL) is can be at the remote unique optical imagery Observations Means that obtains centimetre magnitude resolution.In the face of the complicated space environment at satellite place, adopt specialized microwave synthetic-aperture radar (the being called for short SAR) imaging processing system based on optics can effectively avoid the impact from aspects such as temperature variation, cosmic rays and particle upsets, reduce the restriction that comes from the aspect such as power consumption and volume.Imaging processing system based on optics is by with simple in structure, stability and the competent satellite-borne SAR of the advantage application scenario of real time imagery in-orbit such as robust type is strong, Radiation hardness strong, low-power consumption, processing speed are fast.The research of synthetic aperture laser imaging radar at present has developed the new architecture that fully demonstrates optical characteristics, it no longer can realize with microwave [document 1 L.Liu based on optical wave-front shift theory, Coherent and incoherent synthetic aperture imaging ladars and laboratory-space experimental demonstrations[Invited], Applied Optics, 52 (4), 579-599, (2013)].Therefore, optics SAIL imaging system can realize light velocity parallel real-time imaging, and has lightweight, low-power consumption, advantage that volume is little, is applicable on star constraint conditions such as volume, weight, power consumptions.
Sell off for light both at home and abroad that lithium columbate crystal is holographic and application has extensive research, light to sell off mechanism and material system develops into codope from single doping, main application direction is that optical storage and light display are shown.But light is sold off lithium niobate phase place body, holography also has significant application value as optical device, its research [document 2 M.Bazzan that always continue into the present, M.V.Ciampolillo, A.Zaltron, N.Argiolas, C.Sada, N.Kokanian and M.D.Fontana, Fabrication and characterization of photorefractive platforms in lithium niobate for recording of integrated holographic devices, IEEE conference publications, 1-4, (2012). document 3 J.R.Park, J.Sierchio, M.Zaverton, Y.Kim, T.D.Milster, Characterization of photoresist and simulation of a developed resist profile for the fabrication of gray-scale diffractive optic elements, Optical Engineering, 51 (2), 023401, (2012) .].The research that domestic light is sold off lithium niobate holography mainly concentrates on optical storage field.The present invention concentrates on local photorefractive hologram element and integrated.
From domestic and international overall condition, the optical imagery processing of synthetic aperture laser imaging radar (SAIL), particularly adopts integrated Anaclasis variant holographic optical device to form optical imagery and processes the report that still there is no this respect work.
Summary of the invention
The object of the present invention is to provide a kind of photorefractive hologram astigmatism Fourier transform imaging processor for optical synthesis aperture laser imaging radar, this device adopts the non-volatile photorefractive hologram of lithium niobate to realize the integrated astigmatism fourier transform lens of many performances, can realize light velocity parallel real-time imaging, and there is lightweight, low-power consumption, advantage that volume is little, be applicable on star constraint conditions such as volume, weight, power consumptions.
Technical solution of the present invention is as follows:
A kind of photorefractive hologram astigmatism Fourier transform imaging processor, feature is that its formation comprises laser illuminator light beam, with optical axis data receiving system successively, reflective phase type spatial light modulator, Anaclasis variant holographic device and ccd video camera, the output terminal of described data receiving system is connected with the input end of described reflective spatial light modulator by data line, the output terminal of described ccd video camera is connected with the input end of computing machine by data line, described reflective spatial light modulator and Anaclasis variant holographic device are successively near setting, the receiving plane of described ccd video camera overlaps with the focal plane of described Anaclasis variant holographic device.
Described Anaclasis variant holographic device comprises laser instrument, polarization beam apparatus, 1/2nd wave plates, two total reflective mirrors, wavefront transform optical system, sensitization light, convex lens, wave filter and LiNbO
3: Ce:Cu crystal, the light beam of described laser instrument is divided into light intensity through polarization beam apparatus and is close to equal two-beam: a branch of conduct is incided LiNbO with reference to light after 1/2nd wave plates, total reflective mirror
3: Ce:Cu plane of crystal, another Shu Zuowei flashlight incides LiNbO after total reflective mirror, wavefront transform optical system
3: Ce:Cu plane of crystal, described signal beams and reference beam are at LiNbO
3: Ce:Cu plane of crystal meets Bragg diffraction condition, after described sensitization light planoconvex lens, wave filter, is irradiated to LiNbO
3: Ce:Cu plane of crystal, described wavefront transform optical system is the astigmatism Fourier transform lens group of convex lens and concavees lens composition.
Described reference light is identical with signal light wavelength, and described sensitization light wavelength is shorter than described signal light wavelength.
Described laser illuminator light beam is identical with reference beam wavelength with the preparation of photorefractive hologram device.
In light-struck while of sensitization, reference light and flashlight incide LiNbO with Bragg angle
3: Ce:Cu plane of crystal, is recorded to LiNbO by the corrugated of the wavefront transform optical system being made up of convex lens and concavees lens
3: in Ce:Cu crystal, the multiple optical element of wavefront transform optical system is integrated into a LiNbO
3: in Ce:Cu crystal, form photorefractive hologram device, reduced the volume of system, reduced the weight of system.
Data receiving system is by the described spatial light modulator of 2-D data input of the optical synthesis aperture laser imaging radar receiving, time domain 2D signal is transformed to spatial domain by this spatial light modulator, through photorefractive hologram device, by illumination beam, at CCD surface focal imaging.
Technique effect of the present invention:
The present invention adopts non-volatile light to sell off lithium niobate holographic element can integrated multiple optical element, length simultaneously that can greatly dwindle processor due to the unchanged straight-through space-variant transport property of light beam of its non-Bragg angle, can realize light velocity parallel real-time imaging, there is lightweight, low-power consumption, advantage that volume is little, be applicable on star constraint conditions such as volume, weight, power consumptions.On optical synthesis aperture laser imaging radar target echo data focal imaging is processed, tool has great advantage, and also obtains with the full light compositing aperture laser imaging radar of imaging processing and lays the foundation for the full Optical Implementation target information of exploration simultaneously.
Brief description of the drawings
Fig. 1 is the structural representation of photorefractive hologram astigmatism Fourier transform imaging processor of the present invention.
Fig. 2 is the structural drawing of Anaclasis variant holographic device in the present invention.
Embodiment
Below in conjunction with accompanying drawing, photorefractive hologram astigmatism optical Fourier transform imaging processor of the present invention is described further, but should limit the scope of the invention with this.
Refer to Fig. 1, Fig. 1 is the structural representation of the embodiment of the present invention, as seen from the figure, the formation of photorefractive hologram astigmatism optical Fourier transform imaging processor of the present invention comprises that laser illuminator light beam 1 and the device with optical axis are followed successively by data receiving system 2, reflective spatial light modulator 3, Anaclasis variant holographic device 4 and ccd video camera 5, the output terminal of described data receiving system 2 is connected with the input end of described reflective spatial light modulator 3 by data line, the output terminal of described ccd video camera 5 is connected with the input end of computing machine 6 by data line, described reflective spatial light modulator 3 and Anaclasis variant holographic device 4 are successively near setting, the receiving plane of described ccd video camera 5 overlaps with the focal plane of described Anaclasis variant holographic device 4.
Data receiving system 2 is by the time domain 2-D data input space photomodulator 3 receiving, time domain data transformation is arrived spatial domain by spatial light modulator 3, Data Modulation is become to light signal reflection output, the light signal of output incides the Anaclasis variant holographic device 4 that nestles up described spatial light modulator with Bragg diffraction condition, laser illuminator light beam 1 is irradiated on Anaclasis variant holographic device 4 with non-Bragg diffraction condition simultaneously, flashlight through the quadratic term phase compensation of Anaclasis variant holographic device 4 and two-dimensional fast fourier transform simultaneously in orientation to distance to focusing, the diffraction light imaging on focal plane focusing on, described ccd video camera 5 is transferred to the picture receiving on focal plane in computing machine 6, on computing machine, present the picture of target.
Refer to Fig. 2, Fig. 2 is the structural drawing of Anaclasis variant holographic device of the present invention, and as seen from the figure, the structure of Anaclasis variant holographic device 4 of the present invention comprises laser instrument 7,9, two total reflective mirrors 10 of polarization beam apparatus 1/8th, two wave plate, wavefront transform system 11, LiNbO
3: Ce:Cu crystal 12, sensitization light 13 and convex lens 14.
The light that laser instrument 7 sends is divided into through polarization beam apparatus 8 two-beam that light intensity is equal, and a branch of conduct is incided LiNbO with reference to light beam through 1/2nd wave plates 9, total reflective mirror 10
3: Ce:Cu crystal 12 surfaces, another Shu Zuowei signal beams incides LiNbO through total reflective mirror 10, wavefront transform system 11
3: Ce:Cu crystal 12 surfaces.Reference beam and signal beams are at LiNbO
3: Ce:Cu crystal 12 surfaces meet Bragg diffraction condition.The light planoconvex lens 14 that sensitization light 13 sends forms directional light and is irradiated to LiNbO
3: Ce:Cu crystal 12 surfaces.When sensitization light 13 irradiates, flashlight and reference light incide LiNbO with Bragg angle
3: Ce:Cu crystal 12 surfaces, form interference fringe and record adult holography.The wavefront transform system 11 being made up of convex lens and concavees lens is integrated into LiNbO
3: in Ce:Cu crystal 12, form Anaclasis variant holographic device 4.
The data that the present invention intends the reflective phase type spatial light modulator 3 adopting are: logical light size 15.36 × 8.64mm, pixel count 1920 × 1080, pixel dimension 8 μ m.Therefore the optical channel aperture of processor is approximately 16 × 16mm.The size of lithium niobate Anaclasis variant holographic device should be greater than 16 × 16mm, and therefore the diameter of required crystal bar should be 30mm left and right.The present invention utilizes the feature of the reflective loading of spatial light modulator 3, laser illuminator light beam 1 is passed through to Anaclasis variant holographic device 4 with non-Bragg diffraction condition, and the data of spatial light modulator 3 load folded light beam with Bragg diffraction condition incident Anaclasis variant holographic element 4, therefore can effectively dwindle processor yardstick, implementation structure densification.
Claims (4)
1. a photorefractive hologram astigmatism Fourier transform imaging processor, be characterised in that its formation comprises laser illuminator light beam, with optical axis data receiving system successively, reflective phase type spatial light modulator, Anaclasis variant holographic device and ccd video camera, the output terminal of described data receiving system is connected with the input end of described reflective spatial light modulator by data line, the output terminal of described ccd video camera is connected with the input end of computing machine by data line, described reflective spatial light modulator and Anaclasis variant holographic device are successively near setting, the receiving plane of described ccd video camera overlaps with the focal plane of described Anaclasis variant holographic device.
2. photorefractive hologram astigmatism Fourier transform imaging processor according to claim 1, is characterised in that described Anaclasis variant holographic device comprises laser instrument, polarization beam apparatus, 1/2nd wave plates, two total reflective mirrors, wavefront transform optical system, sensitization light, convex lens, wave filter and LiNbO
3: Ce:Cu crystal, the light beam of described laser instrument is divided into light intensity through polarization beam apparatus and is close to equal two-beam: a branch of conduct is incided LiNbO with reference to light after 1/2nd wave plates, total reflective mirror
3: Ce:Cu plane of crystal, another Shu Zuowei flashlight incides LiNbO after total reflective mirror, wavefront transform optical system
3: Ce:Cu plane of crystal, described signal beams and reference beam are at LiNbO
3: Ce:Cu plane of crystal meets Bragg diffraction condition, after described sensitization light planoconvex lens, wave filter, is irradiated to LiNbO
3: Ce:Cu plane of crystal, described wavefront transform optical system is the astigmatism Fourier transform lens group of convex lens and concavees lens composition.
3. photorefractive hologram astigmatism Fourier transform imaging processor according to claim 2, is characterised in that described reference light is identical with signal light wavelength, and described sensitization light wavelength is shorter than described signal light wavelength.
4. photorefractive hologram astigmatism Fourier transform imaging processor according to claim 1, is characterised in that described laser illuminator light beam is identical with photorefractive hologram device preparation reference beam wavelength.
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Citations (5)
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|---|---|---|---|---|
| US5276636A (en) * | 1992-09-14 | 1994-01-04 | Cohn Robert W | Method and apparatus for adaptive real-time optical correlation using phase-only spatial light modulators and interferometric detection |
| US5751243A (en) * | 1990-10-29 | 1998-05-12 | Essex Corporation | Image synthesis using time sequential holography |
| EP1099959A2 (en) * | 1991-12-20 | 2001-05-16 | Essex Corporation | Image synthesis using time sequential holography |
| WO2009111609A2 (en) * | 2008-03-05 | 2009-09-11 | Purdue Research Foundation | Method and apparatus for motility contrast imaging |
| CN103425035A (en) * | 2013-07-10 | 2013-12-04 | 中国人民解放军装甲兵工程学院 | Printing system of holographic stereogram and with abnormal-shaped mask plate |
-
2014
- 2014-07-23 CN CN201410351176.1A patent/CN104166143A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751243A (en) * | 1990-10-29 | 1998-05-12 | Essex Corporation | Image synthesis using time sequential holography |
| EP1099959A2 (en) * | 1991-12-20 | 2001-05-16 | Essex Corporation | Image synthesis using time sequential holography |
| US5276636A (en) * | 1992-09-14 | 1994-01-04 | Cohn Robert W | Method and apparatus for adaptive real-time optical correlation using phase-only spatial light modulators and interferometric detection |
| WO2009111609A2 (en) * | 2008-03-05 | 2009-09-11 | Purdue Research Foundation | Method and apparatus for motility contrast imaging |
| CN103425035A (en) * | 2013-07-10 | 2013-12-04 | 中国人民解放军装甲兵工程学院 | Printing system of holographic stereogram and with abnormal-shaped mask plate |
Non-Patent Citations (1)
| Title |
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| 陈宝东: "大面积光折变光子晶格的制作及其光学特性研究", 《中国优秀硕士学位论文全文数据库》 * |
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Application publication date: 20141126 |