CN205608187U - Relevant doppler's laser wind finding radar of multi -wavelength light beam synthesis - Google Patents
Relevant doppler's laser wind finding radar of multi -wavelength light beam synthesis Download PDFInfo
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- CN205608187U CN205608187U CN201620208007.7U CN201620208007U CN205608187U CN 205608187 U CN205608187 U CN 205608187U CN 201620208007 U CN201620208007 U CN 201620208007U CN 205608187 U CN205608187 U CN 205608187U
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Abstract
The utility model discloses a relevant doppler's laser wind finding radar of multi -wavelength light beam synthesis, including multi -wavelength laser lamp -house module, radar receiving and dispatching optical antenna module, signal receiving and processing module, multi -wavelength laser lamp -house module includes the narrow linewidth seed light source of the continuous laser of output line polarization, electro -optical waveguide phase modulator that be connected with the output of narrow linewidth seed light source and loading modulating signal and offset voltage, and fiber splitter with electro -optical waveguide phase modulator's output is connected and the acoustic optic modem of loading pulse chopping signal with fiber splitter's an output. The utility model discloses realize that is improved a transmission laser power, increase the synthetic coherent laser wind finding radar of multi -wavelength of echo SNR, it is applicable in applications such as meteorological monitoring, aviation safety precaution, wind energy resources aassessments.
Description
Technical field
This utility model belongs to meteorological radar sounding technical field, specifically, relates to the coherent Doppler LDV technique of a kind of multi-wavelength beam synthesis.
Background technology
Atmospheric wind is the major impetus of the material such as atmosphere moisture, aerosol circulation, has very important researching value in the researchs such as weather forecast, earth environment and Dynamic Meteorology.LDV technique compared with tradition instrument for wind measurement in terms of spatial and temporal resolution, rate accuracy the most more advantage, it is possible to quick obtaining high accuracy wind field data.LDV technique has become as the important means measuring wind field at present.
LDV technique is broadly divided into two classes by measuring method, is respectively as follows: incoherent laser doppler windfinding radar and coherent Doppler LDV technique.Wherein coherent Doppler LDV technique mainly uses 10.6 mum wavelength CO2Laser instrument as lasing light emitter, such as 1980 NASA (NASA) the pulse laser Doppler anemometry radars for measuring clear-air turbulence developed.The eighties in last century starts, due to developing rapidly of small-sized tunable solid laser, coherent technique company of the U.S. successively have developed 1.06 mu m coherent laser windfinding radars based on solid state laser and based on Tm, 2.1 mu m coherent laser windfinding radars of Ho:YAG laser instrument, are respectively used to measure atmospheric wind and wind shear detection.Within 2002, american lockheed-LMT has issued commercial coherent laser windfinding radar system WindTracer.Along with erbium-doped fiber amplifier and the development of optical fiber technology, all-fiber pulse coherence LDV technique working in 1.55 μm is paid attention to by scholar.In 2002, QinetiQ company of Britain reported 1.54 μm pulse coherence LDV technique based on optical fiber technology.The Galion series coherent laser windfinding radar maximum detectable range that SgurrEnergy company of Britain releases is 4km.Leosphere company of France has issued the WINDCUBE series of products for meteorological research in December, 2006, and its representative products has WINDE IRIS, WINDCUBE7/8/10, WINDCUBE V2, WINDCUBE100S/200S/400S etc., maximum detectable range 10km.2011, Akbulut of FiberTek company of the U.S. et al. reported the coherent laser windfinding radar of hunter wake flow.Japanese mitsubishi electric company limited started to research and develop the commercial model machine of all-fiber Impulse Coherent Laser Radar from 2004, within 2005, developed the LR-05FC series of products of commercialization.Domestic the 1.54 mu m all-fiber coherent laser windfinding radars for the detection of the PBL wind profile are reported at glazing in 2014.2014, Chinese Marine University reported its 1.55 mu m all-fiber coherent laser windfinding radars utilized for wind energy research and development developed.2011 to 2014 years, Southwest Inst. of Technical Physics reported the progress in terms of continuous wave, pulse regime and airborne laser Doppler anemometry radar.
In above-mentioned coherent laser windfinding radar, all use the narrow linewidth laser of Single wavelength as launching light source, utilize light heterodyne method to detect aerosol laser Doppler shift inverting atmospheric wind.Due to the impact of nonlinear effect, the narrow linewidth laser output of Single wavelength is limited, thus limit radar measure distance farthest.
Utility model content
In order to overcome problem above, the purpose of this utility model is the coherent Doppler LDV technique providing a kind of multi-wavelength beam to synthesize, the narrow linewidth laser output solving existing Single wavelength is limited, thus limit the farthest problem measuring distance of radar, this utility model improves launches laser power, increases radar surveying distance.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The coherent Doppler LDV technique of a kind of multi-wavelength beam synthesis, including multiple wavelength laser light source module, radar transmit-receive optical antenna module, signal receiving processing module；Described multiple wavelength laser light source module includes the narrow linewidth seed light source of output lead polarization continuous laser, also load-modulate signal and the electro-optical transducer phase-modulator of bias voltage that input is connected with the outfan of narrow linewidth seed light source, the fiber optic splitter that input is connected with the outfan of electro-optical transducer phase-modulator, is connected and the acousto-optic modulator of load pulses chopping signal with an outfan of fiber optic splitter；Described radar transmit-receive optical antenna module is connected with the outfan of acousto-optic modulator, and signal receiving processing module is connected with another outfan of radar transmit-receive optical antenna module and fiber optic splitter.
The principle of multiple wavelength laser light source is: single-frequency laser comprises many single-frequency lasers of multiple effective frequency composition via creating after fiber waveguide phase modulator modulation, the integral multiple that frequency interval is sinusoidal modulation signal frequency between each effective frequency content.The bias voltage of electro-optical transducer phase-modulator it is applied to, it is possible to realize other sideband and pressed down, and light carrier, ± 1 rank sideband coexist by regulation, and the situation that three wavelength light power is basically identical.In this case, single-frequency laser is modulated to the single-frequency laser of three wavelength after electro-optical transducer phase-modulator.The single-frequency laser of three wavelength is sent to acousto-optic modulator and is modulated to pulse laser output after separating low power Radar Local-oscillator light, carry out shift frequency simultaneously.
As preferably, described narrow linewidth seed light source exports the linear polarization continuous laser of 1.5 mum wavelengths, and this narrow linewidth seed light source is by single mode narrow linewidth semiconductor laser, or DBR/DFB optical fiber laser, or the output of solid state laser band tail optical fiber.
Further, described sinusoidal modulation signal and pulse chopping signal are exported by radio-frequency signal source, sinusoidal modulation signal is loaded into electro-optical transducer phase-modulator by electrooptic modulator driver, and pulse chopping signal is loaded into acousto-optic modulator by acoustooptic modulator driver.
Further, the outfan of acousto-optic modulator is connected with radar transmit-receive optical antenna module by fiber amplifier.Pulse laser is launched by radar transmit-receive optical antenna after fiber amplifier amplifies.Described fiber amplifier is the one of single-mode optical fiber amplifier, double-cladding fiber amplifier, or both combine the multi-stage fiber amplifier of composition.
Specifically, described radar transmit-receive optical antenna module includes the optical circulators that input is connected with the outfan of fiber amplifier, the optical transmitting and receiving scanning antenna being connected with optical circulators.
Specifically, described signal receiving processing module includes the optical-fiber bundling device that another outfan is connected, the other end is connected of one end and fiber optic splitter with optical circulators, the balance photodetector that input is connected with the outfan of optical-fiber bundling device, the signal acquisition process module that input is connected with the outfan of balance photodetector, the embedded computer that input is connected with the outfan of signal acquisition process module.The optical echo being carried wind field information by atmospheric aerosol back scattering is received by radar transmit-receive optical antenna, the heterodyne beat signal that echo-signal and Radar Local-oscillator combiner produce is by balancing photodetector detection, signal acquired and process after send into embedded computer carry out Wind-field Retrieval, obtain wind direction and the wind speed profile of wind field.
Yet further, described sinusoidal modulation signal frequency is more than the detective bandwidth of 1.5 times of balance photodetectors.Mutual coherent signal between three wavelength lasers will not be balanced photodetector response.
The beneficial effects of the utility model are:
(1) this utility model has the feature of narrow linewidth.Outside narrow linewidth seed light source laser cavity, realize wavelength-modulated, wavelength modulation process retains the narrow linewidth characteristic of seed source.
(2) this utility model has the advantages that radar emission laser peak power is high.Phase modulation is used to introduce additional phase-modulation by electro-optical transducer phase-modulator to laser, part energy is distributed in the side frequency of laser, thus reduce the energy density of luminous power spectrum, realize the suppression of stimulated Brillouin scattering effect in fiber amplifier with this, under conditions of light carrier, ± 1 rank sideband wavelength luminous power are basically identical, output can be improved twice by fiber amplifier.
(3) this utility model has the advantages that Signal-to-Noise is high.The power of fiber amplifier output improves, the laser of radar emission more high-peak power, and under equal conditions echo-signal is higher, and beat signal signal to noise ratio is higher, easily identifies and extracts.
(4) this utility model has the output of optical component band tail optical fiber, laser structure all-fiber and the feature of optical transmitting and receiving antenna all-fiber.
(5) this utility model Output of laser has the feature of eye-safe.
(6) this utility model has the feature of output lead polarization laser.
Accompanying drawing explanation
Fig. 1 is system schematic diagram of structure of the present utility model.
In above-mentioned accompanying drawing, component names corresponding to reference is as follows:
1-narrow linewidth seed light source, 2-electro-optical transducer phase-modulator, 3-fiber optic splitter, 4-acousto-optic modulator, 5-fiber amplifier, 6-optical circulators, 7-optical transmitting and receiving scanning antenna, 8-optical-fiber bundling device, 9-balances photodetector, 10-signal acquisition process module, 11-embedded computer, 12-electrooptic modulator driver, 13-acoustooptic modulator driver, 14-radio-frequency signal source.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.Embodiment of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1, the coherent Doppler LDV technique of a kind of multi-wavelength beam synthesis, including narrow linewidth seed light source 1, electro-optical transducer phase-modulator 2, fiber optic splitter 3, acousto-optic modulator 4, fiber amplifier 5, optical circulators 6, optical transmitting and receiving scanning antenna 7, optical-fiber bundling device 8, balance photodetector 9, signal acquisition process module 10, embedded computer 11, electrooptic modulator driver 12, acoustooptic modulator driver 13, radio-frequency signal source 14；nullWherein，The outfan of narrow linewidth seed light source 1 is connected with the input of electro-optical transducer phase-modulator 2，The sinusoidal modulation signal output port of radio-frequency signal source 14 is connected with the input of electrooptic modulator driver 12，The outfan of electrooptic modulator driver 12 is connected with the input of electro-optical transducer phase-modulator 2，The outfan of electro-optical transducer phase-modulator 2 is connected with fiber optic splitter 3，The input of optical-fiber bundling device 8 is connected with an outfan of fiber optic splitter 3，The input of acousto-optic modulator 4 is connected with another outfan of fiber optic splitter 3，The pulse chopping signal output port of radio-frequency signal source 14 is connected with acoustooptic modulator driver 13，Acoustooptic modulator driver 13 is connected with the input of acousto-optic modulator 4，The outfan of acousto-optic modulator 4 connects the input of fiber amplifier 5，The outfan of fiber amplifier 5 connects the input of optical circulators 6，Optical circulators 6 connects optical transmitting and receiving scanning antenna 7；The input of optical-fiber bundling device 8 is connected with optical circulators 6, the outfan of optical-fiber bundling device 8 connects the input of balance photodetector 9, the outfan of balance photodetector 9 connects the input of signal acquisition process module 10, and the outfan of signal acquisition process module 10 connects embedded computer 11.
Operation principle of the present utility model is as follows:
Radio-frequency signal source 14 produces frequency and is sent to electrooptic modulator driver 12 more than the sinusoidal modulation signal of 1.5 times of balance photodetector 9 detective bandwidths, sinusoidal modulation signal and bias voltage are loaded into electro-optical transducer phase-modulator 2 by electrooptic modulator driver 12, narrow linewidth seed light source 1 exports 1.5 micron wave length linear polarization continuous lasers and is sent to electro-optical transducer phase-modulator 2, in electro-optical transducer phase-modulator 2, then there is phase-modulation in linear polarization continuous laser, produce light carrier, ± 1 rank sideband coexists and is sent to fiber optic splitter 3, and the output that three wavelength light power is basically identical.Laser after fiber optic splitter 3 one end output partial modulation as Radar Local-oscillator light and is sent to optical-fiber bundling device 8, and the laser after other end output modulation is sent to acousto-optic modulator 4.Radio-frequency signal source 14 produces pulse chopping signal and is sent to acoustooptic modulator driver 13, modulator driver 13 by pulse chopping signal loading to acousto-optic modulator 4, continuous laser is chopped into pulse laser output, then amplify afterpulse laser through fiber amplifier 5 and enter optical circulators 6, be then transmitted in air by optical transmitting and receiving scanning antenna 7.
The optical echo being carried wind field information by atmospheric aerosol back scattering is received by optical transmitting and receiving scanning antenna 7, optical-fiber bundling device 8 is arrived through optical circulators 6, here the Radar Local-oscillator light with fiber optic splitter 3 output meets and produces heterodyne beat optical signal, the heterodyne beat optical signal of optical-fiber bundling device 8 output is balanced photodetector 9 and detects, balance photodetector 9 will detect heterodyne beat signal and send in signal acquisition process module 10, and signal acquisition process module 10 calculates radially wind speed.Optical transmitting and receiving scanning antenna 7 is after different azimuth scans, the radial direction air speed data of the different azimuth calculated, differing heights is sent into embedded computer 11 by signal acquisition process module 10, embedded computer 11, according to scan position, calculates the horizontal wind speed of search coverage differing heights, wind direction and vertical velocity by Wind-field Retrieval algorithm.
Above technical scheme can realize a kind of raising and launch laser power, increases the coherent laser windfinding radar of the multi-wavelength synthesis of echo signal to noise ratio, is applicable to the applications such as weather monitoring, aviation safety early warning, Evaluation of Wind Energy Resources.
According to above-described embodiment, this utility model just can be realized well.What deserves to be explained is; on the premise of above-mentioned design principle; for solving same technical problem; even if some made on architecture basics disclosed in the utility model are without substantial change or polishing; the essence of the technical scheme used is still as this utility model, therefore it should also be as in protection domain of the present utility model.
Claims (8)
1. the coherent Doppler LDV technique of a multi-wavelength beam synthesis, it is characterised in that include multiple wavelength laser light source module, radar transmit-receive optical antenna module, signal receiving processing module；Described multiple wavelength laser light source module includes the narrow linewidth seed light source (1) of output lead polarization continuous laser, also load-modulate signal and the electro-optical transducer phase-modulator (2) of bias voltage that input is connected with the outfan of narrow linewidth seed light source (1), the fiber optic splitter (3) that input is connected with the outfan of electro-optical transducer phase-modulator (2), is connected with an outfan of fiber optic splitter (3) and the acousto-optic modulator (4) of load pulses chopping signal；Described radar transmit-receive optical antenna module is connected with the outfan of acousto-optic modulator (4), and signal receiving processing module is connected with another outfan of radar transmit-receive optical antenna module and fiber optic splitter (3).
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 1 synthesis, it is characterized in that, described narrow linewidth seed light source (1) exports the linear polarization continuous laser of 1.5 mum wavelengths, this narrow linewidth seed light source is by single mode narrow linewidth semiconductor laser, or DBR/DFB optical fiber laser, or solid state laser generation.
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 1 synthesis, it is characterized in that, described modulated signal is sinusoidal modulation signal, described sinusoidal modulation signal and pulse chopping signal are exported by radio-frequency signal source (14), sinusoidal modulation signal is loaded into electro-optical transducer phase-modulator (2) by electrooptic modulator driver (12), and pulse chopping signal is loaded into acousto-optic modulator (4) by acoustooptic modulator driver (13).
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 3 synthesis, it is characterised in that the outfan of described acousto-optic modulator (4) is connected with radar transmit-receive optical antenna module by fiber amplifier (5).
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 4 synthesis, it is characterized in that, described fiber amplifier (5) is the one of single-mode optical fiber amplifier, double-cladding fiber amplifier, or both combine the multi-stage fiber amplifier of composition.
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 5 synthesis, it is characterized in that, described radar transmit-receive optical antenna module includes the optical circulators (6) that input is connected with the outfan of fiber amplifier (5), the optical transmitting and receiving scanning antenna (7) being connected with optical circulators (6).
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 6 synthesis, it is characterized in that, described signal receiving processing module includes that one end is connected with another outfan of fiber optic splitter (3), the optical-fiber bundling device (8) that the other end is connected with optical circulators (6), the balance photodetector (9) that input is connected with the outfan of optical-fiber bundling device (8), the signal acquisition process module (10) that input is connected with the outfan of balance photodetector (9), the embedded computer (11) that input is connected with the outfan of signal acquisition process module (10).
The coherent Doppler LDV technique of a kind of multi-wavelength beam the most according to claim 7 synthesis, it is characterised in that described sinusoidal modulation signal frequency is more than the detective bandwidth of 1.5 times of balance photodetectors (9).
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785395A (en) * | 2016-03-17 | 2016-07-20 | 四川知周科技有限责任公司 | Multi-wavelength-beam-combination coherent Doppler laser wind measurement radar |
| CN106772439A (en) * | 2017-01-06 | 2017-05-31 | 成都盈风智创激光技术有限公司 | The cabin formula LDV technique and its measuring method of many distance layering measurement wind fields |
| CN107807367A (en) * | 2017-11-02 | 2018-03-16 | 南京牧镭激光科技有限公司 | A kind of coherent wind laser radar apparatus |
| CN109031345A (en) * | 2018-06-13 | 2018-12-18 | 北京经纬恒润科技有限公司 | A kind of MEMS micromirror scanning laser radar system and its scan method |
| CN110308463A (en) * | 2019-07-05 | 2019-10-08 | 珠海光恒科技有限公司 | Windfinding radar system and its working method with data collecting card |
| CN110531378A (en) * | 2019-06-13 | 2019-12-03 | 山西大学 | A kind of Wind turbines continuous wave laser coherent wind radar system |
| WO2020172892A1 (en) * | 2019-02-28 | 2020-09-03 | 华为技术有限公司 | Power control method and apparatus for radar |
| CN112729774A (en) * | 2020-12-03 | 2021-04-30 | 四川知周科技有限责任公司 | Common-path laser ignition and path loss detection device |
| CN113489544A (en) * | 2021-07-05 | 2021-10-08 | 长春理工大学 | Partial coherent light beam generation device and method suitable for long-distance wireless optical communication |
| US20220155426A1 (en) * | 2018-03-15 | 2022-05-19 | Aeva, Inc. | Techniques for Combining Optical Beams into Shared Spatial Mode |
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- 2016-03-17 CN CN201620208007.7U patent/CN205608187U/en not_active Withdrawn - After Issue
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105785395B (en) * | 2016-03-17 | 2018-03-09 | 四川知周科技有限责任公司 | A kind of coherent Doppler LDV technique of multi-wavelength beam synthesis |
| CN105785395A (en) * | 2016-03-17 | 2016-07-20 | 四川知周科技有限责任公司 | Multi-wavelength-beam-combination coherent Doppler laser wind measurement radar |
| CN106772439A (en) * | 2017-01-06 | 2017-05-31 | 成都盈风智创激光技术有限公司 | The cabin formula LDV technique and its measuring method of many distance layering measurement wind fields |
| CN106772439B (en) * | 2017-01-06 | 2023-09-15 | 前郭尔罗斯蒙古族自治县岱旭风能有限公司 | Cabin type laser wind-finding radar for multi-distance layered measurement wind field and measurement method thereof |
| CN107807367A (en) * | 2017-11-02 | 2018-03-16 | 南京牧镭激光科技有限公司 | A kind of coherent wind laser radar apparatus |
| US20220155426A1 (en) * | 2018-03-15 | 2022-05-19 | Aeva, Inc. | Techniques for Combining Optical Beams into Shared Spatial Mode |
| US11982774B2 (en) * | 2018-03-15 | 2024-05-14 | Aeva, Inc. | Techniques for combining optical beams into shared spatial mode |
| CN109031345A (en) * | 2018-06-13 | 2018-12-18 | 北京经纬恒润科技有限公司 | A kind of MEMS micromirror scanning laser radar system and its scan method |
| WO2020172892A1 (en) * | 2019-02-28 | 2020-09-03 | 华为技术有限公司 | Power control method and apparatus for radar |
| CN110531378A (en) * | 2019-06-13 | 2019-12-03 | 山西大学 | A kind of Wind turbines continuous wave laser coherent wind radar system |
| CN110308463B (en) * | 2019-07-05 | 2023-12-15 | 珠海光恒科技有限公司 | Wind-finding radar system with data acquisition card and working method thereof |
| CN110308463A (en) * | 2019-07-05 | 2019-10-08 | 珠海光恒科技有限公司 | Windfinding radar system and its working method with data collecting card |
| CN112729774A (en) * | 2020-12-03 | 2021-04-30 | 四川知周科技有限责任公司 | Common-path laser ignition and path loss detection device |
| CN113489544A (en) * | 2021-07-05 | 2021-10-08 | 长春理工大学 | Partial coherent light beam generation device and method suitable for long-distance wireless optical communication |
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