CN104459670A - Multispectral sensing wavelength conversion system based on optical fiber array - Google Patents
Multispectral sensing wavelength conversion system based on optical fiber array Download PDFInfo
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- CN104459670A CN104459670A CN201410730423.9A CN201410730423A CN104459670A CN 104459670 A CN104459670 A CN 104459670A CN 201410730423 A CN201410730423 A CN 201410730423A CN 104459670 A CN104459670 A CN 104459670A
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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
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
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Abstract
The invention relates to a wavelength conversion system used for streak tube laser radar 3D multispectral sensing, in particular to a multispectral sensing wavelength conversion system based on an optical fiber array and belongs to the field of photo-electronic imaging. The multispectral sensing wavelength conversion system based on the optical fiber array comprises a receiving optical system, a spectro-grating, a spatial light modulator, the optical fiber array, a micro-lens array, a APD array, a transimpedance amplifier array, a differential receiving amplifier array, a vertical cavity surface laser array and a computer. The problem of manufacturing of a large-array detector is solved by introducing the spatial light modulator and the optical fiber array, and the crosstalk influence generated when all channels of a photo-electronic detector receive echo pulses is reduced. According to the multispectral sensing wavelength conversion system, the echo signals of different wavelengths are converted into peak-wavelength signals which a streak tube positive electrode material can respond to, multi-wavelength conversion for streak tube laser radar multispectral sensing is achieved, and the multispectral sensing wavelength conversion system can be widely applied to the multispectral 3D sensing imaging technology.
Description
Technical field
The present invention relates to a kind of Wavelength conversion system for stripe pipe laser infrared radar 3D multispectral sensing, particularly relate to a kind of Wavelength conversion system of the multispectral sensing based on fiber array, belong to photoelectronic imaging field.
Background technology
Based on the active multi-optical spectrum imaging system of streak tube, by three-dimensional imaging and multispectral combination, utilize the three-dimensional information of target and multispectral information to detect simultaneously, the accuracy of target detection can be improved further.Because the photocathode of streak tube can only respond the optical wavelength of some scopes, when carrying out active multispectral sensing, need design wavelength conversion equipment.At present, wavelength conversion technology can be divided into two large class, All Optical Wavelength Conversion (AOWC) and photoelectricity light type (O/E/O) wavelength convert.All Optical Wavelength Conversion, without photoelectric processing, utilizes the nonlinear optical effect of some medium, is directly transformed on new wavelength by the light signal of a certain wavelength of input in area of light.But nonlinear optical effect technology needs complicated optical devices, and conversion efficiency depends on the light intensity of incident light, is not suitable for laser radar receiving end.Photoelectricity light type wavelength convert does not change the physical property of wavelength, directly can realize wavelength convert by photoelectric effect, and have that conversion efficiency is high, fast response time, frequency inverted scope are large, be convenient to the advantages such as integrated, have good application prospect.
The photodetector array of high pixel number is as the core devices of photoelectricity light type Wavelength conversion system, but the APD detector array generally used at present is difficult to ensure larger pixel number.Utilize the pliability of optical fiber, by connecting the fiber array that discrete single-point photodetector makes high pixel count at array tail optical fiber, such design both ensure that larger pixel number, solved again the difficult problem making large photoelectric detector array.
Summary of the invention
The object of the invention is, in order to solve multispectral sensing medium wavelength transfer problem and make the problem of large planar array detector, to propose a kind of multispectral sensing Wavelength conversion system based on fiber array.
The object of the invention is to be achieved through the following technical solutions.
Based on a multispectral sensing Wavelength conversion system for fiber array, it comprises receiving optics, spectro-grating, spatial light modulator, fiber array, microlens array, photodiode APD array, transimpedance amplifier array, differential receive amplifier array, planar laser with vertical cavity array, computing machine formation.
Described spatial light modulator is positioned over described fiber array front end, for controlling the light area of fiber array, without cross talk effects when guaranteeing photoelectric detector echo-pulse laser beam.
Described computing machine realizes Automated condtrol by programming to spatial light modulator.
Described fiber array is 16*16 array, is made up of 256 root multimode fibers.Fiber array front end is square formation array, and rear end 16 is restrainted fibre bundle and connected discrete photodiode APD respectively.
The wavelength response peak of described photodiode APD array is respectively λ
1=1064nm, λ
2=532nm, λ
3=355nm.
The output current of photodiode APD is converted to differential output voltage by described transreactance amplifier array, carries out one-level amplification to signal, and enlargement factor is 90 times.
One-level differential output voltage is carried out secondary amplification by described differential receive amplifier array, and enlargement factor is 5 times.
The described planar laser with vertical cavity laser instrument that to be a kind of outgoing beam direction vertical with semiconductor epitaxial surface, the optical maser wavelength of this transmitting is consistent with the peak wavelength of streak tube photocathode resp.
The peak wavelength of described streak tube photocathode resp is 650nm.
The course of work is: the echoed signal mixing multiwavelength laser bundle after target reflection receives through receiving optics and assembles to spectro-grating, and spectro-grating will form the echo laser beam of different wave length after the mixing multi-wavelength light beam light splitting received.The echo laser beam of different wave length is assembled respectively to 16*16 fiber array front end face.The spatial light modulator being placed on fiber array front end is controlled by computing machine, to realize the Region control to fiber array 4*4.Such guarantee only has a region to have light signal to input at every turn, only has an optical fiber to have light, thus receive only the signal in a region in the optical fiber of 16 photodiode APD connections of rear end.The light pulse signal that 16 bundle fibre bundles export is received by microlens array respectively and focuses to photodiode APD, and the light pulse signal received, by opto-electronic conversion, is enlarged into the current signal corresponding with incident intensity by photodiode APD.Transimpedance amplifier realizes current-voltage conversion, exports certain amplitude voltage, and transimpedance pattern can effective step-down amplifier noise, raising dynamic range.The output signal of transimpedance amplifier is amplified by differential receive amplifier further, to reach the condition meeting and drive planar laser with vertical cavity, finally realizes wavelength convert.
Compared with prior art, beneficial effect of the present invention
Adopt the Wavelength conversion system of the multispectral sensing based on fiber array of the present invention, on the one hand, by simple light-to-current inversion mode, the multiwavelength laser containing target information is converted to the peak wavelength laser of streak tube photocathode resp; On the other hand, by introducing the use of spatial modulator and fiber array, while achieving imaging detection, solving the difficult problem making large planar array detector array, also reducing the quantity of photodetector.The present invention can be widely used in multispectral sensing imaging technique.
Accompanying drawing explanation
Fig. 1 is 16*16 fiber array structure figure in embodiment;
Fig. 2 is the multispectral sensing Wavelength conversion system schematic diagram based on fiber array in embodiment;
Wherein, 1-receiving optics, 2-spectro-grating, 3-spatial light modulator, 4-fiber array, 5-microlens array, 6-photodiode APD array, 7-transimpedance amplifier array, 8-differential receive amplifier array, 9-planar laser with vertical cavity array, 10-computing machine.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described
Embodiment
A kind of multispectral sensing Wavelength conversion system based on fiber array, as shown in Figure 2, comprise receiving optics 1, spectro-grating 2, spatial light modulator 3, fiber array 4, microlens array 5, photodiode APD array 6, transreactance amplifier array 7, differential receive amplifier array 8, planar laser with vertical cavity array 9, computing machine 10 is formed.
Described computing machine, by programming, changes gray level image to control amplitude corresponding to spatial light modulator planar plate pixel cell.Described spatial light modulator is nematic liquid crystal amplitude spatial light modulator, realizes 4*4 Region control to fiber array.First be region (I, I) have light signal through, other regions are light tight; Next be region (I, II) have light signal through, other regions are light tight ... in like manner, until region (IV, IV).
Described fiber array is 16*16 square formation array, and square formation array is easier to determine fiber position.Be divided into into 16 regions, first optical fiber in each region is bundled into a branch of in rear end, as the first bundle optical fiber; Second, each region optical fiber is bundled into a branch of in rear end, as the second bundle optical fiber ... in like manner, until the 16th bundle optical fiber.Often restraint fibre bundle to be made up of 16 root multimode fibers, multimode optical fiber has larger numerical aperture compared with single-mode fiber, can improve received optical power.Wherein, the core diameters of simple optical fiber is 50um, and cladding diameter is 125um, and the optical fiber of fiber array is spaced apart 127um or 250um.
Described photodiode APD array is made up of 16 APD altogether, respectively fiber array rear end 16 is restrainted fibre bundle emergent light signal focus to photodiode APD array by microlens array, light signal is converted to the current signal corresponding with output light intensity by photodiode APD array.
The emission wavelength of described planar laser with vertical cavity array is 650nm, consistent with the peak wavelength of streak tube photocathode resp.
The course of work
Receiving optics 1 is by the mixing multi-wavelength λ with target information
1, λ
2, λ
3light beam is assembled to spectro-grating 2; Mixing multiwave length spectro is become λ by spectro-grating 2
1, λ
2, λ
3laser beam; Wavelength is λ
1, λ
2, λ
3laser beam assemble respectively to 16*16 fiber array 4 front end face.The spatial light modulator 3 being placed on fiber array 4 front end is controlled by computing machine, to realize the Region control of the 4*4 to fiber array 4.The spatial light modulator controlled by computing machine 10 3 pairs of fiber arrays 4 carry out Region control, and Single wavelength laser beam signal is passed through successively by region, ensure that fibre bundle is restrainted in fiber array rear end 16, often restraint fibre bundle and only have an optical fiber to have light at every turn.The light signal that 16 bundle fibre bundles export is received by microlens array 5 respectively, and light signal is converted to the current signal corresponding with light intensity by convergence to photodiode APD array 6, photodiode APD array 6.Current signal is converted to the differential voltage signal of amplification by transimpedance amplifier array 7, realizes one-level amplify signal; The differential voltage signal that differential receive amplifier array 8 pairs of one-levels are amplified carries out secondary amplification, to reach the condition driving planar laser with vertical cavity array 9; Planar laser with vertical cavity array 9 outgoing wavelength is 650nm light signal, realizes wavelength convert.
Principle of work
4*4 Region control is realized by spatial light modulator 3 pairs of fiber arrays 4, ensure to only have a region to have light signal to input in 16 regions of fiber array at every turn, so just can make 16 bundle fibre bundles of fiber array rear end, often restraint fibre bundle only has an optical fiber to have light at every turn, 16 APD receive the light signal in a region at every turn, decrease the crosstalk between detector.
Spatial light modulator, mainly based on the micro-display technique of liquid crystal of transmission or reflection type, realizes the corrugated amplitude of incident beam and the modulation of phase place by the rotatory polarization of liquid crystal molecule and birefringence.Computing machine controls amplitude corresponding to spatial light modulator planar plate pixel cell, to reach the control to fiber array region by gray level image.
The transition form of transimpedance amplifier array 7 is transimpedance pattern, can effectively reduce amplifier noise, improves common-mode rejection ratio.
Wavelength is respectively λ
1, λ
2, λ
3echoed signal after photodiode APD array 6 opto-electronic conversion, export as the current signal i proportional with incident intensity
1, i
2, i
3.Transimpedance amplifier array 7 is by current signal i
1, i
2, i
3be converted to differential voltage signal ± U
1, ± U
2, ± U
3.The differential receive amplifier array 8 of high bandwidth by Differential Input ± U
1, ± U
2, ± U
3carry out secondary amplification, and be converted to Single-end output U
a, U
b, U
c.Single-end output signal U
a, U
b, U
cdrive planar laser with vertical cavity array 9 respectively, make it the laser that emission wavelength is 650nm.
Claims (1)
1. the multispectral sensing Wavelength conversion system based on fiber array, comprise receiving optics (1), spectro-grating (2), spatial light modulator (3), fiber array (4), microlens array (5), photodiode APD array (6), transimpedance amplifier array (7), differential receive amplifier array (8), planar laser with vertical cavity array (9), computing machine (10), it is characterized in that:
Described spectro-grating (2) adopts diffraction grating, mixing multiwavelength laser bundle is divided into three kinds of wavelength lasers: be respectively 1064nm, 532nm, 355nm;
Described spatial light modulator (3) is positioned over described fiber array (4) front end, for controlling the light area of fiber array (4), without cross talk effects when guaranteeing photoelectric detector echo-pulse laser beam;
Described fiber array (4) is 16*16 array, is made up of 256 root multimode fibers;
Described photodiode APD array (6), wavelength response peak be respectively λ
1=1064nm, λ
2=532nm, λ
3=355nm;
The output current of photodiode APD array (6) is converted to differential output voltage by described transreactance amplifier array (7), carries out one-level amplification to signal, and enlargement factor is 90 times;
One-level differential output voltage is carried out secondary amplification by described differential receive amplifier array (8), and enlargement factor is 5 times;
The outgoing beam direction of described planar laser with vertical cavity (9) is vertical with semiconductor epitaxial surface, and the optical maser wavelength that this laser instrument is launched is consistent with the peak wavelength of streak tube photocathode resp.
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| CN106526570A (en) * | 2016-10-19 | 2017-03-22 | 北京空间机电研究所 | Satellite-borne laser range finder echo detection circuit |
| CN106989817A (en) * | 2017-05-15 | 2017-07-28 | 华北电力大学 | A kind of light-gathering heat collection pipe scanning means based on fiber array |
| CN107272177A (en) * | 2017-07-04 | 2017-10-20 | 清华大学 | Micro imaging system |
| CN106154286B (en) * | 2016-07-27 | 2018-06-08 | 北京理工大学 | A kind of multispectral streak tube laser imaging system of novel Non-scanning mode |
| CN108344507A (en) * | 2017-12-26 | 2018-07-31 | 湖北航天技术研究院总体设计所 | A kind of performance testing device and method of Spectral beam combining system |
| CN109343024A (en) * | 2018-12-19 | 2019-02-15 | 中国科学院合肥物质科学研究院 | EO-1 hyperion laser radar echo signal beam-splitting optical system and its processing method |
| CN110703394A (en) * | 2018-07-09 | 2020-01-17 | 余姚舜宇智能光学技术有限公司 | Large-area signal light energy acquisition system and method |
| WO2020036621A1 (en) * | 2018-08-14 | 2020-02-20 | Didi Research America, Llc | Light detection and ranging (lidar) system using a wavelength converter |
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| CN113544928A (en) * | 2019-06-06 | 2021-10-22 | 京瓷株式会社 | Optical connector of optical fiber power supply system, power supply device and optical fiber power supply system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154286B (en) * | 2016-07-27 | 2018-06-08 | 北京理工大学 | A kind of multispectral streak tube laser imaging system of novel Non-scanning mode |
| CN106526570B (en) * | 2016-10-19 | 2019-04-30 | 北京空间机电研究所 | Spaceborne laser range finder sounding circuit |
| CN106526570A (en) * | 2016-10-19 | 2017-03-22 | 北京空间机电研究所 | Satellite-borne laser range finder echo detection circuit |
| CN106989817A (en) * | 2017-05-15 | 2017-07-28 | 华北电力大学 | A kind of light-gathering heat collection pipe scanning means based on fiber array |
| CN106989817B (en) * | 2017-05-15 | 2018-11-06 | 华北电力大学 | A kind of light-gathering heat collection pipe scanning means based on fiber array |
| CN107272177A (en) * | 2017-07-04 | 2017-10-20 | 清华大学 | Micro imaging system |
| CN111480094A (en) * | 2017-12-13 | 2020-07-31 | 天空激光二极管有限公司 | L IDAR system including gallium and nitrogen containing laser light source |
| US11867813B2 (en) | 2017-12-13 | 2024-01-09 | Kyocera Sld Laser, Inc. | Distance detecting systems for use in mobile machines including gallium and nitrogen containing laser diodes |
| US11841429B2 (en) | 2017-12-13 | 2023-12-12 | Kyocera Sld Laser, Inc. | Distance detecting systems for use in mobile machine applications |
| CN108344507A (en) * | 2017-12-26 | 2018-07-31 | 湖北航天技术研究院总体设计所 | A kind of performance testing device and method of Spectral beam combining system |
| CN110703394A (en) * | 2018-07-09 | 2020-01-17 | 余姚舜宇智能光学技术有限公司 | Large-area signal light energy acquisition system and method |
| US11175385B2 (en) | 2018-08-14 | 2021-11-16 | Beijing Voyager Technology Co., Ltd. | Light detection and ranging (LiDAR) system using a wavelength converter |
| WO2020036621A1 (en) * | 2018-08-14 | 2020-02-20 | Didi Research America, Llc | Light detection and ranging (lidar) system using a wavelength converter |
| US11906668B2 (en) | 2018-08-14 | 2024-02-20 | Beijing Voyager Technology Co., Ltd. | Light detection and ranging (LiDAR) system using a wavelength converter |
| CN109343024A (en) * | 2018-12-19 | 2019-02-15 | 中国科学院合肥物质科学研究院 | EO-1 hyperion laser radar echo signal beam-splitting optical system and its processing method |
| CN113544928A (en) * | 2019-06-06 | 2021-10-22 | 京瓷株式会社 | Optical connector of optical fiber power supply system, power supply device and optical fiber power supply system |
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