CN108761485A - Fabry-Perot interferometer, interference device and Doppler anemometry laser radar - Google Patents
Fabry-Perot interferometer, interference device and Doppler anemometry laser radar Download PDFInfo
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- CN108761485A CN108761485A CN201810487878.0A CN201810487878A CN108761485A CN 108761485 A CN108761485 A CN 108761485A CN 201810487878 A CN201810487878 A CN 201810487878A CN 108761485 A CN108761485 A CN 108761485A
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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
Abstract
The invention discloses a kind of Fabry-Perot interferometer, interference device and Doppler anemometry laser radar, which includes：The first transparent substrates and the second transparent substrates being oppositely arranged；There are two optical channels for the Fabry-Perot interferometer tool；Wherein, freely compose the spacing 1/n equal to Doppler frequency shift caused by satellite flight, n of the Fabry-Perot interferometer are the positive integer more than 1；The centre frequency interval in two channels is equal to the half for freely composing spacing in the Fabry-Perot interferometer.The Fabry-Perot interferometer is simple in structure, high certainty of measurement, is convenient for engineer application, avoids the problem of appearance outgoing light frequency can not lock.There is higher measurement accuracy and reliability using the Doppler anemometry laser radar of the Fabry-Perot interferometer.
Description
Technical field
The present invention relates to optical element technology fields, more specifically, being related to a kind of Fabry-Perot interferometer, interference
Device and Doppler anemometry laser radar.
Background technology
Doppler anemometry laser radar can provide dimensional wind information with its high-resolution, high-precision, big investigative range
Ability has important application in terms of climatic study and weather forecast, causes the concern that the world is multinational, and has put into a large amount of
Human and material resources are studied.According to detection mode difference, Doppler anemometry laser radar technology can be divided into coherent technique and non-phase
Dry (direct detection) technology.Wherein direct technology is to utilize transmitance of the atmospheric molecule backscattering echo signal after frequency discriminator
Height carrys out inverting and obtains wind speed, can be used for detecting troposphere and stratospheric atmospheric wind.
Core component of the Fabry-Perot interferometer as Direct-Detection Doppler Wind Lidar, performance it is good
The bad accuracy for directly affecting measurement result, existing Fabry-Perot interferometer technology mainly have single channel and binary channels
(or two-sided matching), wherein two-channel method Fabry-Perot interferometer are because with higher measurement accuracy and as current
The anemometry laser radar master technology to be used of research and development, however the structure type of interferometer and parameter selection can all directly affect survey
The precision and the convenience degree in engineer application of amount, the at present Fabry-Perot used in Doppler anemometry laser radar
Easily there is the problems such as outgoing light frequency can not lock there are engineer application difficulty is big in interferometer.
Invention content
To solve the above-mentioned problems, technical solution of the present invention provide a kind of Fabry-Perot interferometer, interference device and
Doppler anemometry laser radar, the Fabry-Perot interferometer is simple in structure, high certainty of measurement, is convenient for engineer application, avoids
There is the problem of outgoing light frequency can not lock.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of Fabry-Perot interferometer is used for the Doppler anemometry laser radar of Seeds of First Post-flight, the Fabry-Perot
Luo Gan's interferometer includes：
The first transparent substrates and the second transparent substrates being oppositely arranged；
There are two optical channels for the Fabry-Perot interferometer tool；
Wherein, the spacing of freely composing of the Fabry-Perot interferometer is equal to Doppler frequency shift caused by satellite flight
1/n, n are the positive integer more than 1；In the Fabry-Perot interferometer centre frequency interval in two channels be equal to it is described from
By the half of spectrum spacing.
Preferably, in above-mentioned Fabry-Perot interferometer, first transparent substrates and second transparent substrates it
Between there is transparent filler medium, the transmitance of the transparent filler medium to be more than 99%, coefficient of thermal expansion is less than 0.5/MK.
Preferably, in above-mentioned Fabry-Perot interferometer, the transparent filler medium is devitrified glass.
Preferably, in above-mentioned Fabry-Perot interferometer, the Fabry-Perot interferometer freely composes spacing etc.
It is equal to 5.475GHz in the centre frequency interval of 10.95GHz, two channels, the halfwidth of transmittance curve is equal to 1.56GHz.
The present invention also provides a kind of interference device, the interference device includes：
Quarter wave plate, the quarter wave plate have opposite the first face and the second face；
Polarization splitting prism group, the polarization splitting prism group are oppositely arranged with first face；
Twin-channel Fabry-Perot interferometer, the Fabry-Perot interferometer are oppositely arranged with second face；
Wherein, the Fabry-Perot interferometer is into claim 1-4 any one of them Fabry-Perot interferences
Instrument.
Preferably, in above-mentioned interference device, there are three identical isosceles right-angle prismatics for the polarization splitting prism group tool
Mirror, there are one bevel edge side and two identical straight flange sides for the isosceles right angle prism tool；
Three isosceles right angle prisms are followed successively by the first isosceles right angle prism, the second isosceles right angle prism and
Three isosceles right angle prisms；
The bevel edge side of the first isosceles right angle prism and the bevel edge side of the second isosceles right angle prism are pasted
It closes and fixes；The two forms a cube；
Described one straight flange side of third isosceles right angle prism and described second isosceles right angle prism, one straight flange side
Face paste, which is closed, fixes, the bevel edge side of the bevel edge side of the third isosceles right angle prism and the second isosceles right angle prism
Vertically；
Another straight flange side of the third isosceles right angle prism and the second isosceles right angle prism another
Straight flange side is coplanar, and the plane is oppositely arranged with first face.
The present invention also provides a kind of Doppler anemometry laser radar, the laser doppler windfinding radar includes：
Emission system, the emission system is for emitting detection laser；
Reception system, the reception system are used to obtain echo-signal of the air to the detection laser；The reception system
System includes such as claim 5 or 6 any one of them interference devices, has polarization splitting prism group, quarter wave plate and binary channels
Fabry-Perot interferometer；
Processing unit, the processing unit are used to measure atmospheric wind based on the echo-signal；
Wherein, when the Doppler anemometry laser radar works, the incident polarization splitting prism of the echo-signal
Group, a part of echo-signal directly by the quarter wave plate after, one be emitted by the Fabry-Perot interferometer is logical
Road is directly emitted, and another part echo-signal is reflected back the polarization splitting prism group by the Fabry-Perot interferometer,
In the polarization splitting prism group after two secondary reflections, it is emitted by the polarization splitting prism group, passes through 1/4 wave
The incident Fabry-Perot interferometer of piece, is emitted by another channel of the Fabry-Perot interferometer.
By foregoing description it is found that the Fabry-Perot interferometer that technical solution of the present invention provides includes：It is oppositely arranged
First transparent substrates and the second transparent substrates；There are two optical channels for the Fabry-Perot interferometer tool；Wherein, the method
Freely compose the spacing 1/n equal to Doppler frequency shift caused by satellite flight, n of Fabry-Perot interferometer are just whole more than 1
Number；The centre frequency interval in two channels is equal to the half for freely composing spacing in the Fabry-Perot interferometer.It is described
Fabry-Perot interferometer is simple in structure, high certainty of measurement, is convenient for engineer application, avoids appearance outgoing light frequency without Vinculum iuris
Fixed problem.Using the Fabry-Perot interferometer Doppler anemometry laser radar have higher measurement accuracy and
Reliability.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of Fabry-Perot interferometer provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of interference device provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
With reference to figure 1, Fig. 1 is a kind of structural schematic diagram of Fabry-Perot interferometer provided in an embodiment of the present invention, Fig. 1
Shown Fabry-Perot interferometer 13 is used for the Doppler anemometry laser radar of Seeds of First Post-flight, the Fabry-Perot interferometer 13
Including：The first transparent substrates 131 and the second transparent substrates 132 being oppositely arranged.
There are two optical channels for the tool of the Fabry-Perot interferometer 13.Wherein, the Fabry-Perot interferometer 13
It is the positive integer more than 1 freely to compose the spacing 1/n equal to Doppler frequency shift caused by satellite flight, n；The Fabry-Perot
The centre frequency interval in two channels is equal to the half for freely composing spacing in interferometer 13.Specifically, the Fabry-Perot
The spacing of freely composing of Luo Gan's interferometer 13 is equal to 10.95GHz, and the centre frequency interval in two channels is equal to 5.475GHz, transmitance
The halfwidth of curve is equal to 1.56GHz.
Optionally, there is transparent filler medium between first transparent substrates 131 and second transparent substrates 132
133, the transmitance of the transparent filler medium 133 is more than 99%, and coefficient of thermal expansion is less than 0.5/MK.Specifically, the light transmission
Filled media 133 can be devitrified glass.Transparent filler medium 133 is solid matter.Transparent filler medium 133 has very small
Coefficient of thermal expansion.It can make the spacing between two substrates by the transparent filler medium, will not be influenced by temperature
And change, there is preferable translucency, can ensure the accuracy of interferometer.
Technical solution described in the embodiment of the present invention devises a kind of novel Fabry-based on specific Parameters design
Perot interferometer 13, and filled as intracavitary using very small solid matters of coefficient of thermal expansion such as devitrified glasses, chamber length can not
The parameter of tuning, Fabry-Perot interferometer 13 passes through particular design, substantially increases frequency discrimination precision and stability.
The design scheme of Fabry-Perot interferometer 13 described in the embodiment of the present invention includes optical texture design and interferometer
Two aspect of parameter designing.
1) optical texture designs
The Fabry-Perot interferometer of the Doppler anemometry laser radar of direct detection is traditionally used for by three optical channels
Composition, two signal paths for detecting Received Signal and one are used for locking channel, pass through in the locking channel
Optical signal be used to be emitted friendship of the Frequency Locking in two signal paths to the transmittance curve of induction signal for detecting laser
At crunode.The fabry perot interferometer of this structure is not only complicated, and manufacturing cost is high, and is locked when actually measuring
Routing also usually can bring larger systematic error because of precision is relatively low, reduce measurement accuracy.Method described in the embodiment of the present invention
Fabry-Perot interferometer is made of two channels, and outgoing detection laser frequency and Received Signal frequency are logical by the two
Road measures, both signal lights (detection laser and Received Signal) separate in the time domain, compared to traditional threeway
Road design method, Fabry-Perot interferometer described in inventive embodiments are the measurement accuracy that outgoing detection laser can be improved, to
Improve measuring wind speed precision, can also eliminate with different light paths measures respectively be emitted laser frequency and echo-signal frequency band come be
System error.
2) interferometer parameter designing
For twin-channel fabry perot interferometer parameter designing mainly there are three parameter, freely compose spacing FSR, two
Centre frequency the interval delta v, the transmittance curve halfwidth FWHM in two channels in a channel.
The selection of these three parameters should consider processing and manufacturing ability, while determine the frequency detecting essence of interferometer again
Degree.Fabry perot interferometer considers two above factor, and inventor applies warp according to the laser radar of laboratory for many years
It tests, it is proposed that a kind of parameter optimization for the twin-channel fabry perot interferometer being generally applicable to Doppler anemometry laser radar
Scheme, the program have higher novelty.
First, the spectrum width and Doppler anemometry of molecule back scattering spectrum will usually be considered by freely composing the selection of spacing FSR
The fabry perot interferometer of the working condition of laser radar, this secondary design is carried for satellite platform, is transported according to satellite platform
Doppler frequency shift caused by satellite flight can be calculated in laser emitting side in the distribution of capable speed and its running track
To component can freely be composed caused by spacing FSR is chosen for satellite flight to eliminate this frequency shift amount to the error brought of measurement
The 1/n (n is positive integer) of Doppler frequency shift, n are the positive integer more than 1, in conjunction with the limit of fabry perot interferometer machining accuracy
System chooses suitable n values, and appropriate spacing FSR is freely composed to choose.
Secondly, the interval delta v in two channels is chosen for the half of FSR, and the transmittance curve in two channels is about two at this time
Curved intersection point is symmetrical, to bent come the transmitance for scanning fabry perot interferometer with tunable pulse laser
When line, only need to scan 1/2 FSR can obtain complete transmittance curve, greatly reduce to continuously adjustable pulse laser
The wavelength tuning range requirement of device, is of great significance for engineer application.
Finally, after FSR and Δ v are determined, then fabry perot interferometer system caused by measuring wind speed is missed
Difference is the monotropic function of halfwidth FWHM, is chosen so that the FWHM of error minimum is design parameter.
According to the above parameter optimization scheme, the embodiment of the present invention devises above-mentioned for spaceborne Doppler anemometry laser radar
Fabry perot interferometer, parameter is as follows：FSR is 10.95GHz, and the peak intervals δ v in channel 1 and channel 2 are 5.475GHz,
The full widths at half maximum FWHM of transmittance curve is 1.56GHz.
Fabry-Perot interferometer described in the embodiment of the present invention has as follows a little：
The survey of conventional measurement wind three channel Fabry-Perot interferometers of laser radar system is realized with two signal paths
Measure function, and precision higher.
Echo-signal passes sequentially through two channels, compared to traditional two-channel method Fabry-Perot interferometer by signal light one
It is divided into two ways for respectively enteing different channels, Fabry-Perot interferometer described in the embodiment of the present invention is by the profit of echo-signal
It is doubled with rate, improves the signal-to-noise ratio of system.
The parameter that the fabry perot interferometer that optimization obtains is considered in terms of engineer application and measurement accuracy two, makes
The transmittance curve of two signal paths of interferometer is obtained about two curved intersection point symmetries, is greatly reduced to continuously adjustable arteries and veins
The requirement for rushing the wavelength tuning range of laser, is more conducive to Project Realization.
Based on Fabry-Perot interferometer described in above-described embodiment, another embodiment of the present invention additionally provides a kind of interference
Device, as shown in Fig. 2, Fig. 2 is a kind of structural schematic diagram of interference device provided in an embodiment of the present invention, interference dress shown in Fig. 2
Set including：Quarter wave plate 12, the quarter wave plate 12 have opposite the first face and the second face；Polarization splitting prism group 11, institute
Polarization splitting prism group 11 is stated to be oppositely arranged with first face；Twin-channel Fabry-Perot interferometer 13, the method cloth
In-perot interferometer 13 is oppositely arranged with second face.Wherein, the Fabry-Perot interferometer is above-described embodiment institute
The Fabry-Perot interferometer stated.
As shown in Fig. 2, the tool of polarization splitting prism group 11 is there are three identical isosceles right angle prism, the isosceles are straight
For angle prism tool there are one bevel edge side and two identical straight flange sides, top and bottom are two phases of face setting
Same isosceles right triangle.It is straight that three isosceles right angle prisms are followed successively by the first isosceles right angle prism 111, the second isosceles
Angle prism 112 and third isosceles right angle prism 113.
The bevel edge of the bevel edge side of the first isosceles right angle prism 111 and the second isosceles right angle prism 112
Side fitting is fixed, and the two forms a cube.Described 113 1 straight flange sides of third isosceles right angle prism and described the
The two straight flange sides of isosceles right angle prism 112 1 fitting fix, the bevel edge side of the third isosceles right angle prism 113 with
The bevel edge side of the second isosceles right angle prism 112 is vertical.Another straight flange of the third isosceles right angle prism 113
Side and 112 another straight flange side of the second isosceles right angle prism are coplanar, and the plane is opposite with first face
Setting.
The interference device is by the polarization splitting prism group 11 of optical bond, quarter wave plate 12 and Fabry-Perot interferometer
13 compositions.The bevel edge side of isosceles right angle prism in polarization splitting prism group 11 has reflecting layer.Fabry-Perot interference
There is solid filler substance between 13 two face substrates disposed in parallel of instrument.
Its course of work is：The atmospheric scattering light (echo-signal) of original incident and the detection laser of outgoing are linear polarization
Light, the angle of polarization splitting prism group 11 are matched with the polarization direction of laser so that incident ray polarized light can penetrate polarization point
The linearly polarized laser of light prism group 11, transmission becomes circularly polarized light after quarter wave plate 12, and circularly polarized light is by Fabry-Perot
One channel of interferometer 13 is divided into transmission and reflection two parts, and transmission and the ratio reflected are related with the frequency of light, transmissive portions
Point captured by detector into subsequent light path, the light of reflective portion again passes by quarter wave plate 12, polarization direction become with just
Beginning incident light is vertical, and when being incident on polarization splitting prism group 11 at this time, two secondary reflections can occur in polarization splitting prism group 11,
Another channel of light incident Fabry-Perot interferometer 13 after quarter wave plate 12 after two secondary reflections, equally also can be latter
Part light penetrates, and a part of light is reflected, and the light of transmission is captured by subsequent light path by detector, and the light of reflection again passes by
Become the linearly polarized light that polarization direction is parallel to paper after quarter wave plate 12, can be transmitted at polarization splitting prism group 11, into
Enter exterior.
The reference laser and the echo-signal of atmospheric scattering both light that outgoing detection separation by laser comes out are pressed above-mentioned successively
The course of work penetrates two channels of fabry perot interferometer, can obtain two kinds of light and penetrate fabry perot interferometer two
The light intensity I in channelR1And IR2、I1And I2, by IR1And IR2The laser pulse frequency for substituting into Fabry-Perot interferometer 13 responds letter
Number can obtain the frequency v of outgoing detection laserL, by I1And I2Substitute into the rayleigh scattering frequency of Fabry-Perot interferometer 13
Receptance function v, v-vLDoppler frequency shift as caused by air motion, to can get air wind speed.IR1And IR2For detection
Laser corresponding light intensity, I in two channels1And I2For echo-signal in two channels corresponding light.
In traditional dual edge interferometer, Received Signal light is divided into two, and respectively enters two channels, and this hair
In the interference device that Fabry-Perot interferometer 13 described in bright embodiment is constituted, Received Signal is first all incident on one
Channel, a portion light enter subsequent light path in the channel through Fabry-Perot interferometer 13, and another part light is logical at this
After road is reflected, which changes 90 degree due to passing through the wave plates of λ/4 12, polarization state twice.Another part light is in the channel quilt
After reflection, for the first time by the way that after the wave plates of λ/4 12, into polarization splitting prism group 11, meeting is in polarization splitting prism group 11
By two secondary reflections, after being emitted by polarization splitting prism group 11, the wave plates of incident λ/4 12, after second by the wave plates of λ/4 12,
Another channel of incident Fabry-Perot interferometer 13.Thus, interfere compared to traditional two-channel method Bripello
The utilization rate of instrument, signal light improves nearly 1 times, to improve the signal-to-noise ratio of measuring signal, improves measurement accuracy.
The Fabry-Perot interferometer uses total space light channel structure, with polarization splitting prism group instead of previous light
Fine beam splitting structure, improves the stability of interferometer.
Based on Fabry-Perot interferometer described in above-described embodiment and interference device, another embodiment of the present invention also carries
A kind of Doppler anemometry laser radar, the laser doppler windfinding radar has been supplied to include：Emission system receives system and place
Manage device.
The emission system is for emitting detection laser.The reception system is used to obtain air to the detection laser
Echo-signal.The reception system includes interference device described in above-described embodiment, have polarization splitting prism group, quarter wave plate with
And twin-channel Fabry-Perot interferometer.The processing unit is used to measure atmospheric wind based on the echo-signal.It is described
Processing unit can be industrial control host.
Wherein, when the Doppler anemometry laser radar works, the incident polarization splitting prism of the echo-signal
Group, a part of echo-signal (as shown in Fig. 2 cathetus arrows) directly by the quarter wave plate after, pass through the Fabry-Perot
One channel of Luo Gan's interferometer outgoing is directly emitted, and another part echo-signal (discounted shown in arrow in Fig. 2) is as described in
Fabry-Perot interferometer is reflected back the polarization splitting prism group, and two secondary reflections are passed through in the polarization splitting prism group
Afterwards, it is emitted by the polarization splitting prism group, by the incident Fabry-Perot interferometer of the quarter wave plate, passes through institute
State another channel outgoing of Fabry-Perot interferometer.
Doppler anemometry laser radar described in the embodiment of the present invention uses above-described embodiment Fabry-Perot interferometer, tool
There are higher measurement accuracy and reliability, be convenient for engineer application, avoids the problem of appearance outgoing light frequency can not lock.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For interfering disclosed in embodiment
For device and Doppler anemometry laser radar, since it is corresponding with Fabry-Perot interferometer disclosed in embodiment, so
What is described is fairly simple, and related place illustrates referring to Fabry-Perot interferometer part.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (7)
1. a kind of Fabry-Perot interferometer is used for the Doppler anemometry laser radar of Seeds of First Post-flight, which is characterized in that described
Fabry-Perot interferometer includes：
The first transparent substrates and the second transparent substrates being oppositely arranged；
There are two optical channels for the Fabry-Perot interferometer tool；
Wherein, the 1/n, n that freely compose spacing and be equal to Doppler frequency shift caused by satellite flight of the Fabry-Perot interferometer
For the positive integer more than 1；In the Fabry-Perot interferometer centre frequency interval in two channels be equal to it is described freely compose between
Away from half.
2. wanting the Fabry-Perot interferometer described in 1 according to right, which is characterized in that first transparent substrates and described the
There is transparent filler medium, the transmitance of the transparent filler medium to be more than 99%, coefficient of thermal expansion is small between two transparent substrates
In 0.5/MK.
3. wanting the Fabry-Perot interferometer described in 2 according to right, which is characterized in that the transparent filler medium is crystallite glass
Glass.
4. wanting the Fabry-Perot interferometer described in 1 according to right, which is characterized in that the Fabry-Perot interferometer from
10.95GHz is equal to by spectrum spacing, the centre frequency interval in two channels is equal to 5.475GHz, the halfwidth etc. of transmittance curve
In 1.56GHz.
5. a kind of interference device, which is characterized in that the interference device includes：
Quarter wave plate, the quarter wave plate have opposite the first face and the second face；
Polarization splitting prism group, the polarization splitting prism group are oppositely arranged with first face；
Twin-channel Fabry-Perot interferometer, the Fabry-Perot interferometer are oppositely arranged with second face；
Wherein, the Fabry-Perot interferometer is into claim 1-4 any one of them Fabry-Perot interferometers.
6. interference device according to claim 5, which is characterized in that there are three identical for the polarization splitting prism group tool
Isosceles right angle prism, there are one bevel edge side and two identical straight flange sides for the isosceles right angle prism tool；
Three isosceles right angle prisms are followed successively by the first isosceles right angle prism, the second isosceles right angle prism and third etc.
Waist right angle prism；
The bevel edge side of the first isosceles right angle prism is bonded solid with the bevel edge side of the second isosceles right angle prism
It is fixed；The two forms a cube；
It pastes the one straight flange side in described one straight flange side of third isosceles right angle prism and the second isosceles right angle prism
It closes and fixes, the bevel edge side of the third isosceles right angle prism and the bevel edge side of the second isosceles right angle prism are hung down
Directly；
Another straight flange side of the third isosceles right angle prism and another straight flange of the second isosceles right angle prism
Side is coplanar, and the plane is oppositely arranged with first face.
7. a kind of Doppler anemometry laser radar, which is characterized in that the laser doppler windfinding radar includes：
Emission system, the emission system is for emitting detection laser；
Reception system, the reception system are used to obtain echo-signal of the air to the detection laser；The reception system packet
It includes such as claim 5 or 6 any one of them interference devices, there is polarization splitting prism group, quarter wave plate and twin-channel method
Fabry-Perot interferometer；
Processing unit, the processing unit are used to measure atmospheric wind based on the echo-signal；
Wherein, when the Doppler anemometry laser radar works, the incident polarization splitting prism group of the echo-signal, one
Part echo signal directly by the quarter wave plate after, a channel being emitted by the Fabry-Perot interferometer is direct
Outgoing, another part echo-signal is reflected back the polarization splitting prism group by the Fabry-Perot interferometer, described
It in polarization splitting prism group after two secondary reflections, is emitted by the polarization splitting prism group, passes through quarter wave plate incidence
The Fabry-Perot interferometer is emitted by another channel of the Fabry-Perot interferometer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865396A (en) * | 2019-11-25 | 2020-03-06 | 浙江大学 | Frequency sweep calibration device and method for high spectral resolution laser radar |
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| CN113587962A (en) * | 2021-07-19 | 2021-11-02 | 武汉理工大学 | Single-fiber multi-dimensional F-P sensing device and measuring method thereof |
| CN113587962B (en) * | 2021-07-19 | 2022-04-19 | 武汉理工大学 | Single-fiber multi-dimensional F-P sensing device and measuring method thereof |
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