CN101710178A - Real-time calibration high spectral resolution lidar device - Google Patents
Real-time calibration high spectral resolution lidar device Download PDFInfo
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- CN101710178A CN101710178A CN200910231371A CN200910231371A CN101710178A CN 101710178 A CN101710178 A CN 101710178A CN 200910231371 A CN200910231371 A CN 200910231371A CN 200910231371 A CN200910231371 A CN 200910231371A CN 101710178 A CN101710178 A CN 101710178A
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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
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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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
- G01S7/497—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention relates to a real-time calibration high spectral resolution lidar device for measuring atmospheric wind field. The invention comprises a transmitting system composed of a pulse laser, a beam expander and a reflector, a receiving system composed of a telescope, optical filters, a molecular iodine filter, beam splitters and photoelectric detectors, a data acquisition system connected with the photoelectric detectors, and a data processing computer. The invention is characterized by also comprising two receiving channels of the rotational Raman, and the two receiving channels of the rotational Raman are connected in parallel by the beam splitters, extracts atmospheric molecule rotational Raman spectrum from the original detecting signal, and connected with the data acquisition system, the data acquisition system is connected with the data processing computer and transmits the acquired information to the data processing computer. The invention is characterized in that gasoloid relative concentration and atmospheric parameters are obtained from primary optical detection, and simultaneously wind speed refutation is carried out, measurement efficiency and measurement accuracy are improved with the wind speed measurement accuracy reaching 1m/s.
Description
Technical field
The present invention relates to a kind of device of laser measurement atmospheric wind, a kind of real-time calibration high spectral resolution lidar device of measuring atmospheric wind of more specifically saying so.
Background technology
Atmospheric wind is the important parameter in the meteorological observation, all has important use to be worth in fields such as weather, weather, ocean, environment and traffic, Aeronautics and Astronautics.High spectral resolution lidar can obtain the atmospheric wind data of high precision high-spatial and temporal resolution, for numerical weather forecast provides primary data, improves the observation and the prediction ability of Small and Medium Sized diastrous weather; For wind power plant provides the wind field monitoring, improve generator power; Also can be fast, accurately turbulent flow, wind shear etc. have a strong impact on the atmospheric strument of aircraft safety in the survey mission whole process, for flight navigation provides safety guarantee.
The current anemometry laser radar that is used for the atmospheric wind measurement mainly is divided into coherent wind laser radar and incoherent anemometry laser radar.The coherent wind laser radar can only act on the higher low dummy section of aerosol load.Non-coherent detection technology (being called high spectral resolution technology, direct detection technology again) changes by the signal strength detection that high-resolution spectral analysis device comes the direct detection frequency change to cause, and then ask for wind speed, can measure atmospheric molecule and gasoloid scattered signal, survey the atmospheric wind of height 0.5km～20km.Based on the high spectral resolution lidar of iodine molecule wave filter, be typical case's representative of non-coherent technique.It utilizes a certain absorption line (selecting 1109 absorption lines for use as 532nm laser) of iodine molecule wave filter as the wave filter of differentiating Doppler shift, to launch laser frequency lock in the edge center place that absorbs line, the echoed signal of atmospheric backscatter is by the iodine pond, in the variation of the transmitance when then Doppler shift will embody rear orientation light by the iodine molecule wave filter (convolution of iodine molecule spectral absorption line and scattering spectrum), utilize photoelectric detector to record the energy that scattered light signal sees through the iodine pond, and then the inverting transmitance, obtain frequency shift amount and obtain the atmosphere wind speed.
But owing to comprise (the Mie scattering of the distinct aerosol scattering of spectral characteristic in the atmosphere elastic scattering signal that high spectral resolution lidar is surveyed, narrow bandwidth) and atmospheric molecule scattering (Rayleigh scattering, bandwidth is wide), two kinds of scattered signals have nothing in common with each other by the transmitance of frequency discrimination wave filter, therefore, in order accurately to survey wind, must know the relative concentration of gasoloid and molecule in the atmosphere at that time during detection, measure sensitivity (being that the explorer response that 1m/s unit's wind speed causes changes) in order to real-time calibration.High spectral resolution lidar can probe gas colloidal sol relative concentration, but this detection must independently be carried out the time beyond measuring wind speed.This not only needs the outer Measuring Time (emissive power just) of allocation, the more important thing is, aerocolloidal change in time and space is violent, and asynchronous gasoloid can not accurately reflect surveys wind atmospheric condition (above phenomenon is more obvious in small scale synoptic processes such as Ocean Wind-field, PBL WIND FIELD detection) at that time.
In addition, for accurately measuring the Doppler shift of atmospheric molecule scattered signal, high spectral resolution lidar also needs to obtain the temperature information of atmosphere at that time, to proofread and correct the line width of atmospheric molecule scattering spectrum.In the existing anemometry laser radar system, atmospheric temperature information perhaps comes from Atmospheric models (certain regional atmospheric statistics) from other observational datas (as sounding balloon etc.) independently.Therefore the temperature information that adopts does not obtain at survey wind simultaneously, can introduce error unavoidably.
Though the high spectral resolution lidar technology has entered the businessization experimental phase, but still can't obtain gasoloid relative concentration and atmospheric temperature status information accurately in real time, promptly can't measure sensitivity and enter real practicability by real-time calibration.
Summary of the invention
The purpose of this invention is to provide a kind of real-time calibration high spectral resolution lidar device, to remedy the deficiency of prior art.
The present invention is on existing high spectral resolution lidar basis, because it measures passage and reference channel has only comprised the summation information of aerosol scattering and atmospheric molecule scattering, so it is always poor only to detect the energy that produces because of Doppler shift.Consider and obtain gasoloid relative concentration and atmospheric temperature information in real time with accurate survey wind and obtain the importance of more much gas parameters, in existing high spectral resolution lidar receiving system, increase the receiving cable of two rotary Ramans, to extract uncared-for spectral component---inelastic scattering spectrum in the high spectral resolution lidar detectable signal, it is atmospheric molecule rotary Raman spectrum, it comprises the information of atmospheric molecule scattering, can extract aerocolloidal relative concentration.Utilize spectroscope from existing detecting light spectrum, to isolate inelastic scattering spectrum, utilize a slice spectroscope that isolated spectrum is divided into two receiving cables again---rotary Raman passage one and rotary Raman passage two, select for use corresponding narrow band optical filter to extract the rotary Raman spectrum that raises and strengthen with temperature in the passage one, select for use corresponding narrow band optical filter to extract the rotary Raman spectrum that raises and weaken with temperature in the passage two, two passages receive with a photodetector respectively.Being used in combination of two passages both can reduce the influence of temperature to measuring, and obtains accurately gasoloid relative concentration in real time, again can the real-time atmospheric temperature information of inverting.So, just can measure sensitivity by real-time calibration, accurately measure atmospheric wind, solve the technological difficulties of high spectral resolution lidar practicability.
The present invention includes the emission coefficient of forming by pulsed laser, beam expanding lens and catoptron; By telescope, optical filter a, iodine molecule wave filter, spectroscope a and two receiving systems that photodetector is formed; The data acquisition system (DAS) and the data handling machine that are connected with two photodetectors, it is characterized in that it has also comprised by spectroscope b, optical filter b and the rotary Raman passage one that photodetector is formed, with spectroscope c, optical filter c and the rotary Raman passage two that photodetector is formed, and these two rotary Raman passages are via the spectroscope b of passage one, separate the spectrum that comes from existing receiving system spectroscope a transmission and transmit inelastic scattering spectrum, and the spectroscope b by passage two between these two passages links to each other, be connected with data acquisition system (DAS) again, and import the information of gathering into data handling machine through data acquisition system (DAS).
Major advantage of the present invention is: can obtain many atmosphere parameters (atmospheric molecule backscattering coefficient, gasoloid backscattering coefficient, Aerosol Extinction, atmospheric temperature) and wind speed simultaneously, the efficiency of measurement height in a photodetection.The gasoloid relative concentration information of obtaining in real time can significantly reduce the measuring error of introducing because of the gasoloid change in time and space; The synchronous atmospheric temperature information of obtaining in real time can reduce the inversion error of utilizing the statistics Atmospheric models to introduce, and the average error amount is reduced in original 30%, and the measuring wind speed precision reaches 1m/s, real-time calibration, accuracy of measurement height.
Description of drawings
The present invention will be further described below in conjunction with accompanying drawing.
Fig. 1, general structure block diagram of the present invention.
Wherein, 1. pulsed laser 2. beam expanding lenss 3. catoptrons 4. telescopes 5. optical filter a 6. spectroscope a7. spectroscope b 8. spectroscope c 9. iodine molecule wave filters 10. optical filter b 11. optical filter c 12. photodetectors 13. photodetectors 14. photodetectors 15. photodetectors 16. data acquisition system (DAS)s 17. data handling machines.
Embodiment
As Fig. 1, the present invention includes the emission coefficient of forming by pulsed laser 1, beam expanding lens 2 and catoptron 3; The receiving system of forming by telescope 4, optical filter a5, spectroscope a6, iodine molecule wave filter 9, photodetector 12 and photodetector 13; With photodetector 12, data acquisition system (DAS) 16 that photodetector 13 is connected and data handling machine 17, it is characterized in that it also comprises the spectroscope b7 that transmitted light arrived by spectroscope a6, and by spectroscope b7, optical filter b10, the rotary Raman passage one that photodetector 14 is formed, with spectroscope c8, optical filter c11, the rotary Raman passage two that photodetector 15 is formed, and two rotary Raman passages link to each other by spectroscope c8 each other, photodetector 14 all is connected with data acquisition system (DAS) 16 again with photodetector 15, and the information of gathering is imported into data handling machine 17 and measured atmospheric scattering parameter, the accurate measuring wind of real-time calibration sensitivity simultaneously through data acquisition system (DAS) 16.
Above-mentioned pulsed laser 1 can adopt existing pulsed laser, as various solid state lasers, fiber laser, and single longitudinal mode frequency stabilization (wavelength is 532.25nm).For example, select the frequency multiplication Nd:YAG pulsed laser of photonics company for use, single pulse energy 600mJ, repetition frequency 50KHz adopts the seed implantttion technique.
All-purpose telescopes such as that above-mentioned telescope 4 can adopt is reflective, catadioptric formula, for example the 820mm Cassegrainian telescope produced of U.S. Celestron company.Beam expanding lens 2 can select for use 10 times to expand getting final product of bundle.
Above-mentioned optical filter a 5 is the logical optical filter (wavelength coverage: 528.2nm～532.8) of band, optical filter b 10 and optical filter c 11 are narrow band optical filter (centre wavelength for not Wei 531.1nm and 528.5nm), can select interference filter, Fabry-Perot etalon or faraday anomalous dispersion wave filter for use.
The band-pass filter that above-mentioned spectroscope a 6, spectroscope b 7 and spectroscope c 8 change with incident angle for transmitance can be selected interference filter, grating splitting system or Fabry-Perot etalon for use.
Iodine molecule wave filter 9 can adopt the long iodine pond of 15cm, and clear aperture should be slightly larger than light beam.
Above-mentioned photodetector 12,13,14 and 15, photoelectric detector for same type kind, photodiode, photomultiplier or the charge-coupled device (CCD) of high sensitivity and high-speed response can be selected for use, the photomultiplier Electron tubes 9893/350 of the river in Jiangsu Province which flows into the Huangpu River of Shanghai, shore photon company can be selected for use.
Data acquisition system (DAS) 16 can be selected the TR16-160 data acquisition system (DAS) of German Licel company for use.
Pulsed laser 1 emitted light beams of the present invention is transmitted in the middle of the atmosphere through catoptron 3, by atmospheric molecule or aerosol scattering after expanding the bundle compression angle of divergence through beam expanding lens 2.And the motion-wind of atmosphere can make the centre frequency of scattered light produce Doppler shift.After the scattered light of above-mentioned atmosphere is collected by telescope 4, by optical filter a 5 compression sky background radiation, then by spectroscope a 6, spectroscope b 7 and spectroscope c 8 gating beam split, enter the measurement passage of band iodine molecule wave filter 9 respectively, the reference channel of direct photometry flux, the rotary Raman passage two of the rotary Raman passage one of band optical filter b 10 and band optical filter c 11.Four passages utilize photodetector 12,13,14 and 15 these four photodetectors to carry out opto-electronic conversion respectively, the electric signal input data acquisition system (DAS) 16 that obtains, by data acquisition system (DAS) 16 with the electric signal digitizing, be aggregated into data handling machine 17 and carry out complementary operation, obtain real-time gasoloid relative concentration and atmospheric temperature, accurately calculate the atmospheric molecule backscattering coefficient, the gasoloid backscattering coefficient, Aerosol Extinction and Doppler shift amount obtain atmospheric wind.
Claims (5)
1. a real-time calibration high spectral resolution lidar device comprises the emission coefficient of being made up of pulsed laser (1), beam expanding lens (2) and catoptron (3); The receiving system of forming by telescope (4), optical filter a (5), spectroscope a (6), iodine molecule wave filter (9), photodetector (12) and photodetector (13); With photodetector (12), data acquisition system (DAS) (16) that photodetector (13) is connected and data handling machine (17), it is characterized in that it also comprises the spectroscope b (7) that transmitted light arrived by spectroscope a (6), and by spectroscope b (7), optical filter b (10), the rotary Raman passage one that photodetector (14) is formed, with spectroscope c (8), optical filter c (11), the rotary Raman passage two that photodetector (15) is formed, and two rotary Raman passages link to each other by spectroscope c (8) each other, photodetector (14) all is connected with data acquisition system (DAS) (16) again with photodetector (15), and through data acquisition system (DAS) (16) information of gathering is imported into data handling machine (17) and measured the atmospheric scattering parameter simultaneously.
2. real-time calibration high spectral resolution lidar device as claimed in claim 1 is characterized in that above-mentioned simultaneously-measured atmospheric scattering parameter is atmospheric molecule elastic scattering, Raman scattering and gasoloid scattering parameter.
3. real-time calibration high spectral resolution lidar device as claimed in claim 1 is characterized in that above-mentioned optical filter a (5) is the logical optical filter of band, wavelength coverage: 528.2nm～532.8nm.
4. real-time calibration high spectral resolution lidar device as claimed in claim 1 is characterized in that above-mentioned optical filter b (10) is a narrow band optical filter, and centre wavelength is 531.1nm.
5. real-time calibration high spectral resolution lidar device as claimed in claim 1 is characterized in that above-mentioned optical filter c (11) is a narrow band optical filter, and centre wavelength is 528.5nm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910231371A CN101710178B (en) | 2009-12-04 | 2009-12-04 | Real-time calibration high spectral resolution lidar device |
| PCT/CN2010/079437 WO2011066808A1 (en) | 2009-12-04 | 2010-12-03 | High-spectrum resolution laser radar device with real-time calibration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910231371A CN101710178B (en) | 2009-12-04 | 2009-12-04 | Real-time calibration high spectral resolution lidar device |
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| CN101710178A true CN101710178A (en) | 2010-05-19 |
| CN101710178B CN101710178B (en) | 2012-10-10 |
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| CN200910231371A Expired - Fee Related CN101710178B (en) | 2009-12-04 | 2009-12-04 | Real-time calibration high spectral resolution lidar device |
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| WO (1) | WO2011066808A1 (en) |
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| WO2011066808A1 (en) * | 2009-12-04 | 2011-06-09 | 中国海洋大学 | High-spectrum resolution laser radar device with real-time calibration |
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| CN110865395B (en) * | 2019-11-11 | 2023-03-28 | 西北工业大学 | Laser radar data asynchronous acquisition synchronous processing method |
| CN110865395A (en) * | 2019-11-11 | 2020-03-06 | 西北工业大学 | Laser radar data asynchronous acquisition synchronous processing method |
| CN110865396A (en) * | 2019-11-25 | 2020-03-06 | 浙江大学 | Frequency sweep calibration device and method for high spectral resolution laser radar |
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| CN111458726A (en) * | 2020-04-19 | 2020-07-28 | 青岛镭测创芯科技有限公司 | Atmospheric aerosol analysis method based on coherent laser radar spectrum intensity data |
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| CN112859112A (en) * | 2021-01-11 | 2021-05-28 | 南京晓庄学院 | Wind temperature detection laser radar and method based on rotating Raman-Doppler mechanism |
| CN112859112B (en) * | 2021-01-11 | 2024-03-26 | 南京晓庄学院 | Wind temperature detection laser radar and method based on rotating Raman-Doppler mechanism |
| CN113776565A (en) * | 2021-07-06 | 2021-12-10 | 田斌 | Underwater Brillouin scattering spectrum measuring device and measuring method |
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| WO2011066808A1 (en) | 2011-06-09 |
| CN101710178B (en) | 2012-10-10 |
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