CN105824018A - System and method for laser speed measurement based on non-injection laser and Etalon - Google Patents
System and method for laser speed measurement based on non-injection laser and Etalon Download PDFInfo
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- CN105824018A CN105824018A CN201610314379.2A CN201610314379A CN105824018A CN 105824018 A CN105824018 A CN 105824018A CN 201610314379 A CN201610314379 A CN 201610314379A CN 105824018 A CN105824018 A CN 105824018A
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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
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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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
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/50—Systems of measurement based on relative movement of target
- G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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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
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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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
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- Electromagnetism (AREA)
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- Aviation & Aerospace Engineering (AREA)
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Abstract
The invention discloses a system and method for laser speed measurement based on a non-injection laser and an Etalon. Based on light-transmission spectral features of the Etalon, wideband non-injection laser pulses are made to pass the Etalon; a series of narrow-band laser independent at frequencies is generated; and the narrow-band laser is sent out by an optical transmitting system. The laser speed measurement system receives back-scattering echoes of a to-be-tested object; after collimation, a polarization optical system is used to make back-scattering light enter the Etalon again at a certain incidence angle. Photomultipliers are disposed on the front face and the rear face of the Etalon respectively, wherein the photomultipliers are called as a reference channel and a signal channel respectively; a ratio between the two channels is in direct proportion to a speed of the to-be-tested object; and the motion speed of the to-be-tested object can be acquired based on an actually measured ratio between the two channels in combination with a calibration result of the speed measurement system. In comparison with existing systems, the system disclosed by the invention has the advantages of low cost and stable work, etc.
Description
Technical field
The present invention relates to a kind of based on non-implanted laser instrument and the laser velocimeter system of Etalon with method, belong to meteorological technical field.
Background technology
Doppler anemometry laser radar, due to the advantage of its uniqueness, has got growing concern for and has applied.Doppler anemometry laser radar technology is divided from Doppler frequency shift detection means and can be divided into incoherent technique and coherent detection technology at present.Incoherent technique uses high-resolution spectroscopy equipment, such as atom and molecule absorption cell, Fabry-Perot interferometer, utilizes the curve of spectrum that high-resolution spectra equipment is precipitous, the change of laser frequency is converted into the change of the light intensity passed through.Coherent detection technology utilizes optical frequency mixing principle, is mixed with local optical signal by the back scattering optical signal comprising Doppler frequency shift, obtains intermediate-freuqncy signal, this signal carries out Fourier's change and i.e. can obtain Doppler frequency shift.
Either incoherent technique or coherent detection technology, system all uses single-frequency laser.The most frequently used way of currently acquired single-frequency laser is injection seeded.When the principle of injection seeded is to make pulse laser go out light by technological means not from the beginning of spontaneous radiation, but before pulses generation, to the good narrow frequency continuous laser of laser instrument injection way, make pulse laser starting of oscillation on the basis of seed laser, this technology is referred to as injection seeded technology, is referred to as seed laser for the arrowband continuous laser injected.The laser that injection seeded technology makes laser instrument export has the characteristic similar to seed light, has the narrowest live width.Certainly injection seeded laser is a kind of principal and subordinate's laser generation system, and system comprises two complete systems, seed laser and high energy pulse laser, and two systems are the most more complicated, consider further that and need collaborative work, further increase development difficulty.
Therefore, for the seed injection laser of Doppler anemometry laser radar, the always developing obstacle of Doppler lidar technology.In terms of cost, seed injection laser is due to system complex, and its cost is often several times even tens times of non-implanted laser instrument.
Summary of the invention
The technical problem to be solved is to provide a kind of based on non-implanted laser instrument and the laser velocimeter system of Etalon with method, the present invention uses non-implanted laser instrument to combine Etalon to carry out Doppler frequency shift detection, it is possible to for Measuring Object or air wind speed.Compared with traditional laser radar, reduce system complexity, reduce development cost；And, native system transmitting-receiving laser all uses an Etalon so that systematic survey effect has no relations with the change of laser frequency itself, improves the measurement accuracy of system.
The present invention solves above-mentioned technical problem by the following technical solutions:
On the one hand, the present invention provides a kind of based on non-implanted laser instrument with the laser velocimeter system of Etalon, and including launching the non-implanted pulse laser of light source as system, beam expanding lens, polaroid, half-wave plate, Etalon, quarter-wave plate, collimating mirror, transmitting receive mirror, the first to the 3rd completely reflecting mirror, the first to the 3rd polarizing beam splitter mirror PBS, beam splitting chip, the first and second plus lens, the first and second photomultiplier tube PMT and microprocessors；
The laser that non-implanted pulse laser sends is after beam expander expands, and transmission is to the first completely reflecting mirror；Laser after first completely reflecting mirror reflection sequentially passes through polaroid, half-wave plate, a PBS transmission to Etalon again, wherein, thoroughly the shaking of polaroid is oriented parallel to the polarization direction of laser after reflection, adjust the polarization direction of laser after half-wave plate makes to reflect parallel with the polarization direction of a PBS, make laser completely through a PBS；Etalon output laser sequentially pass through the 2nd PBS, the 3rd PBS after transmit to quarter-wave plate, wherein, the 2nd PBS, the 3rd PBS polarization direction parallel with the polarization direction of the laser that Etalon exports；Laser rotates 45 degree through quarter-wave plate rear polarizer direction, then sequentially passes through collimating mirror, launches and receive mirror and be radiated on object under test, and produces rear orientation light；Rear orientation light sequentially passes through transmitting and receives mirror, collimating mirror, quarter-wave plate, the 3rd PBS, the 3rd completely reflecting mirror transmission to beam splitting chip, rear orientation light is divided into two bundles through beam splitting chip, a branch of sequentially passing through the first plus lens and a PMT, another bundle sequentially passes through the second completely reflecting mirror, a PBS, Etalon, the 2nd PBS, the second plus lens and the 2nd PMT；Oneth PMT, the 2nd PMT are connected with microprocessor respectively.
As the further prioritization scheme of the present invention, the operation wavelength of non-implanted pulse laser is 532nm, and beam diameter is 0.5mm, and the angle of divergence is 2.7mrad.
As the further prioritization scheme of the present invention, the multiplying power of beam expanding lens is 20.
As the further prioritization scheme of the present invention, the Free Spectral Range of Etalon is 4GHz, and fineness is 12.
On the other hand, the present invention provides a kind of laser velocimeter method based on non-implanted laser instrument and Etalon, specifically comprises the following steps that
First, use non-implanted pulse laser to launch laser as light source, and by beam expanding lens, laser is expanded；
Secondly, the laser after expanding is reflected by the first completely reflecting mirror so that it is can incide Etalon；
Again, polaroid and half-wave plate are set between the first completely reflecting mirror and Etalon, oneth PBS was set before Etalon, second, third PBS is set after Etalon continuously, wherein, the polarization direction of polaroid is parallel to compress the vertical component of laser with the polarization direction of laser after the first completely reflecting mirror reflection；Adjust the polarization direction of laser after half-wave plate enables the first completely reflecting mirror to reflect parallel with the polarization direction of the three of rear class PBS so that laser is completely by three PBS；
Again, its polarization direction after PBS, is rotated 45 degree by quarter-wave plate through second and the 3rd by the Output of laser of Etalon, then through collimating mirror with launch and receive mirror and be irradiated on object under test generation back reflected laser；
Again, back reflected laser sequentially passes through transmitting and receives mirror, collimating mirror, quarter-wave plate, and the back reflected laser behind quarter-wave plate rotatory polarization direction is by the 3rd PBS；
Again, the 3rd completely reflecting mirror is by by the retroreflection optical transport of the 3rd PBS to beam splitting chip, and rear orientation light is divided into two bundles by beam splitting chip, and wherein, a branch of plus lens that is directly over transmits to a PMT；Another bundle is sequentially passed through a PBS, Etalon, the 2nd PBS, plus lens transmission to the 2nd PMT by after the second completely reflecting mirror reflection；
Again, after the rear orientation light received is converted to first and second signals of telecommunication by a PMT and the 2nd PMT respectively, transmission to microprocessor processes；
Finally, the function between first, second signal of telecommunication and object under test speed that microprocessor obtains according to system calibrating, it is calculated object under test speed and exports.
Further prioritization scheme as the present invention, the method of system calibrating is: choose the Reference of some different known speed respectively as object under test, some groups of first and second signals of telecommunication are obtained after startup system, matching obtains the function between first and second signals of telecommunication and speed, thus completion system is demarcated, and function is deposited in microprocessor.
The present invention uses above technical scheme compared with prior art, has following technical effect that
1) system of the present invention does not use injection seeded laser to carry out tachometric survey, reduces the complexity of velocity-measuring system, reduces cost；
2) present invention uses polarization optical system, makes emission system and reception system use same Etalon, and spectrum spacing depends on system incident angle difference, makes the impact of the velocity-measuring system not frequency jitter of Stimulated Light device, ambient temperature, tests the speed more accurately and reliably.
Accompanying drawing explanation
Fig. 1 is velocity-measuring system schematic diagram.
Fig. 2 is laser emission spectrum and by the emission spectrum after Etalon, and wherein, (a) is emission spectrum and the optical transmission spectra figure of Etalon of laser, and (b) is the spectrogram later by Etalon.
Etalon's through spectrum when Fig. 3 is different incidence angles.
Wherein, M1, M2, M3 are completely reflecting mirror；PBS1, PBS2, PBS3 are polarizing beam splitter mirror；PMT1, PMT2 are photomultiplier tube.
The ratio of photomultiplier tube output amplitude when Fig. 4 is friction speed.
Detailed description of the invention
Below in conjunction with the accompanying drawings and technical scheme is described in further detail by specific embodiment:
In the present embodiment, a kind of based on non-implanted laser instrument with the laser velocimeter system of Etalon, as it is shown in figure 1, include launching the non-implanted pulse laser of light source, beam expanding lens, polaroid, half-wave plate, Etalon, quarter-wave plate, collimating mirror, transmitting reception mirror, the first to the 3rd completely reflecting mirror, the first to the 3rd polarizing beam splitter mirror PBS, beam splitting chip, the first and second plus lens, the first and second photomultiplier tube PMT and microprocessors as system.In the present embodiment, trend according to light path can be divided into emission system and two parts of reflex system, wherein, emission system includes successively that along light path non-implanted pulse laser, beam expanding lens, the first completely reflecting mirror M1, a PBS, Etalon, the 2nd PBS, the 3rd PBS, quarter-wave plate, collimating mirror, transmitting receive mirror；Reflex system includes launching along light path receiving mirror, collimating mirror, quarter-wave plate, the 3rd PBS, the 3rd completely reflecting mirror M3, beam splitting chip successively, two-way it is divided into after beam splitting chip, one tunnel is the first plus lens, a PMT, and another road is the second completely reflecting mirror M2, a PBS, Etalon, the 2nd PBS, the second plus lens, the 2nd PMT.Emission system and the system of reception use same Etalon, and spectrum spacing depends on system incident angle difference, makes the impact of the velocity-measuring system not frequency jitter of Stimulated Light device, ambient temperature, tests the speed more accurately and reliably.
Wherein, launching the non-implanted pulse laser of light source is a 532nm pulse laser, and beam diameter is 0.5mm, and the angle of divergence is 2.7mrad；Beam expanding lens is 20 times of optical systems expanded, and sends the pulse laser (angle of divergence is 0.135mrad) of high collimation, to ensure that Etalon can have the highest spectral resolution after beam-expanding system.
Wherein, polaroid and half-wave plate: rotatory polarization sheet makes it thoroughly shake and is oriented parallel to the polarization direction of laser, can compress the vertical component of laser, obtain the purest polarized light, reduce background noise；Half-wave plate can be used for the polarization direction of rotary laser, the polarization direction making laser is parallel with the polarization direction of follow-up three PBS, thus launch laser and can pass through three PBS and send, and back scattering luminous energy enters respective detectors through three PBS, reach emission system and reception system is used in conjunction with the purpose of Etalon.
Wherein, Etalon: this Etalon Free Spectral Range is 4GHz, fineness is 12, and therefore this Etalon's is 4/12=0.33GHz through spectral width.When the laser in broadband is by Etalon, Etalon plays the effect of light comb, produces the laser of arrowband；Reception system is different from emergent light due to reception light to the incident angle of Etalon, therefore, to the rear orientation light received, its spectrum has a relative movement, according to the marginal technology method in the Doppler's detection method known, utilize this spectroscopic studying can differentiate the size of Doppler frequency shift, and then be calculated the speed of physics to be measured.
Wherein, three PBS constitute polarization light-conducting system, according to the feature of PBS, can pass through parallel polarized light, so the laser launching light source transmitting can pass through three PBS, thus send from emission system；And rear orientation light, owing to polarization direction becomes the laser of vertical polarization through quarter-wave plate, therefore cannot pass through PBS, but be reflected off, simultaneously through the cooperation of two completely reflecting mirrors (M2 and M3), rear orientation light is introduced Etalon by polarization light-conducting system, and the angle of incidence entering Etalon is adjustable, this angle initialization is 1mrad, is used for differentiating Doppler frequency shift；
Wherein, quarter-wave plate, collimating mirror and transmitting receive mirror, and the effect of this part is to launch laser with the form of directional light, receives backscatter signal simultaneously, backscatter signal is collimated, again passing by quarter-wave plate, the effect of quarter-wave plate is that laser passes twice through this wave plate, polarization direction half-twist, so cannot pass through PBS, but by PBS, make polarization light-conducting system come into force, and rear orientation light enters Etalon along polarization light-conducting system.
Wherein, first and second plus lens, the first and second photomultiplier tube PMT constitute detection system, every part includes a plus lens and a photomultiplier tube (PMT), its role is to the two ways of optical signals (reference optical signal and flashlight) after beam splitting chip beam splitting is carried out photoelectric conversion, so that the microprocessor of rear class carries out data process, the velocity information of output object under test.
Based on above-mentioned laser velocimeter method based on non-implanted laser and the laser velocimeter system of Etalon, comprise the following steps:
1) laser pulse launched by 532nm pulse laser, compresses the angle of divergence, guide Etalon through completely reflecting mirror M1 after beam expanding lens, and laser incident angle on Etalon can realize by adjusting M1 so that laser vertical incides on Etalon；
2) rotatory polarization sheet makes light intensity after polaroid maximum, and at this moment thoroughly shaking of polaroid is oriented parallel to launch the polarization direction of laser；
3) rotatable halfwave plate makes the polarization direction launching laser mate with the direction of PBS1, now launches laser and passes through PBS1 completely；
4) transmission laser is irradiated on Etalon, owing to Etalon is through the characteristic of spectrum, causes being divided into several independent peak on frequency from the laser of Etalon other end outgoing.As in figure 2 it is shown, wherein, (a) is emission spectrum and the optical transmission spectra figure of Etalon of laser, and (b) is the spectrogram later by Etalon；
5) laser is by, after Etalon, owing to being parallel to the direction of PBS, therefore, continuing to pass through PBS2, PBS3, rotate 45 degree through quarter-wave plate rear polarizer direction；
6) launch after laser receives mirror by collimating mirror, transmitting and enter in air, be radiated on the aerosol particle thing on object under test or in air；
7) launching laser and the object under test with certain speed interacts, according to Doppler effect principle, rear orientation light carries Doppler shift information；
8) launch the back scattering receiving mirror reception from object under test, and become directional light through collimating mirror；
9) rear orientation light rotates 45 degree through its polarization direction of quarter-wave plate along original direction, makes the polarization direction of rear orientation light be perpendicular to launch the polarization direction of laser；
10) rear orientation light is reflected by PBS3, completely reflecting mirror M2, and rear orientation light is divided into two parts by beam splitting chip, and the rear orientation light of 10%, after plus lens converges, is detected by PMT1；
11) rear orientation light of 90% is angled into Etalon after completely reflecting mirror M3 and PBS1 reflects, and rear orientation light angle of incidence on Etalon can be adjusted by M3；Adjusting M3 angle makes the spectrum of Etalon have a relative movement relative to the spectrum launching laser, produces and is similar to the effect of marginal technology in Doppler lidar, as shown in Figure 3；
12) through Etalon backscatter signal through PBS3 reflect after, then through plus lens converge, detected by PMT2；
13) calculating the ratio of the output valve of PMT1, PMT2, its ratio is relevant with Doppler frequency shift, according to system calibrating result (ratio and the one-to-one relationship of object under test speed), i.e. can obtain the movement velocity of object under test.
Based on above system and detection method and step, we establish this system at laboratory, and the rotating circular disk utilizing speed to adjust measured as object under test, as shown in Figure 4, wherein, abscissa is the rotary speed (cycle per minute clock) of disk to measurement result, radius according to disk and laser incident angle can direct transition lines speed, vertical coordinate is the ratio of two passages, it can be seen that during disk rapid change, and the ratio of the output valve of PMT1, PMT2 there occurs change.Straight line in Fig. 4 is the fitting a straight line measuring point, it can be seen that the ratio of the output valve of PMT1, PMT2 and the rotary speed of rotating circular disk have good linear relationship, and therefore, Laboratory Principle is it is demonstrated experimentally that this laser velocimeter system is feasible.
The above; it is only the detailed description of the invention in the present invention; but protection scope of the present invention is not limited thereto; any it is familiar with the people of this technology in the technical scope that disclosed herein; it is appreciated that the conversion or replacement expected; all should contain within the scope of the comprising of the present invention, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (6)
1. based on non-implanted laser instrument and the laser velocimeter system of Etalon, it is characterized in that, launch the non-implanted pulse laser of light source, beam expanding lens, polaroid, half-wave plate, Etalon, quarter-wave plate, collimating mirror, transmitting reception mirror, the first to the 3rd completely reflecting mirror, the first to the 3rd polarizing beam splitter mirror PBS, beam splitting chip, the first and second plus lens, the first and second photomultiplier tube PMT and microprocessors including as system；
The laser that non-implanted pulse laser sends is after beam expander expands, and transmission is to the first completely reflecting mirror；Laser after first completely reflecting mirror reflection sequentially passes through polaroid, half-wave plate, a PBS transmission to Etalon again, wherein, thoroughly the shaking of polaroid is oriented parallel to the polarization direction of laser after reflection, adjust the polarization direction of laser after half-wave plate makes to reflect parallel with the polarization direction of a PBS, make laser completely through a PBS；Etalon output laser sequentially pass through the 2nd PBS, the 3rd PBS after transmit to quarter-wave plate, wherein, the 2nd PBS, the 3rd PBS polarization direction parallel with the polarization direction of the laser that Etalon exports；Laser rotates 45 degree through quarter-wave plate rear polarizer direction, then sequentially passes through collimating mirror, launches and receive mirror and be radiated on object under test, and produces rear orientation light；Rear orientation light sequentially passes through transmitting and receives mirror, collimating mirror, quarter-wave plate, the 3rd PBS, the 3rd completely reflecting mirror transmission to beam splitting chip, rear orientation light is divided into two bundles through beam splitting chip, a branch of sequentially passing through the first plus lens and a PMT, another bundle sequentially passes through the second completely reflecting mirror, a PBS, Etalon, the 2nd PBS, the second plus lens and the 2nd PMT；Oneth PMT, the 2nd PMT are connected with microprocessor respectively.
The most according to claim 1 based on non-implanted laser instrument with the laser velocimeter system of Etalon, it is characterised in that the operation wavelength of non-implanted pulse laser is 532nm, and beam diameter is 0.5mm, and the angle of divergence is 2.7mrad.
The most according to claim 1 based on non-implanted laser instrument with the laser velocimeter system of Etalon, it is characterised in that the multiplying power of beam expanding lens is 20.
The most according to claim 1 based on non-implanted laser instrument with the laser velocimeter system of Etalon, it is characterised in that the Free Spectral Range of Etalon is 4GHz, and fineness is 12.
5. laser velocimeter method based on non-implanted laser instrument and Etalon, it is characterised in that specifically comprise the following steps that
First, use non-implanted pulse laser to launch laser as light source, and by beam expanding lens, laser is expanded；
Secondly, the laser after expanding is reflected by the first completely reflecting mirror so that it is can incide Etalon；
Again, polaroid and half-wave plate are set between the first completely reflecting mirror and Etalon, oneth PBS was set before Etalon, second, third PBS is set after Etalon continuously, wherein, the polarization direction of polaroid is parallel to compress the vertical component of laser with the polarization direction of laser after the first completely reflecting mirror reflection；Adjust the polarization direction of laser after half-wave plate enables the first completely reflecting mirror to reflect parallel with the polarization direction of the three of rear class PBS so that laser is completely by three PBS；
Again, its polarization direction after PBS, is rotated 45 degree by quarter-wave plate through second and the 3rd by the Output of laser of Etalon, then through collimating mirror with launch and receive mirror and be irradiated on object under test generation back reflected laser；
Again, back reflected laser sequentially passes through transmitting and receives mirror, collimating mirror, quarter-wave plate, and the back reflected laser behind quarter-wave plate rotatory polarization direction is by the 3rd PBS；
Again, the 3rd completely reflecting mirror is by by the retroreflection optical transport of the 3rd PBS to beam splitting chip, and rear orientation light is divided into two bundles by beam splitting chip, and wherein, a branch of plus lens that is directly over transmits to a PMT；Another bundle is sequentially passed through a PBS, Etalon, the 2nd PBS, plus lens transmission to the 2nd PMT by after the second completely reflecting mirror reflection；
Again, after the rear orientation light received is converted to first and second signals of telecommunication by a PMT and the 2nd PMT respectively, transmission to microprocessor processes；
Finally, the function between first, second signal of telecommunication and object under test speed that microprocessor obtains according to system calibrating, it is calculated object under test speed and exports.
Laser velocimeter method based on non-implanted laser instrument and Etalon the most according to claim 5, it is characterized in that, the method of system calibrating is: choose the Reference of some different known speed respectively as object under test, some groups of first, second signals of telecommunication are obtained after startup system, matching obtains the function between first, second signal of telecommunication and speed, thus completion system is demarcated, and function is deposited in microprocessor.
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| 卜令兵 等: "条纹技术测风激光雷达研究", 《光子学报》 * |
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| CN105824018B (en) | 2017-12-05 |
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