CN1740818A - Calibration device and calibration method for Rayleigh wind lidar - Google Patents
Calibration device and calibration method for Rayleigh wind lidar Download PDFInfo
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Abstract
The invention relates to a calibration device and a calibration method suitable for a Rayleigh wind lidar, which are based on the principles of acousto-optic frequency shift and laser spectrum Doppler broadening, realize the continuous adjustment of a broadband with the laser frequency of 0 by connecting two acousto-optic frequency shifters with adjustable frequencies in series, and accurately and rapidly calibrate the Rayleigh wind lidar by expanding the spectrum by using the Doppler broadening. In the rayleigh wind lidar, the inversion of the wind speed is that the wind speed v is calculated by the frequency shift f according to the energy ratio R of the two channels and the corresponding frequency shift f, and the energy ratio R of the two channels is obtained by actual measurement in the wind speed measurement, so the rayleigh wind lidar must be calibrated before the wind speed measurement, that is, the corresponding relation between each energy ratio R and f, that is, the relation between R and the wind speed v is found out. The invention can conveniently and rapidly calibrate the Rayleigh wind lidar.
Description
Technical field
The present invention relates to laser radar, particularly a kind of caliberating device of Rayleight windfinding laser radar and scaling method thereof.
Background technology
The global atmosphere wind field has extremely important status in atmospheric dynamics, weather, meteorology, be the major impetus of aqueous vapor, gasoloid, carbon cycle and the exchange of extra large gas; It is requisite parameter in numerical weather forecasting, transmission research, the power meteorological research.It is a kind of powerful measure of present measuring wind speed that Doppler lidar is surveyed wind, its principle is as follows: in general, the translational speed of atmospheric molecule can be thought and equals wind speed, when laser interacted with the atmospheric molecule that is moving, because Doppler effect, laser frequency will change, and Δ v=2V/ λ is arranged, wherein Δ v is the laser frequency variable quantity, and V is the atmospheric molecule translational speed, and λ is the shoot laser wavelength.By formula as can be known, the size according to laser frequency changes can obtain the atmospheric molecule translational speed, is the size of wind speed.Dual edge Rayleight windfinding laser radar (hereinafter to be referred as Rayleight windfinding laser radar) is a kind of of direct detection Doppler lidar, and Fig. 4 is the structural representation of its light signal receiving-member 9.The atmospheric backscatter signal is collected after signal collection optical fiber 8 enters receiving-member 9 by telescope.The working condition of receiving-member 9 is as follows: filter background noise by wave filter 91 from the light signal of signal collection optical fiber 8 outgoing after collimating, send into the spectral analysis parts then.The spectral analysis parts are the very high two Fabry-Perot interferometers 92 of smooth finish, its principal feature is that two parts chamber length has a small difference up and down, thereby form two spectral shape is identical and centre frequency has two high-resolution spectras of certain intervals, play the effect of two interferometers, two interferometers use as frequency discriminator, first photomultiplier 93, second photomultiplier, 94 correspondences with the back form two energy channels, i.e. first energy channel and second energy channels respectively.Utilize the chamber of the two Fabry-Perot interferometers 92 of piezoelectric ceramics adjusting long, make the spectrum of two interferometers be distributed in the both sides of shoot laser spectrum symmetrically, thus theoretically during 0 wind speed the energy ratio (hereinafter to be referred as the energy ratio of two passages) of corresponding two passages should be 1; When laser frequency changes, laser frequency to the centre frequency of an interferometer near and away from the centre frequency of another interferometer, cause the detection energy of an energy channel to increase, and another channel energy reduces, and the energy ratio of two passages and frequency shifts are single corresponding relations, therefore, can determine the size that laser frequency changes by the energy ratio of two passages.Because Rayleigh lidar is present unique instrument that can carry out global wind field measurement except that microwave scatterometer, west various countries research institution such as NASA (NASA), CNRS (French national research centre), OSA (European Space Agency) fall over each other to carry out the development work of Rayleight windfinding laser radar, and have obtained suitable progress.But, make a general survey of the Rayleight windfinding radar research situation of each research institution and be not difficult to find that the wind speed calibration of Rayleight windfinding laser radar is the development difficult point of this system.Because the singularity of atmospheric molecule back scattering spectrum is compared with the demarcation of Mie scattering laser radar system, the method for hard target scattering is difficult to be used in Rayleight windfinding laser radar.
At first have a look the Rayleight windfinding laser radar scheme of NASA, NASA has carried out deep theoretical analysis to Rayleight windfinding laser radar, in order to take into account gasoloid and molecular scattering is optimized interferometer, determined size at interval between the width of dual edge spectrum and the spectrum, and having developed Rayleight windfinding laser radar, its measuring wind speed result also can coincide preferably with the result of sounding balloon measuring wind speed.But, from the paper that NASA publishes, can not find scaling method about this Rayleight windfinding laser radar.We think to have two kinds its reason: one, and the interferometer process technology of NASA is better, can make the very high interferometer of optical quality according to notional result, can replace system calibrating by notional result in the measuring wind speed; Two, NASA radar system calibration technique is not easy to publish.We think that wherein second kind of possibility is bigger.Have a look the system calibrating scheme of CNRS again, the laser radar system of CNRS is placed on interferometer in the box of sealing, change the cassette interior gas pressure intensity by the step motor drive piston, the refractive index of cassette interior gas is changed, the interferometer striped is moved.During its system calibrating, suppose that laser spectrum is known, get the sub-fraction shoot laser and enter light signal collection optical fiber, illuminate interferometer behind the collimation.Progressively change cassette interior pressure by stepper motor and record respective signal.Utilize the method for deconvolution to obtain the spectrum of interferometer then.Provide the response function of interferometer in conjunction with the theory of atmospheric molecule back scattering spectrum.Bibliographical information by CNRS knows that September nineteen ninety-five and in May, 1996, CNRS did a series of radar staking-out work, and twice calibration result has tangible difference, and wherein the laser radar calibration result has very big error nineteen ninety-five.Obviously adopt the scaling method of CNRS, the staking-out work of laser radar still all has certain shortcoming from demarcating on the efficient from accuracy.In fact, when the interferometer internal pressure changes, because the tension effect of interferometer inner structure, the interferometer defect parameters is changed, in addition, also can cause spectrum to be widened to the interferometer uneven irradiation, all difficulties all make the spectrometric uncertainty of interferometer increase.And, the factors such as the angle of divergence that in the laser radar calibration process, relate to deconvolution, molecule back scattering theory and laser, therefore, even do not consider the error of this scaling method, the demarcation scheme of CNRS also can not can both make things convenient for accurately before each measuring wind speed and carry out.Yet, general anemometry laser radar is in order to reach the purpose of accurate measuring wind, must carry out the preceding staking-out work of each measuring wind speed, its reason mainly contains following 2 points: the laser spectrum drift when at first being 0 wind speed, according to the laser radar principle, the emission laser spectrum should be in the centre position of interferometer two spectrum, for reaching this purpose, we have also adopted feedback system to make the spectrum of interferometer follow the drift of laser spectrum, but the emission laser spectrum still departed from the interferometer center during actual wind speed was measured in general, this moment, the energy ratio of two passages no longer was 1 during 0 wind speed, but one and interferometer, the laser works state, even the relevant numerical value of environmental factor, the energy ratio of corresponding two passages of corresponding with it other wind speed also changes, if the Wind Speed Inversion as a result of demarcating with previous system must be brought air speed error again.Laser spectrum drift is floated slowly, can think and carry out measuring wind speed after the demarcation immediately by spectrum-stable doing in the time (nominal time+measuring wind speed time) than the casual labourer, then can eliminate the error that is caused by 0 wind speed laser drift.Secondly, laser radar light path accuracy requirement is very high, in transit jolt in addition environment change all can make system light path that small variation takes place, thereby require to carry out system calibrating before each the measurement.Above-mentioned various reasons shows that there is certain defective in the scaling method of CNRS, and except that NASA, CNRS, we also investigate the data of other each laser research institutions, all find no the scaling method of reasonable Rayleight windfinding laser radar.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency that overcomes existing Rayleight windfinding laser radar system calibrating scheme, a kind of caliberating device and scaling method thereof that is applicable to Rayleight windfinding laser radar is provided, and it should be able to make things convenient for, promptly Rayleight windfinding laser radar be demarcated.
The basis of Rayleight windfinding laser radar scaling method of the present invention is to utilize acousto-optic shift frequency and laser spectrum dopplerbroadening principle, it uses the acousto-optic frequency shifters series connection of two frequency adjustable to realize that the broadband of the mistake 0 of laser frequency regulates continuously, and utilizes the dopplerbroadening device to make spectral evolution and the Rayleight windfinding radar is carried out accurately, demarcates rapidly.In Rayleight windfinding laser radar, the inverting of wind speed is according to the energy ratio R of two passages and corresponding shift frequency f, by shift frequency f calculation of wind speed v, that actual measurement obtains in measuring wind speed is the energy ratio R of two passages, so must before measuring wind speed, demarcate to Rayleight windfinding laser radar, promptly find out the corresponding relation of each energy ratio R and f, i.e. the relation of R and wind speed v.The present invention can make things convenient for, promptly Rayleight windfinding laser radar be demarcated.
Technical solution of the present invention is as follows:
A kind of caliberating device that is applicable to Rayleight windfinding laser radar, it is characterized in that this system comprises a laser instrument, along being made up of attenuator, first acousto-optic frequency shifters, second sound optical frequency shifter and dopplerbroadening device successively on the laser output light path of this laser instrument, the output terminal of described dopplerbroadening device joins by the receiving-member of signal collection optical fiber and Rayleight windfinding laser radar.
Also be inserted with first catoptron and second catoptron in the front and back of described attenuator, so that the laser that laser instrument is sent imports the caliberating device of Rayleight windfinding laser radar.
Described laser instrument is that an optical maser wavelength is the laser instrument of 355nm.
The centre frequency of described first acousto-optic frequency shifters is 400MHz, and the frequency adjustable scope is 400+30MHz, and its Bragg angle is 2.04 °; The centre frequency of described second sound optical frequency shifter is 460MHz, and the frequency adjustable scope is 460+30MHz, and its Bragg angle is 2.34 °.
Described dopplerbroadening device is the cylindrical container of an inwall blacking, its front end face complete closed, rear end face has the aperture for laser incident and the insertion of signal collection optical fiber, the periphery from-inner-to-outer of this cylindrical container is coated with heating lamella and heat insulation layer, described heating lamella links to each other with a Switching Power Supply, and this Switching Power Supply links to each other with a temperature controller and works under the control of this temperature controller.
The temperature of described dopplerbroadening device internal gas is controlled at ± 0.1 ℃ fluctuating scope in.
A kind ofly utilize described Rayleight windfinding laser radar caliberating device to carry out the scaling method of Rayleight windfinding laser radar, this method comprises the following steps:
1. first catoptron and second catoptron are inserted in the light path, the laser that laser instrument is sent imports the Rayleight windfinding laser radar caliberating device;
2. the angle of adjusting first acousto-optic frequency shifters makes laser with 2.04 ° of incidents of positive Bragg angle, and change frequency shifter driver module makes laser frequency move to maximum frequency values to the direction that increases; The angle of adjusting second sound optical frequency shifter makes laser with negative 2.34 ° of incidents of Bragg angle, and changes the frequency shifter driver module and make laser frequency move to the minimum frequency value to reducing direction, and the total frequency shifts of laser is 0;
3. the shift frequency numerical value of earlier progressively regulating second sound optical frequency shifter is up to maximum, and the shift frequency numerical value that progressively reduces first acousto-optic frequency shifters more promptly progressively enlarges frequency displacement up to minimum, can obtain a series of frequency shift value f
iAnd keep a record;
4. utilize the laser-Doppler stretcher, the laser spectrum behind the shift frequency is carried out broadening, make the backward scattered spectral shape of laser spectrum and atmospheric molecule identical;
5. utilize signal collection optical fiber to collect the back scattering laser of air molecule in the dopplerbroadening device, and send into the receiving-member of Rayleight windfinding laser radar, corresponding to the 3. each frequency shift value f in step
iObtain the energy ratio R of corresponding two passages
i
6. resulting one group of f and R are the forward calibration result of the Rayleight windfinding laser radar of wind speed;
7. adjust the angle of first acousto-optic frequency shifters, make laser with negative 2.04 ° of incidents of Bragg angle, adjust the angle of second sound optical frequency shifter, make laser with 2.34 ° of incidents of positive Bragg angle, then the laser diffraction level is inferior switches with-1 inter-stage at+1 grade, the shift frequency direction of two acousto-optic frequency shifters all becomes step reverse direction 2., and 4. 5. 6. 3. repeating step, obtain the calibration result of the Rayleight windfinding laser radar of reverse wind speed.
Calibration principle of the present invention is as follows: establish adjustable acousto-optic frequency shifters laser frequency is changed into f
l, corresponding two channel energy ratios are R
l, if in actual wind speed is measured, the energy ratio that also obtains two passages is R
l, then the frequency change that causes of actual wind speed v is f
l, by f
1Can obtain the size of wind speed with the corresponding relation of v, in the actual calibration process, can be with shoot laser a frequency range internal modulation, obtain one group of f wind speed v corresponding different respectively with the R value, therefore the energy ratio R of two passages of corresponding any actual measurement all can obtain corresponding f in measuring wind speed, obtains corresponding air speed v by f again.Because the tuning range of the adjustable acousto-optic frequency shifters of single frequency is 0 point only all, because in the acoustooptic modulation, frequency of sound wave can not be 0, and adjustable extent is less, the BREATHABLE BANDWIDTH of the adjustable acousto-optic frequency shifters of for example French AA company is 60MHz, therefore the present invention uses two frequency adjustable acousto-optic frequency shifters oppositely to be connected in series, and two acousto-optic frequency shifters are modulated laser frequency respectively to the high and low frequency direction, after laser passes through two acousto-optic frequency shifters, frequency cross 0 adjustable, select the centre frequency of two acousto-optic frequency shifters suitably, the adjustable extent that can make laser frequency is the twice of single frequency shifter.Still be equal to the preceding laser spectrum width of shift frequency through the laser spectrum width after the acousto-optic frequency shifters, with on the backward scattered spectral shape of atmospheric molecule very big difference is arranged, therefore, must carry out broadening to its spectrum could be complementary with the receiving-member of laser radar, the present invention uses the Doppler of laser spectrum to widen relation with temperature, and the back scattering of consideration air, design Doppler and widened device.
The above-mentioned calibration process very big advantage of comparing with the calibration process of CNRS at first, is demarcated the error that the laser spectrum drift brings when having eliminated 0 wind speed to greatest extent to system before each measuring wind speed; Secondly, do not use the concrete parameter of interferometer in the whole calibrating procedure, avoided the use of interferometer theory and atmospheric scattering theory, simplified the system calibrating process; Once more, whole calibrating procedure only relates to the adjusting of acousto-optic frequency shifters frequency, can make things convenient for calibration system rapidly, is easy to real-time system and demarcates.
The advantage that the present invention compared with prior art has is:
(1) the present invention can demarcate the error that the laser spectrum drift brings when having eliminated 0 wind speed to greatest extent, the accuracy that improves measuring wind speed to Rayleight windfinding laser radar before each measuring wind speed.
(2) demarcate the accuracy height, the corresponding frequency displacement of the wind speed of the anemometry laser radar 1m/s of 355nm is 5.6MHz, and the acousto-optic frequency shifters driver module has very high accuracy, and frequency error is less than 20KHz, and corresponding wind speed can be ignored; The state of interferometer was identical when the duty of calibration process interferometer was surveyed wind with reality, not because changed and the error of introducing by the interferometer parameter.
(3) calibration process is accurately simulated the influence of wind speed to system, and the receiving-member that is about to Rayleight windfinding laser radar is used as Black-Box, does not need to understand its detail parameters, reduces the optics requirement to two Fabry-Perot.
(4) Rayleight windfinding laser radar is demarcated rapidly, the receiving-member of caliberating device and Rayleight windfinding laser radar is on same optical table, timing signal only needs reflective mirror is inserted in the laser radar light path, regulate the frequency numerical value that frequency shifter is placed angle and regulated driver module, promptly can finish the demarcation of Rayleight windfinding laser radar in the short time.
(5) principle is simple, is easy to realize.
Description of drawings
Fig. 1 is Rayleight windfinding laser radar caliberating device of the present invention and the basic structure block diagram in Rayleight windfinding laser radar is demarcated thereof.
Fig. 2 is the spectrum synoptic diagram of Rayleight windfinding laser radar caliberating device of the present invention.
Fig. 3 is the structural representation of dopplerbroadening device of the present invention.
Fig. 4 is the structured flowchart of radar receiving-member 9.
Among the figure: the laser spectrum after the laser spectrum after 1-laser instrument, 2-first catoptron, 3-attenuator, 4-second catoptron, 5-first acousto-optic frequency shifters, 6-second sound optical frequency shifter, 8-signal collection optical fiber, 10-laser emitting laser spectrum, the 11-frequency displacement left, laser spectrum, 13-Doppler after the 12-frequency displacement to the right widen.
7-dopplerbroadening device, 71-rear end face, 72-laser are gone into perforation, 73-zone of heating, 74-heat insulation layer, 75-front end face, 76-Switching Power Supply, 77-temperature controller, 8-and are collected optical fiber.
9-radar receiving-member, 91-narrow band filter slice, the two Fabry-Perot interferometers of 92-, 93-first photomultiplier, 94-second photomultiplier, 95-data processing module.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, as seen from the figure, Rayleight windfinding laser radar caliberating device of the present invention, comprise a laser instrument 1, laser output light path along this laser instrument 1 is made up of first catoptron 2, attenuator 3, second catoptron 4, first acousto-optic frequency shifters 5, second sound optical frequency shifter 6 and dopplerbroadening device 7 successively, and the output terminal of described dopplerbroadening device 7 joins by the receiving-member 9 of signal collection optical fiber 8 with Rayleight windfinding laser radar.
Described laser instrument 1 is that an optical maser wavelength is the laser instrument of 355nm.
The centre frequency of described first acousto-optic frequency shifters 5 is 400MHz, and the frequency adjustable scope is 400 ± 30MHz, and its Bragg angle is 2.04 °; The centre frequency of described second sound optical frequency shifter 6 is 460MHz, and the frequency adjustable scope is 460 ± 30MHz, and its Bragg angle is 2.34 °.
Described dopplerbroadening device 7 is the cylindrical container of an inwall blacking, as shown in Figure 3, its front end face 75 complete closed, rear end face 71 has the aperture 72 for laser incident and 8 insertions of signal collection optical fiber, the periphery from-inner-to-outer of this cylindrical container is coated with heating lamella 73 and heat insulation layer 74, described zone of heating 73 links to each other with a Switching Power Supply 76, and this Switching Power Supply 76 links to each other with a temperature controller 77 and works under the control of this temperature controller 77.The temperature of these dopplerbroadening device 7 internal gas is controlled at ± 0.1 ℃ fluctuating scope in.
Utilize above-mentioned Rayleight windfinding laser radar caliberating device to carry out the scaling method of Rayleight windfinding laser radar, it is characterized in that this method comprises the following steps:
1. first catoptron 2 and second catoptron 4 are inserted in the light path, the laser that laser instrument 1 is sent imports the Rayleight windfinding laser radar caliberating device;
2. the angle of adjusting first acousto-optic frequency shifters 5 makes laser with 2.04 ° of incidents of positive Bragg angle, and change frequency shifter driver module makes laser frequency move to maximum frequency values to the direction that increases; The angle of adjusting second sound optical frequency shifter 6 makes laser with negative 2.34 ° of incidents of Bragg angle, and changes the frequency shifter driver module and make laser frequency move to the minimum frequency value to reducing direction, and the total frequency shifts of laser is 0;
3. the shift frequency numerical value of earlier progressively regulating second sound optical frequency shifter 6 is up to maximum, and the shift frequency numerical value that progressively reduces first acousto-optic frequency shifters 5 more promptly progressively enlarges frequency displacement up to minimum, obtains a series of frequency shift value f
iAnd keep a record;
4. utilize laser-Doppler stretcher 7, the laser spectrum behind the shift frequency is carried out broadening, make the backward scattered spectral shape of laser spectrum and atmospheric molecule identical;
5. utilize signal collection optical fiber 8 to collect the back scattering laser of air molecule in the dopplerbroadening devices 7, and send into the receiving-member 9 of Rayleight windfinding laser radar, corresponding to the 3. each frequency shift value f in step
iObtain the energy ratio Ri of corresponding two passages;
The f of 6. resulting one group of correspondence and R are the forward calibration result of the Rayleight windfinding laser radar of wind speed;
7. adjust the angle of first acousto-optic frequency shifters 5, make laser with negative 2.04 ° of incidents of Bragg angle, adjust the angle of second sound optical frequency shifter 6, make laser with 2.34 ° of incidents of positive Bragg angle, then the laser diffraction level is inferior switches with-1 inter-stage at+1 grade, the shift frequency direction of two acousto-optic frequency shifters all becomes step reverse direction 2., and 4. 5. 6. 3. repeating step, obtain the calibration result of the Rayleight windfinding laser radar of reverse wind speed.
Claims (7)
1, a kind of caliberating device that is applicable to Rayleight windfinding laser radar, it is characterized in that this system comprises a laser instrument (1), laser output light path along this laser instrument (1) is made up of attenuator (3), first acousto-optic frequency shifters (5), second sound optical frequency shifter (6) and dopplerbroadening device (7) successively, and the output terminal of described dopplerbroadening device (7) joins by the receiving-member (9) of signal collection optical fiber (8) with Rayleight windfinding laser radar.
2, Rayleight windfinding laser radar caliberating device according to claim 1 is characterized in that also being inserted with in the front and back of described attenuator (3) first catoptron (2) and second catoptron (4).
3, Rayleight windfinding laser radar caliberating device according to claim 1 is characterized in that described laser instrument (1) is that an optical maser wavelength is the laser instrument of 355nm.
4, Rayleight windfinding laser radar caliberating device according to claim 1, the centre frequency that it is characterized in that described first acousto-optic frequency shifters (5) is 400MHz, and the frequency adjustable scope is 400 ± 30MHz, and its Bragg angle is 2.04 °; The centre frequency of described second sound optical frequency shifter (6) is 460MHz, and the frequency adjustable scope is 460 ± 30MHz, and its Bragg angle is 2.34 °.
5, Rayleight windfinding laser radar caliberating device according to claim 1, it is characterized in that described dopplerbroadening device (7) is the cylindrical container of an inwall blacking, its front end face (75) complete closed, rear end face (71) has the aperture (72) for laser incident and signal collection optical fiber (8) insertion, the periphery from-inner-to-outer of this cylindrical container is coated with zone of heating (73) and heat insulation layer (74), described zone of heating (73) links to each other with a Switching Power Supply (76), and this Switching Power Supply (76) links to each other with a temperature controller (77) and work under the control of this temperature controller (77).
6, Rayleight windfinding laser radar caliberating device according to claim 1, it is characterized in that the temperature of described dopplerbroadening device (7) internal gas is controlled at ± 0.1 ℃ fluctuating scope in.
7, a kind ofly utilize described Rayleight windfinding laser radar caliberating device to carry out the scaling method of Rayleight windfinding laser radar, it is characterized in that this method comprises the following steps:
1. first catoptron (2) and second catoptron (4) are inserted in the light path, the laser that laser instrument (1) is sent imports the laser radar caliberating device;
2. the angle of adjusting first acousto-optic frequency shifters (5) makes laser with 2.04 ° of incidents of positive Bragg angle, and change frequency shifter driver module makes laser frequency move to maximum frequency values to the direction that increases; The angle of adjusting second sound optical frequency shifter (6) makes laser with negative 2.34 ° of incidents of Bragg angle, and changes the frequency shifter driver module and make laser frequency move to the minimum frequency value to reducing direction, and the total frequency shifts of laser is 0;
3. the shift frequency numerical value of earlier progressively regulating second sound optical frequency shifter (6) is up to maximum, and the shift frequency numerical value that progressively reduces first acousto-optic frequency shifters (5) more promptly progressively enlarges frequency displacement up to minimum, obtains a series of frequency shift value f
iAnd keep a record;
4. utilize laser-Doppler stretcher (7), the laser spectrum behind the shift frequency is carried out broadening, make the backward scattered spectral shape of laser spectrum and atmospheric molecule identical;
5. utilize signal collection optical fiber (8) to collect the back scattering laser of air molecule in the dopplerbroadening device (7), and send into the receiving-member (9) of Rayleight windfinding laser radar, corresponding to the 3. each frequency shift value f in step
iObtain the energy ratio R of corresponding two passages
i
The f of 6. resulting one group of correspondence and R are the forward calibration result of the Rayleight windfinding laser radar of wind speed;
7. adjust the angle of first acousto-optic frequency shifters (5), make laser with negative 2.04 ° of incidents of Bragg angle, adjust the angle of second sound optical frequency shifter (6), make laser with 2.34 ° of incidents of positive Bragg angle, then the laser diffraction level is inferior switches with-1 inter-stage at+1 grade, the shift frequency direction of two acousto-optic frequency shifters all becomes step reverse direction 2., and 4. 5. 6. 3. repeating step, obtain the calibration result of the Rayleight windfinding laser radar of reverse wind speed.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833089A (en) * | 2010-04-30 | 2010-09-15 | 西安理工大学 | Doppler anemometry laser radar sensitivity calibrating system and method |
| CN102288972A (en) * | 2011-05-10 | 2011-12-21 | 中国海洋大学 | Three-wavelength real-time scaling laser radar device |
| CN102608613A (en) * | 2012-03-20 | 2012-07-25 | 西安理工大学 | Device and method for accurately calibrating point object detectivity of laser radar |
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