CN104459670B - A kind of multispectral sensing Wavelength conversion system based on fiber array - Google Patents
A kind of multispectral sensing Wavelength conversion system based on fiber array Download PDFInfo
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- CN104459670B CN104459670B CN201410730423.9A CN201410730423A CN104459670B CN 104459670 B CN104459670 B CN 104459670B CN 201410730423 A CN201410730423 A CN 201410730423A CN 104459670 B CN104459670 B CN 104459670B
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- array
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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
Abstract
The present invention relates to a kind of Wavelength conversion system for stripe pipe laser infrared radar 3D multispectral sensings, more particularly to a kind of Wavelength conversion system of the multispectral sensing based on fiber array, belong to photoelectronic imaging field.Including receiving optics, spectro-grating, spatial light modulator, fiber array, microlens array, photodiode APD array, transreactance amplifier array, differential received amplifier array, planar laser with vertical cavity array, computer.Wherein, by introducing spatial light modulator and fiber array, solve to make the problem of large area array detector, reduce the cross talk effects that each passage of photodetector receives echo impulse.The echo-signal of different wave length is converted to a kind of peak wavelength signal that streak tube cathode material can be responded by the present invention, is solved the multi-wavelength transfer problem of stripe pipe laser infrared radar multispectral sensing, be can be widely applied in multispectral three-dimensional detection imaging technique.
Description
Technical field
The present invention relates to a kind of Wavelength conversion system for stripe pipe laser infrared radar 3D multispectral sensings, more particularly to one
The Wavelength conversion system of the multispectral sensing based on fiber array is planted, belongs to photoelectronic imaging field.
Background technology
Active multi-optical spectrum imaging system based on streak tube, by three-dimensional imaging and multispectral combination, utilizes the three-dimensional of target
Information and multispectral information are detected simultaneously, can further improve the accuracy of target acquisition.Due to the photoelectricity of streak tube
Negative electrode can only be responded to the optical wavelength of some scope, when carrying out active multispectral sensing, it is necessary to which design wavelength is changed
Device.At present, wavelength conversion technology can be divided into two major classes, All Optical Wavelength Conversion (AOWC) and photoelectricity light type (O/E/O) wavelength
Conversion.All Optical Wavelength Conversion, will be defeated directly in area of light using the nonlinear optical effect of some media without photoelectric processing
The optical signal of a certain wavelength entered is transformed on new wavelength.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 terminal.Photoelectricity light type wavelength convert does not change
Become the physical property of wavelength, wavelength convert can be directly realized by by photoelectric effect, and with high conversion efficiency, fast response time,
Frequency conversion scope is big, the advantages of be easy to integrated, there is preferable application prospect.
The photodetector array of high pixel number as photoelectricity light type Wavelength conversion system core devices, it is but universal at present
The APD detector arrays that use are it is difficult to ensure that larger pixel number.Using the pliability of optical fiber, by the connection point of array tail optical fiber
Vertical single-point photodetector makes the fiber array of high pixel count, and such design both ensure that larger pixel number, solves again
Determine and made the problem of large photoelectric detector array.
The content of the invention
The invention aims to solve multispectral sensing medium wavelength transfer problem and make asking for large area array detector
A kind of topic, it is proposed that multispectral sensing Wavelength conversion system based on fiber array.
The purpose of the present invention is achieved through the following technical solutions.
A kind of multispectral sensing Wavelength conversion system based on fiber array, it include receiving optics, spectro-grating,
Spatial light modulator, fiber array, microlens array, photodiode APD array, transimpedance amplifier array, differential received
Amplifier array, planar laser with vertical cavity array, computer are constituted.
Described spatial light modulator is positioned over described fiber array front end, the sensitive area for controlling fiber array
Domain, to ensure during photodetector reception echo impulse laser beam without cross talk effects.
Described computer can realize Automated condtrol by programming to spatial light modulator.
Described fiber array is 16*16 arrays, is made up of 256 root multimode fibers.Fiber array front end is square formation array,
The beam fibre bundle of rear end 16 connects discrete photodiode APD respectively.
The wavelength response peak of described photodiode APD array is respectively λ1=1064nm, λ2=532nm, λ3=
355nm。
Photodiode APD output current is converted to differential output voltage by described transreactance amplifier array, to letter
Number carry out one-level amplification, multiplication factor be 90 times.
One-level differential output voltage is carried out two grades of amplifications by described differential received amplifier array, and multiplication factor is 5 times.
Described planar laser with vertical cavity is a kind of outgoing beam direction laser vertical with semiconductor epitaxial surface, should
The optical maser wavelength of 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 received optical system of echo-signal mixing multiwavelength laser beam after being reflected through target is received simultaneously
Spectro-grating is converged to, spectro-grating will form the echo laser of different wave length after the mixing multi-wavelength beam light splitting received
Beam.The echo laser beam of different wave length converges to 16*16 fiber array front end faces respectively.It is placed on the space of fiber array front end
Optical modulator is by computer control, to realize the Region control to fiber array 4*4.So ensure that each only one of which region has
Optical signal is inputted, and an only optical fiber has light in the optical fiber of 16 photodiode APD connections of rear end, so as to receive only one
The signal in individual region.The light pulse signal of 16 beam fibre bundles output is received by microlens array and focuses to photodiode respectively
The light pulse signal received is enlarged into the electricity corresponding with incident intensity by APD, photodiode APD by opto-electronic conversion
Flow signal.Transimpedance amplifier realizes that current-voltage is changed, and exports certain amplitude voltage, and mutual impedance pattern can effectively be reduced and put
Big device noise, improves dynamic range.Differential received amplifier further amplifies the output signal of transimpedance amplifier, to reach
The condition of driving planar laser with vertical cavity is met, wavelength convert is finally realized.
Compared with prior art, beneficial effects of the present invention
Using the Wavelength conversion system of the multispectral sensing based on fiber array of the present invention, on the one hand, can be by simple
Light-to-current inversion mode the peak wavelength that the multiwavelength laser containing target information is converted to streak tube photocathode resp is swashed
Light；On the other hand, by introducing the use of spatial modulator and fiber array, while imaging detection is realized, solve
The problem of large area array detector array is made, the quantity of photodetector is also reduced.The present invention can be widely applied to light more
Compose in detection imaging technology.
Brief description of the drawings
Fig. 1 is 16*16 fiber array structure figures 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-gratings, 3- spatial light modulators, 4- fiber arrays, 5- lenticules battle array
Row, 6- photodiode APD arrays, 7- transimpedance amplifier arrays, 8- differential received amplifier arrays, 9- vertical cavity surface laser
Device array, 10- computers.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings
Embodiment
A kind of multispectral sensing Wavelength conversion system based on fiber array, as shown in Fig. 2 including receiving optics 1,
Spectro-grating 2, spatial light modulator 3, fiber array 4, microlens array 5, photodiode APD array 6, transreactance amplifier battle array
Row 7, differential received amplifier array 8, planar laser with vertical cavity array 9, computer 10 is constituted.
Described computer changes gray level image to control spatial light modulator planar plate pixel cell corresponding by programming
Amplitude.Described spatial light modulator is nematic liquid crystal amplitude spatial light modulator, and 4*4 Region controls are realized to fiber array.
It is that region (I, I) has optical signal transmission first, other regions are light tight；Next to that region (I, II) has optical signal transmission, other
Region is light tight ... similarly, until region (IV, IV).
Described fiber array is 16*16 square formation arrays, and square formation array is easier to determine fiber position.It is divided into 16 areas
Domain, first optical fiber in each region is bundled into a branch of in rear end, is used as the first beam optical fiber；Second, each region optical fiber exists
Rear end be bundled into it is a branch of, until the 16th beam optical fiber as the second beam optical fiber ... similarly.Per beam fibre bundle by 16 root multimode fibers
Composition, multimode fibre has bigger numerical aperture compared with single-mode fiber, can improve received optical power.Wherein, the core of simple optical fiber
Nuclear diameter is 50um, and cladding diameter is 125um, and the optical fiber of fiber array is at intervals of 127um or 250um.
Described photodiode APD array is made up of 16 APD altogether, by microlens array respectively by fiber array rear end
16 beam fibre bundle emergent light signal focus to photodiode APD array, photodiode APD array convert optical signals to
The corresponding current signal of output light intensity.
The launch wavelength of described planar laser with vertical cavity array is 650nm, the peak value with streak tube photocathode resp
Consistent wavelength.
The course of work
Receiving optics 1 is by the mixing multi-wavelength λ with target information1、λ2、λ3Light beam converges to spectro-grating 2；Point
Light grating 2 will mix multiwave length spectro into λ1、λ2、λ3Laser beam；Wavelength is λ1、λ2、λ3Laser beam converge to 16*16 respectively
The front end face of fiber array 4.The spatial light modulator 3 of the front end of fiber array 4 is placed on by computer control, to realize to optical fiber array
The 4*4 of row 4 Region control.The spatial light modulator 3 controlled by computer 10 carries out Region control to fiber array 4 so that
Single wavelength laser beam signal is passed sequentially through by region, it is ensured that the beam fibre bundle of fiber array rear end 16, is only had every time per beam fibre bundle
A piece optical fiber has light.The optical signal of 16 beam fibre bundles output is received by microlens array 5 respectively, and converges to photodiode
APD array 6, photodiode APD array 6 converts optical signals to the current signal corresponding with luminous intensity.Mutual impedance is amplified
Current signal is converted into the differential voltage signal of amplification by device array 7, realizes that one-level is amplified to signal；Differential received amplifier battle array
The differential voltage signal that row 8 amplify to one-level carries out secondary amplification, to reach the condition of driving planar laser with vertical cavity array 9；
The a length of 650nm optical signals of the outgoing wave of planar laser with vertical cavity array 9, realize wavelength convert.
Operation principle
4*4 Region controls are realized to fiber array 4 by spatial light modulator 3, it is ensured that every in 16 regions of fiber array
There is optical signal input in secondary only one of which region, can thus make 16 beam fibre bundles of fiber array rear end, every per beam fibre bundle
A secondary only optical fiber has light, and 16 APD receive the optical signal in a region, reduce the crosstalk between detector every time.
Spatial light modulator is mainly based upon the liquid crystal micro display technology of transmission or reflection type, passes through the rotation of liquid crystal molecule
Opticity and birefringence realize corrugated amplitude and the modulation of phase of incident beam.Computer passes through gray level image control
The corresponding amplitude of spatial light modulator planar plate pixel cell, to reach the control to fiber array region.
The transition form of transimpedance amplifier array 7 is transimpedance pattern, can effectively reduce amplifier noise, is improved
Common-mode rejection ratio.
Wavelength is respectively λ1、λ2、λ3Echo-signal after the opto-electronic conversion of photodiode APD array 6, be output as and enter
Penetrate the proportional current signal i of luminous intensity1、i2、i3.Transimpedance amplifier array 7 is by current signal i1、i2、i3Be converted to difference
Voltage signal ± U1、±U2、±U3.The differential received amplifier array 8 of high bandwidth is by ± the U of Differential Input1、±U2、±U3Enter
Two grades of amplifications of row, and be converted to Single-end output Ua、Ub、Uc.Single-end output signal Ua、Ub、UcPlanar laser with vertical cavity is driven respectively
Array 9, is allowed to the laser that launch wavelength is 650nm.
Claims (1)
1. a kind of multispectral sensing Wavelength conversion system based on fiber array, including it is receiving optics, spectro-grating, micro-
Lens array, photodiode APD array, transimpedance amplifier array, differential received amplifier array, planar laser with vertical cavity battle array
Row, computer, it is characterised in that：Comprising spatial light modulator and fiber array, fiber array is located at behind spatial light modulator,
Microlens array is located at behind fiber array, and spatial light modulator is responsible for selecting the light area on fiber array end face
Take, by the laser beam of fiber array outgoing assembled through microlens array after inject photodiode APD array；
Described spatial light modulator is liquid crystal amplitude spatial light modulator, in each imaging process, only one optical fiber array
Row subregion allows laser to pass through, and finally realizes that the optical signal in all regions is received；
Described fiber array front end is 16 × 16 square array, is divided into 4 × 4 sub-regions, is to include 4 per sub-regions
The square array of × 4 optical fiber, wherein, in fiber array front end, per the optical fiber of the i-th row of sub-regions jth row in fiber array
Rear end is bundled into a branch of, forms 16 beam fibre bundles altogether, per beam fibre bundle in containing 16 optical fiber, in each imaging process, when
When any one subregion is illuminated, an only optical fiber has optical signal transmission in every beam fibre bundle, and all optical fiber are many
Mode fiber；
Described photodiode APD array is spliced by independent photodiode APD probe units, in fiber array
One photodiode APD array probe unit of correspondence per a branch of fibre bundle, each time in imaging process, the sub-district of fiber array
In domain, only only one of which subregion allows to receive optical signal, but all photodiode APD probe units can be received
Optical signal；
System job step is：Post-concentration is received by the received optical system of mixing multiwavelength laser beam that object reflects extremely to divide
Light grating, spectro-grating will mix multiwavelength laser light beam light splitting post-concentration to fiber array front end face, be placed on fiber array
The spatial light modulator of front end is by computer control, to realize that the selection to fiber array end face light area is controlled, optical fiber array
The laser pulse signal of row output is received by microlens array and focuses to photodiode APD array, and laser signal is through photoelectricity
Opto-electronic conversion and electric signal amplification are realized after diode APD array, transimpedance amplifier array and differential received amplifier array,
To reach the condition for meeting driving planar laser with vertical cavity, wavelength convert is finally realized.
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| 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 |
| 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 |
| US10222474B1 (en) * | 2017-12-13 | 2019-03-05 | Soraa Laser Diode, Inc. | Lidar systems including a gallium and nitrogen containing laser light source |
| 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 |
| 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 |
| JP6890631B2 (en) * | 2019-06-06 | 2021-06-18 | 京セラ株式会社 | Optical connector and power supply device of optical fiber power supply system and optical fiber power supply system |
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