CN105824018B - Laser velocimeter system and method based on non-implanted laser and Etalon - Google Patents
Laser velocimeter system and method based on non-implanted laser and Etalon Download PDFInfo
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- CN105824018B CN105824018B CN201610314379.2A CN201610314379A CN105824018B CN 105824018 B CN105824018 B CN 105824018B CN 201610314379 A CN201610314379 A CN 201610314379A CN 105824018 B CN105824018 B CN 105824018B
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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 discloses a kind of laser velocimeter system and method based on non-implanted laser and Etalon, utilize Etalon transmission spectral signature, the non-implanted laser pulse of wideband is allowed to pass through Etalon, a series of laser of narrowband in frequency independence are produced, are sent the laser of narrowband by optical emission system.Laser velocimeter system receives the backscattering echo of target to be measured, it is collimated that rear orientation light is again introduced into Etalon with certain incidence angle using polarization optical system, in Etalon front and back, one photomultiplier is respectively set, it is referred to as reference channel and signalling channel, the ratio of two passages and the speed of target to be measured are proportional, by surveying the ratio of two passages, with reference to the calibration result of velocity-measuring system, the movement velocity of target to be measured can be obtained.The system has that cost is low, steady operation and other merits compared to existing system.
Description
Technical field
The present invention relates to a kind of laser velocimeter system and method based on non-implanted laser and Etalon, belong to meteorological skill
Art field.
Background technology
Doppler anemometry laser radar has been got growing concern for and applied due to its unique advantage at present.
Doppler anemometry laser radar technology is divided from Doppler frequency shift detection means at present can be divided into incoherent technique and be concerned with
Detection Techniques.Incoherent technique uses high-resolution spectroscopy equipment, such as atom and molecule absorption cell, Fabry-Perot interferometer,
Using 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.It is relevant
Detection Techniques utilize optical frequency mixing principle, and the back scattering optical signal comprising Doppler frequency shift is mixed with local optical signal
Frequently, intermediate-freuqncy signal is obtained, Fourier's change is carried out to the signal can obtain Doppler frequency shift.
Either incoherent technique or coherent detection technology, system use single-frequency laser.Currently acquired single-frequency
The most frequently used method of laser is injection seeded.The principle of injection seeded be when making pulse laser light extraction by technological means not
Since spontaneous radiation, but before pulses generation, laser injection way narrow frequency continuous laser well is given, makes pulse laser
Device starting of oscillation on the basis of seed laser, the technology are referred to as injection seeded technology, and the arrowband continuous laser for injection is referred to as kind
Sub- laser.Injection seeded technology causes the laser that laser exports to have the characteristic similar to seed light, has very narrow line
It is wide.Certainly injection seeded laser is a kind of principal and subordinate's laser generation system, and system includes two complete systems, seed laser
Device and high energy pulse laser, two systems are inherently more complicated, and considering further that needs to cooperate, and further increase development difficulty.
Therefore, the seed injection laser for Doppler anemometry laser radar, it is always Doppler lidar technology
A developing obstacle.In terms of cost, for seed injection laser due to system complex, its cost is often non-implanted laser
Even tens times of several times of device.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of laser velocimeter based on non-implanted laser and Etalon
System and method, the present invention carry out Doppler frequency shift detection using non-implanted laser combination Etalon, can be used for measuring
Object or air wind speed.Compared with traditional laser radar, system complexity is reduced, reduces development cost；Moreover, this
System transmitting-receiving laser uses an Etalon so that the change of systematic survey effect and laser frequency has no relations in itself, improves
The measurement accuracy of system.
The present invention uses following technical scheme to solve above-mentioned technical problem：
On the one hand, the present invention provides a kind of laser velocimeter system based on non-implanted laser and Etalon, including conduct
System launches non-implanted pulse laser, beam expanding lens, polarizer, half-wave plate, Etalon, quarter-wave plate, the collimation of light source
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, first and second converge
Poly- lens, the first and second photomultiplier PMT and microprocessor；
The laser that non-implanted pulse laser is sent is transmitted to the first completely reflecting mirror after beam expander expands；First is complete
Laser after speculum reflection is transmitted to Etalon by polarizer, half-wave plate, the first PBS successively again, wherein, polarizer it is saturating
Shake and be oriented parallel to the polarization direction of laser after reflection, adjustment half-wave plate causes polarization direction and the first PBS of laser after reflection
Polarization direction it is parallel, make laser completely through the first PBS；The laser of Etalon outputs passes through the 2nd PBS, the 3rd PBS successively
After transmit to quarter-wave plate, wherein, the 2nd PBS, the 3rd PBS polarization direction and Etalon output laser polarization side
To parallel；Laser rotates 45 degree through quarter-wave plate rear polarizer direction, then is radiated at successively by collimating mirror, transmitting receive mirror
On object under test, and produce rear orientation light；Rear orientation light successively by transmitting receive mirror, collimating mirror, quarter-wave plate,
3rd PBS, the 3rd completely reflecting mirror are transmitted to beam splitting chip, and rear orientation light is divided into two beams through beam splitting chip, a branch of to pass through first successively
Plus lens and the first PMT, another Shu Yici is by the second completely reflecting mirror, the first PBS, Etalon, the 2nd PBS, the second convergence
Lens and the 2nd PMT；First 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, beam diameter
For 0.5mm, angle of divergence 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, Etalon Free Spectral Range is 4GHz, fineness 12.
On the other hand, the present invention provides a kind of laser velocimeter method based on non-implanted laser and Etalon, specific step
It is rapid as follows：
First, laser is launched as light source using non-implanted pulse laser, and laser expanded by beam expanding lens；
Secondly, the first completely reflecting mirror is reflected the laser after expanding, and can incide Etalon；
Again, polarizer and half-wave plate are set between the first completely reflecting mirror and Etalon, the is set before Etalon
One PBS, second, third PBS is continuously set after Etalon, wherein, the polarization direction of polarizer and the first completely reflecting mirror are anti-
The polarization direction for penetrating rear laser is parallel to compress the vertical component of laser；Adjustment half-wave plate makes laser after the reflection of the first completely reflecting mirror
Polarization direction it is parallel with three PBS of rear class polarization direction so that laser can pass through three PBS completely；
Again, Etalon output laser is by second and the 3rd after PBS, by quarter-wave plate by its polarization direction
45 degree of rotation, then be irradiated on object under test by collimating mirror and transmitting receive mirror and produce back reflected laser；
Again, back reflected laser is successively by transmitting receive mirror, collimating mirror, quarter-wave plate, through quarter-wave plate
Back reflected laser behind rotatory polarization direction is by the 3rd PBS；
Again, the 3rd completely reflecting mirror will incite somebody to action backward by the retroreflection optical transport of the 3rd PBS to beam splitting chip, beam splitting chip
Scattering light is divided into two beams, wherein, a branch of plus lens that is directly over is transmitted to the first PMT；Another beam is anti-by the second completely reflecting mirror
Transmitted successively by the first PBS, Etalon, the 2nd PBS, plus lens to the 2nd PMT after penetrating；
Again, the rear orientation light received is converted to the first and second electric signals by the first PMT and the 2nd PMT respectively
Afterwards, transmit to microprocessor and handled；
Finally, the letter between microprocessor obtains according to system calibrating first, second electric signal and object under test speed
Number, is calculated object under test speed and exports.
As the further prioritization scheme of the present invention, the method for system calibrating is：Choose the ginseng of some different known speeds
Object is examined respectively as object under test, obtains some groups of the first and second electric signals after activation system, fitting obtains first and the
Function between two electric signals and speed, so as to complete system calibrating, and function is deposited in into microprocessor.
The present invention compared with prior art, has following technique effect using above technical scheme：
1）The system of the present invention carries out tachometric survey without using injection seeded laser, reduces the complexity of velocity-measuring system,
Reduce cost；
2）The present invention uses polarization optical system, makes emission system and reception system uses same Etalon, between spectrum
Away from depending on system incident angle difference, make the velocity-measuring system not frequency jitter of stimulated light device, the influence of ambient temperature, test the speed more
Accurately and reliably.
Brief description of the drawings
Fig. 1 is velocity-measuring system schematic diagram.
Fig. 2 is laser emission spectrum and by the emission spectrum after Etalon, wherein,（a）For laser emission spectrum and
Etalon optical transmission spectra figure,（b）To pass through spectrogram later Etalon.
Etalon's passes 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 photoelectricity times
Increase pipe.
The ratio between photomultiplier output amplitude when Fig. 4 is friction speed.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to technical scheme：
In the present embodiment, a kind of laser velocimeter system based on non-implanted laser and Etalon, as shown in figure 1, including
As the system transmitting non-implanted pulse laser of light source, beam expanding lens, polarizer, 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, first and the
Two plus lens, the first and second photomultiplier PMT and microprocessor.In the present embodiment, it can be divided into according to the trend of light path
Two parts of emission system and reflecting system, wherein, emission system includes non-implanted pulse laser along light path, expanded successively
Mirror, the first completely reflecting mirror M1, the first PBS, Etalon, the 2nd PBS, the 3rd PBS, quarter-wave plate, collimating mirror, transmitting receive
Mirror；Reflecting system includes transmitting receive mirror, collimating mirror, quarter-wave plate, the 3rd PBS, the 3rd completely reflecting mirror along light path successively
M3, beam splitting chip, be divided into two-way after beam splitting chip, be all the way the first plus lens, the first PMT, another way be the second completely reflecting mirror M2,
First PBS, Etalon, the 2nd PBS, the second plus lens, the 2nd PMT.Emission system and reception system use same
Etalon, spectrum spacing depend on system incident angle difference, makes the velocity-measuring system not frequency jitter of stimulated light device, ambient temperature
Influence, test the speed more accurately and reliably.
Wherein, the transmitting non-implanted pulse laser of light source is a 532nm pulse laser, beam diameter 0.5mm, is sent out
It is 2.7mrad to dissipate angle；Beam expanding lens is 20 times of optical systems expanded, and the pulse that high collimation is sent after beam-expanding system swashs
Light（The angle of divergence is 0.135mrad）, to ensure that Etalon can have very high spectral resolution.
Wherein, polarizer and half-wave plate：Rotatory polarization piece makes it shake thoroughly to be oriented parallel to the polarization direction of laser, can press
The vertical component of contracting laser, more pure polarised light is obtained, reduce ambient noise；Half-wave plate can be used for the polarization of rotary laser
Direction, make the polarization direction of laser parallel with the polarization direction of three follow-up PBS, three can be passed through so as to launch laser
PBS is sent, and back scattering luminous energy enters respective detector by three PBS, reaches emission system and reception system is total to
With the purpose for using Etalon.
Wherein, Etalon：The Etalon Free Spectral Ranges are 4GHz, fineness 12, therefore the transmission of the Etalon
Spectral width is 4/12=0.33GHz.When the laser in broadband passes through Etalon, Etalon plays a part of light comb, produces arrowband
Laser；Emergent light is different to Etalon incident angle due to receiving light in reception system, it is therefore, backward scattered to what is received
Light is penetrated, its spectrum has a relative movement, according to the marginal technology method in well known Doppler's detection method, utilizes the spectrum
Movement can differentiate the size of Doppler frequency shift, and then the speed of physics to be measured is calculated.
Wherein, three PBS form polarization light-conducting system, according to the characteristics of PBS, can pass through parallel polarized light, so hair
Three PBS can be passed through by penetrating the laser of light source transmitting, so as to be sent from emission system；And rear orientation light, due to polarization
Direction becomes the laser of vertical polarization through quarter-wave plate, therefore cannot pass through PBS, but is reflected off, and passes through simultaneously
Two completely reflecting mirrors（M2 and M3）Cooperation, rear orientation light introduces Etalon, and enters Etalon by polarization light-conducting system
Incidence angle it is adjustable, the angle initialization is 1mrad, for differentiating Doppler frequency shift；
Wherein, quarter-wave plate, collimating mirror and transmitting receive mirror, the effect of the part are laser with directional light
Form is launched, while receives backscatter signal, and backscatter signal is collimated, again passes by quarter-wave plate,
The effect of quarter-wave plate is that laser passes twice through the wave plate, and polarization direction is rotated by 90 °, so PBS is cannot pass through, but
By PBS, polarization light-conducting system is set to come into force, and rear orientation light enters Etalon along polarization light-conducting system.
Wherein, the first and second plus lens, the first and second photomultiplier PMT form detection system, are wrapped per part
Include a plus lens and a photomultiplier（PMT）, its role is to the two ways of optical signals after beam splitting chip beam splitting（With reference to
Optical signal and flashlight）Photoelectric conversion is carried out, data processing is carried out so as to the microprocessor of rear class, exports the speed of object under test
Information.
Based on the laser velocimeter method of the above-mentioned laser velocimeter system based on non-implanted laser and Etalon, including following step
Suddenly：
1) 532nm pulse lasers transmitting laser pulse, compresses the angle of divergence after beam expanding lens, is oriented to through completely reflecting mirror M1
Etalon, incident angle of the laser on Etalon can be realized by adjusting M1 so that laser vertical incides Etalon
On；
2) rotatory polarization piece make it that light intensity is maximum behind polarizer, and at this moment shaking thoroughly for polarizer is oriented parallel to launch laser
Polarization direction；
3) polarization direction that rotatable halfwave plate to launch laser matches with PBS1 direction, and it is completely logical now to launch laser
Cross PBS1；
4) transmission laser is irradiated on Etalon, because Etalon passes through the characteristic of spectrum, is caused from the Etalon other ends
The laser of outgoing is divided into several independent peaks in frequency.As shown in Fig. 2 wherein,（a）Be laser emission spectrum and
Etalon optical transmission spectra figure,（b）It is by spectrogram later Etalon；
5) after laser is by Etalon, due to the direction parallel to PBS, therefore, PBS2, PBS3 are continued to pass through, through four points
One of wave plate rear polarizer direction rotate 45 degree；
6) launch laser by entering after collimating mirror, transmitting receive mirror in air, be radiated on object under test or in air
Aerosol particle thing on；
7) launch laser to interact with the object under test with certain speed, it is backward to dissipate according to Doppler effect principle
Penetrate light and carry Doppler shift information；
8) launch receive mirror and receive the back scattering from object under test, and be changed into directional light by collimating mirror；
9) rear orientation light rotates 45 degree by its polarization direction of quarter-wave plate along original direction, makes backward dissipate
The polarization direction of light is penetrated perpendicular to the polarization direction of transmitting 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, 10%
Rear orientation light is detected after plus lens converges by PMT1；
11) 90% rear orientation light is angled into Etalon after completely reflecting mirror M3 and PBS1 reflection, backward to dissipate
Penetrating incidence angle of the light on Etalon can be adjusted by M3；Adjustment M3 angles make Etalon spectrum relative to transmitting laser
Spectrum has a relative movement, produces the effect for being similar to marginal technology in Doppler lidar, as shown in Figure 3；
12) converge after PBS3 reflects, then through plus lens by Etalon backscatter signal, detected by PMT2；
13）The ratio of PMT1, PMT2 output valve is calculated, its ratio is relevant with Doppler frequency shift, according to system calibrating knot
Fruit（Ratio and the one-to-one relationship of object under test speed）, you can to obtain the movement velocity of object under test.
System and detection method and step based on more than, we establish the system in laboratory, and can using speed
Measured using the rotating circular disk of tune as object under test, measurement result is as shown in figure 4, wherein, abscissa is the rotation of disk
Rotary speed (cycle per minute clock), linear velocity can directly be converted according to the radius of disk and laser incident angle, ordinate is two passages
Ratio, it can be seen that disk speed change when, the ratio of PMT1, PMT2 output valve is changed.Straight line in Fig. 4 is
The fitting a straight line of measurement point, it can be seen that the ratio of PMT1, PMT2 output valve and the rotary speed of rotating circular disk have very well
Linear relationship, therefore, Laboratory Principle is it is demonstrated experimentally that the laser velocimeter system is feasible.
It is described above, it is only the embodiment in the present invention, but protection scope of the present invention is not limited thereto, and is appointed
What be familiar with the people of the technology disclosed herein technical scope in, it will be appreciated that the conversion or replacement expected, should all cover
Within the scope of the present invention, therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (5)
1. the laser velocimeter system based on non-implanted laser and Etalon, it is characterised in that including launching light source as system
Non-implanted pulse laser, beam expanding lens, polarizer, 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, first
With the second photomultiplier PMT and microprocessor；
The laser that non-implanted pulse laser is sent is transmitted to the first completely reflecting mirror after beam expander expands；First total reflection
Laser after mirror reflection is transmitted to Etalon by polarizer, half-wave plate, the first PBS successively again, wherein, the saturating side of shaking of polarizer
To the polarization direction of laser after parallel to reflection, adjustment half-wave plate causes the inclined of the polarization direction of laser and the first PBS after reflection
The direction that shakes is parallel, makes laser completely through the first PBS；The laser of Etalon outputs passes after the 2nd PBS, the 3rd PBS successively
Quarter-wave plate is transported to, wherein, the 2nd PBS, the 3rd PBS polarization direction and the polarization direction of the Etalon laser exported are put down
OK；Laser rotates 45 degree through quarter-wave plate rear polarizer direction, then is radiated at successively by collimating mirror, transmitting receive mirror to be measured
On object, and produce rear orientation light；Rear orientation light is successively by transmitting receive mirror, collimating mirror, quarter-wave plate, the 3rd
PBS, the 3rd completely reflecting mirror are transmitted to beam splitting chip, and rear orientation light is divided into two beams through beam splitting chip, a branch of successively by the first convergence
Lens and the first PMT, another Shu Yici is by the second completely reflecting mirror, the first PBS, Etalon, the 2nd PBS, the second plus lens
With the 2nd PMT；First PMT, the 2nd PMT are connected with microprocessor respectively；
The operation wavelength of non-implanted pulse laser is 532nm, beam diameter 0.5mm, angle of divergence 2.7mrad.
2. the laser velocimeter system according to claim 1 based on non-implanted laser and Etalon, it is characterised in that expand
Shu Jing multiplying power is 20.
3. the laser velocimeter system according to claim 1 based on non-implanted laser and Etalon, it is characterised in that
Etalon Free Spectral Range is 4GHz, fineness 12.
4. the laser velocimeter method based on non-implanted laser and Etalon, it is characterised in that comprise the following steps that：
First, laser is launched as light source using non-implanted pulse laser, and laser expanded by beam expanding lens；
Secondly, the first completely reflecting mirror is reflected the laser after expanding, and can incide Etalon；
Again, polarizer and half-wave plate are set between the first completely reflecting mirror and Etalon, first is set before Etalon
PBS, second, third PBS is continuously set after Etalon, wherein, the polarization direction of polarizer is reflected with the first completely reflecting mirror
The polarization direction of laser is parallel to compress the vertical component of laser afterwards；Adjustment half-wave plate make first completely reflecting mirror reflect after laser
Polarization direction is parallel with three PBS of rear class polarization direction so that laser can pass through three PBS completely；
Again, Etalon output laser after PBS, is rotated its polarization direction by quarter-wave plate by second and the 3rd
45 degree, then be irradiated on object under test by collimating mirror and transmitting receive mirror and produce back reflected laser；
Again, back reflected laser rotates successively by transmitting receive mirror, collimating mirror, quarter-wave plate through quarter-wave plate
Back reflected laser behind 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 beam splitting chip is by back scattering
Light is divided into two beams, wherein, a branch of plus lens that is directly over is transmitted to the first PMT；After another beam is reflected by the second completely reflecting mirror
Transmitted successively by the first PBS, Etalon, the 2nd PBS, plus lens to the 2nd PMT；
Again, after the rear orientation light received is converted to the first and second electric signals by the first PMT and the 2nd PMT respectively, pass
Microprocessor is transported to be handled；
Finally, the function between microprocessor obtains according to system calibrating first, second electric signal and object under test speed, meter
Calculation obtains object under test speed and exported.
5. the laser velocimeter method according to claim 4 based on non-implanted laser and Etalon, it is characterised in that be
System demarcation method be：The References of some different known speeds is chosen respectively as object under test, is obtained after activation system
Some groups of first, second electric signals, fitting obtains the function between first, second electric signal and speed, so as to complete system mark
It is fixed, and function is deposited in into microprocessor.
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