CN106772441A - A kind of ultraviolet pure rotary Raman thermometric laser radar system - Google Patents
A kind of ultraviolet pure rotary Raman thermometric laser radar system Download PDFInfo
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- CN106772441A CN106772441A CN201710045075.5A CN201710045075A CN106772441A CN 106772441 A CN106772441 A CN 106772441A CN 201710045075 A CN201710045075 A CN 201710045075A CN 106772441 A CN106772441 A CN 106772441A
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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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
-
- 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
-
- 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
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The invention discloses the ultraviolet pure rotary Raman thermometric laser radar system of one kind.The laser radar system is made up of transmitter unit, optics reception and double grating polychromator unit and opto-electronic conversion and control unit.Transmitter unit uses the 354.7nm Ultra-Violet Lasers of the solid state laser output stage narrow linewidth of injection seeded and is oriented to zenith；Optics is received and double grating polychromator unit is used to collect the rear orientation light from atmospheric substance, and the pure rotation Raman spectroscopy in scattering spectrum can be extracted with the spectral resolution of 0.2 nm, the information of atmospheric temperature is obtained using pure rotation Raman spectroscopy line strength variation with temperature.Opto-electronic conversion ensures that whole radar system works in order with control unit.Ultraviolet pure rotational Raman lidar of the invention is to allow radar to be operated in ultraviolet band, so can substantially reduce sun bias light, can be used for the round-the-clock measurement of atmospheric temperature.
Description
Technical field
The present invention relates to a kind of ultraviolet pure rotational Raman lidar system of atmospheric sounding temperature.
Background technology
Atmospheric temperature is very important parameter, and it describes the thermal balance structure of air.Temperature or many air moulds
The Important Parameters of formula, are widely used in atmospheric dynamics, in climate change and the research of synoptic process.Accurately measure air
Temperature is significant, and the structure change of atmospheric temperature can help us understand the phenomenons such as climate change.
Laser radar with its high time-space resolution ability, high detection sensitivity and can continuous probe the features such as, by extensively should
In for the remote sensing of air, ocean, land and other targets, the detection to atmospheric parameters is especially suitable for.Laser radar is surveyed
The method for measuring the following high temperature of Lower stratosphere is enriched, including：Using the Integral Technology of molecular vibration Raman signal, pure rotation is drawn
Graceful technology, hyperspectral technique etc..Integral Technology necessarily assumes that air is in statics balance state, is first finally inversed by atmospheric molecule number close
Degree, then obtain temperature.In troposphere, when particularly turbulent flow is vigorous, air needs long time to can be only achieved new static(al)
Equilibrium state is learned, radar signal needs accurately measure atmospheric temperature by prolonged accumulation (several hours).EO-1 hyperion skill
Art obtains atmospheric temperature using Rayleigh-Brillion spectral half-width variation with temperature.Due to Rayleigh-Brillion
Spectral half-width is extremely narrow, component frequency and extremely strong Mie scattering spectra overlapping.In extremely narrow frequency range, do not believed by force completely
The interference of number (Mie scattering signal) obtains temperature information, and the performance requirement to radar system is high.Pure rotary Raman technology profit
Atmospheric temperature is obtained with pure rotational raman spectrum half-breadth variation with temperature, belongs to spectroscopic temperature measurement technology.Its temperature-measurement principle ten
Divide superior, without assuming statics balance state, it is only necessary to meet thermal balance.Collision between lower atmosphere layer air molecule is non-
Often frequently, thermal balance is very easy to meet.Equipment performance requirement of the pure rotary Raman technology to radar be not harsh, it is easier to real
Existing atmospheric temperature measurement.Consider temperature-measurement principle and technical sophistication degree, pure rotary Raman technology is the survey for being best suitable for promoting
Warm mode.
Pure rotational Raman lidar has multiple spectrum extracting mode：Interferometric filter group, double grating polychromator, Fabry-
Perot Interferometer add double grating polychromator and Atomic filter plus grating etc..Interferometric filter group is to allow multi-disc to do
Optical filter cascade operation at different angles is related to, the unilateral spectrum of pure rotation Raman spectroscopy Stokes or anti-Stokes is extracted
Line.The advantage of interferometric filter group：Simple and stable structure, debugging is convenient, is highly suitable for severe environments and extracts pure rotary Raman
Spectrum.Double grating polychromator is another major way beyond interferometric filter group, it can extract simultaneously Stokes and
Anti-Stokes both sides have the spectral line of same or similar temperature dependency.Double grating polychromator to environment temperature equally not
Sensitivity, centre wavelength and reception bandwidth are highly stable.Most pure rotational Raman lidars are operated in visible light wave range (532nm
), this wave band is placed exactly near the peak value of solar radiation power spectrum, measures atmospheric temperature effect on daytime bad.Fabry-
Perot Interferometer（FPI）Plus double grating polychromator and Atomic filter add grating can also realize day temperature survey
Amount.But, both pure rotational Raman lidar technical sophistications, system is unstable, it is impossible to the big temperature of measurement reliably and with long-term
Degree.
The content of the invention
The purpose of the present invention is to propose to a kind of ultraviolet pure rotary Raman thermometric laser radar system, ensureing temperature-measurement principle
On the basis of technical sophistication degree, the conventional detection of round-the-clock can be carried out to atmospheric temperature.The laser radar by transmitter unit,
Optics is received and three parts such as double grating polychromator unit and opto-electronic conversion and control unit composition, and wherein transmitter unit is to use
To produce the part of 354.7nm wavelength lasers, it is therefore an objective to produce UV laser pulses and be transmitted in the air, make itself and air
In matter interaction, produce backscattering echo.Optics is received and double grating polychromator unit is used to collect echo-signal,
Extract the pure rotation Raman spectroscopy Stokes from atmospheric molecule in echo-signal（J6 and J12）And anti-Stokes（J8 and
J14）Bilateral spectral line, and wiping out background noise.Opto-electronic conversion mainly realizes opto-electronic conversion, photon counting and number with control unit
According to functions such as storages.
To achieve these goals, the technical scheme of present invention offer is：
A kind of ultraviolet pure rotary Raman thermometric laser radar system, including transmitter unit, optics are received and double grating polychromator list
Unit and opto-electronic conversion and control unit, the transmitter unit include seed laser, Nd:YAG solid state lasers, beam expander,
Catadioptric mirror；Solid state laser produce 354.7nm Ultra-Violet Laser, by beam expander carry out 5 times expand after reflected by catadioptric mirror
To in air；
The optics is received and double grating polychromator unit includes that telescope, aperture, collimation are saturating according to opticpath successively
Mirror, 45 degree of speculums, bandpass filter, lens, optical fiber 1, fiber mode blender, optical fiber 2, double grating polychromators；
After laser is received with the rear orientation light of atmospheric interaction by Cassegrain's formula telescope, it is accumulated to be placed on and looks in the distance
On the aperture of mirror focal plane, quasi-parallel light is changed into by collimation lens by the light of aperture, quasi-parallel light is by 45
Degree speculum reflexes to a piece of centre wavelength 354.7nm, in the bandpass filter of the mean transmissivity more than 90% of 350-360nm
Piece, core diameter is entered for 1000 μm by the light of bandpass interference filter outgoing by Lens Coupling, and numerical aperture is 0.22 optical fiber 1,
The emergent light of optical fiber 1 passes through fiber mode blender（FMH）It is 600 μm to import core diameter, during numerical aperture is 0.22 optical fiber 2, light
Echo-signal is imported double grating polychromator by fine 2 to be used to extract pure rotary Raman signal, measures atmospheric temperature；
The opto-electronic conversion includes photon counter, computer with control unit；The optical signal of double grating polychromator output passes through
Photomultiplier is connected with photon counter, and photon counter is connected with computer.
The double grating polychromator includes two-stage list grating polychromator, every grade of polychromator structure all same, first order polychrome
Instrument includes grating 1, collimation-plus lens 1, fibre bundle array end face 1；Second level polychromator includes that grating 2, collimation-convergence are saturating
Mirror 2, fibre bundle array end face 2；Two-stage list grating polychromator is connected by fibre bundle array 4；First order list grating polychromator
Effect is that spectrum is separated, and the elastomer signal of its output carries out signal acquisition in exporting to 1-PMT1 of photomultiplier by optical fiber 3；
Pure rotary Raman signal is imported into the second level of double grating polychromator by optical fiber 4, and the output light of the second level is respectively by optical fiber 5 and light
Fine 6 derive, and being directed respectively into 3-PMT3 of 2-PMT2 of photomultiplier and photomultiplier by optical fiber 5 and optical fiber 6 carries out letter
Number collection；
Optical fiber 3, optical fiber 5 and optical fiber 6 are connected with photomultiplier 1, photomultiplier 2 and photomultiplier 3 respectively, photoelectricity times
Increase pipe PMT1, PMT2 and PMT3 to be connected with 3 passage photon counters, opto-electronic conversion, photon counter are carried out by photomultiplier
Electric signal to changing is acquired, and is finally output to be stored in the computer that is connected with photon counter.
The centre wavelength 354.7nm of the bandpass filter, 90% is more than in the mean transmissivity of 350-360nm.
The optical fiber 1 and optical fiber 2 are two optical fiber of different core diameters, can expand the field of view of receiver of radar, can allow remittance
Gather into optical fiber（F2）Light distribution evenly.
Compared with prior art, the present invention uses ultraviolet emission light source, and Stokes is extracted simultaneously using double grating monochromator
With the spectral line that anti-Stokes both sides have same or similar temperature dependency；Suppress elastic scattering and sun background simultaneously
Light, can well obtain purity rotary Raman spectrum very high, and with long-term stability and reliable measurement atmospheric temperature.
Altitude range is measured daytime near the ground to 2km or so, night, near the ground to 10km, is adapted to the big temperature of high-spatial and temporal resolution
The popularization of degree round-the-clock measurement.
Brief description of the drawings
Fig. 1 is a kind of ultraviolet pure rotary Raman thermometric laser radar system fundamental diagram of the embodiment of the present invention.
Fig. 2 is the double grating polychromator schematic diagram of the embodiment of the present invention.
Fig. 3 is the fibre bundle array end face 1 of the embodiment of the present invention and the optical fiber layout of fibre bundle array end face 2, its
In, F represents optical fiber, F1 generation mass color fibre 1, F41Represent first optical fiber in optical fiber 4；Other are by that analogy.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
It is of the invention to it is critical only that using the ND of injection seeded:The frequency tripled laser of YAG solid state lasers（355nm）As
Launching light, and gather the bilateral pure rotation Raman spectroscopies of Stokes and anti-Stokes simultaneously using double grating polychromator（Frequently
Rate is symmetrical）Carry out atmospheric temperature measurement.Because double grating polychromator is equally insensitive to environment temperature, centre wavelength and receive band
It is wide highly stable, and use the laser of ultraviolet 355nm wave bands as transmitting light source, sun bias light can be effectively reduced to echo
The influence of signal, is capable of achieving the round-the-clock observation of atmospheric temperature.
Laser radar system of the invention is made up of three parts, i.e., transmitter unit, optics are received and double grating polychromator list
Unit and photoelectric conversion and and control unit.Such as accompanying drawing 1.
Transmitter unit is by by seed laser, Nd:YAG solid state lasers, beam expander, catadioptric microscope group into.Solid state laser
The Ultra-Violet Laser of the 355nm of generation, by beam expander carry out 5 times expand after air reflexed to by catadioptric mirror.
Laser is received with the rear orientation light of atmospheric interaction by Cassegrain's formula telescope of 450mm effective apertures
Afterwards, it is accumulated and is placed on the aperture of telescope focal plane.Changed into by collimation lens by the light of aperture
Quasi-parallel light with certain angle of divergence.Quasi-parallel light reflexes to a piece of centre wavelength 354.7nm by 45 degree of speculums,
Bandpass filter of the mean transmissivity of 350-360nm more than 90%.Its effect：The light for entering beam splitting system is limited to ratio
In narrower frequency range, prevent spectrum from bypassing the immediate leadership overlap, and reduce the bandwidth of radar signal bias light.By bandpass interference filter
The light of outgoing enters core diameter for 1000 μm by Lens Coupling, and numerical aperture is 0.22 optical fiber 1.The emergent light of optical fiber 1 passes through optical fiber
Mode mixer（FMH）It is 600 μm to import core diameter, during numerical aperture is 0.22 optical fiber 2.Optical fiber 2 imports echo-signal double
Grating polychromator is used to extract pure rotary Raman signal, measures atmospheric temperature.Two are connected using fiber mode blender (FMH)
The optical fiber of different core diameters, a part of light intensity of inevitable loss.But, many benefits can be brought using this connected mode：Can be with
Expand radar field of view of receiver, can allow converge into optical fiber 2 light distribution evenly.
Double grating polychromator is made up of two-stage list grating polychromator.Every grade of polychromator structure is all identical, first order polychromator
Including grating 1, collimation-plus lens 1, fibre bundle array end face 1；Second level polychromator includes grating 2, collimation-plus lens
2nd, fibre bundle array end face 2；Two-stage list grating polychromator is connected by fibre bundle array 4.Such as accompanying drawing 2.First order monochromatic light grid are more
The effect of color instrument is that spectrum is separated, and optical fiber 3 extracts elastomer signal and is exported to photomultiplier 1 in the first focal plane
（PMT1）In carry out signal acquisition.Pure rotary Raman signal be respectively Stokes J6 and J12 and anti-Stokes J8 and
J14 is then extracted by four optical fiber 4 and is imported second level list grating polychromator.Second level list grating polychromator by Stokes and
Anti-Stokes both sides are all low（J6、J8）And height（J12、J14）Two parts spectral line be merged into optical fiber 5 and optical fiber 6, and
It imported into photomultiplier 2（PMT2）With photomultiplier 3（PMT3 signal acquisition is carried out in).Meanwhile, second optical grating diffraction
The elastic veiling glare entrained by pure rotary Raman signal that will be extracted from first order list grating polychromator is separated, and is further carried
High-purity rotary Raman passage realizes that pure rotary Raman passage is excellent to the Out-of-band rejection of elastic wavelength to the Out-of-band rejection of elastic wavelength
In 8 orders of magnitude.
The end face of optical fiber 2 is positioned on the focal plane of lens 1, and the light sent by it is by diameter 120mm, focal length
The lens 1 of 285mm are incident on reflective balzed grating, 1 after collimating, and the parameter of reflective balzed grating, 1 is as shown in table 1.Through light
The light of the dispersion of grid 1 is converged on focal plane again by lens 1, is placed on the fibre bundle array end face 1 of focal plane special
The optical fiber that positioning is put is received.Wherein, elastomer signal is received by optical fiber 3 and derives the 1st grade of monochromatic grating polychromator；Pure rotary Raman
J8 the and J14 signals of J6, J12 and anti-Stokes of Stokes are composed by optical fiber 4（4 core diameters are 600 μm, and numerical aperture is
0.22 optical fiber composition）In receiving and being transferred to the 2nd grade of grating polychromator.The other end of optical fiber 4 is fixed on fibre bundle array
On another end face 2, also it is accurately positioned in diameter 120mm, focal length as on the focal plane of the lens 2 of 285mm.By the 1st grade of light
Collimated as directional light is incident on reflective balzed grating, 2 by lens 2 after the light outgoing that grid polychromator is extracted, it is reflective to glare
Grid 2 have and the identical parameter of grating 1 and working method.The self-aggregation of lens 2 is again passed by focal plane by the light of the diffraction of grating 2
On.The optical fiber layout of fibre bundle array end face 1 and fibre bundle array end face 2.Such as accompanying drawing 3.
Second level list grating polychromator is the backlight road of the first order, and be all on Stokes and anti-Stokes both sides by it
It is low（J6、J8）And height（J12、J14）Two parts spectral line be merged into optical fiber 5 and optical fiber 6, and imported into photomultiplier 2
（PMT2）With photomultiplier 3（PMT3 signal acquisition is carried out in).Meanwhile, second optical grating diffraction will be from first order monochromatic light
The elastic veiling glare entrained by pure rotary Raman signal extracted in grid polychromator is separated, and further improves pure rotary Raman passage
To the Out-of-band rejection of elastic wavelength.The effect of first order list grating polychromator is that spectrum is separated, and optical fiber 3 is extracted in the first focal plane
Elastomer signal is simultaneously exported to photomultiplier transit 1（PMT1）In carry out signal acquisition.
Opto-electronic conversion includes that photomultiplier, Multichannel photon counter and computer are constituted with control unit.It is main
Realize the functions such as opto-electronic conversion, photon counting, data storage.Ensure that whole laser radar system works in order.
Optical fiber 3, optical fiber 5 and optical fiber 6 respectively with photomultiplier 1（PMT1）, photomultiplier 2（PMT2）With photoelectricity times
Increase pipe 3（PMT3) it is connected, photomultiplier PMT1, PMT2 and PMT3 are connected with 3 passage photon counters.Entered by photomultiplier
Row opto-electronic conversion, 3 passage photon counters are acquired to the electric signal changed, and are finally output to what is be connected with photon counter
Stored in computer.
The elastic and pure rotary Raman signal that radar is extracted imports photomultiplier (PMT) and is detected by optical fiber.PMT
It is the light-detecting device with high sensitivity and ultrafast time response, there is high-gain and low dark noise, is work
In ultraviolet-near infrared band laser radar first-selection sensitive detection parts.Wherein photomultiplier is using HAMAMATSU companies of Japan
H10721-110, spectral response range is 230-700nm.What the output pulse of photomultiplier was produced by German Licel companies
Signal picker TR20-160 carries out multiple sampling and cumulative to fast-changing echo-signal, finally can obtain laser radar
Raw radar data, upload to computer and calculated, stored.
Table 1（Such as following table）It is the parameter list of the reflective balzed grating, of the embodiment of the present invention
Claims (4)
1. a kind of ultraviolet pure rotary Raman thermometric laser radar system, including transmitter unit, optics are received and double grating polychromator
Unit and opto-electronic conversion and control unit, it is characterised in that：The transmitter unit includes seed laser, Nd:YAG solids swash
Light device, beam expander, catadioptric mirror；Solid state laser produce 354.7nm Ultra-Violet Laser, by beam expander carry out 5 times expand after
In air being reflexed to by catadioptric mirror；
The optics is received and double grating polychromator unit includes that telescope, aperture, collimation are saturating according to opticpath successively
Mirror, 45 degree of speculums, bandpass filter, lens, optical fiber 1, fiber mode blender, optical fiber 2, double grating polychromators；
After laser is received with the rear orientation light of atmospheric interaction by Cassegrain's formula telescope, it is accumulated to be placed on and looks in the distance
On the aperture of mirror focal plane, quasi-parallel light is changed into by collimation lens by the light of aperture, quasi-parallel light is by 45
Degree speculum reflexes to a piece of centre wavelength 354.7nm, in the bandpass filter of the mean transmissivity more than 90% of 350-360nm
Piece, core diameter is entered for 1000 μm by the light of bandpass interference filter outgoing by Lens Coupling, and numerical aperture is 0.22 optical fiber 1,
It is 600 μm that the emergent light of optical fiber 1 imports core diameter by fiber mode blender, and during numerical aperture is 0.22 optical fiber 2, optical fiber 2 will
Echo-signal imports double grating polychromator to be used to extract pure rotary Raman signal, measures atmospheric temperature；
The opto-electronic conversion includes photon counter, computer with control unit；The optical signal of double grating polychromator output passes through
Photomultiplier is connected with photon counter, and photon counter is connected with computer.
2. the ultraviolet pure rotary Raman thermometric laser radar system of one kind according to claim 1, it is characterised in that：It is described double
Grating polychromator includes two-stage list grating polychromator, every grade of polychromator structure all same, and first order polychromator includes grating 1, standard
Directly-plus lens 1, fibre bundle array end face 1；Second level polychromator includes grating 2, collimation-plus lens 2, fibre bundle array
End face 2；Two-stage list grating polychromator is connected by fibre bundle array 4；The effect of first order list grating polychromator is that spectrum is separated,
The elastomer signal of its output carries out signal acquisition in exporting to 1-PMT1 of photomultiplier by optical fiber 3；Pure rotary Raman signal by
Optical fiber 4 imported into the second level of double grating polychromator, and the output light of the second level is derived by optical fiber 5 and optical fiber 6 respectively, by optical fiber 5
Being directed respectively into 3-PMT3 of 2-PMT2 of photomultiplier and photomultiplier with optical fiber 6 carries out signal acquisition；
Optical fiber 3, optical fiber 5 and optical fiber 6 are connected with photomultiplier 1, photomultiplier 2 and photomultiplier 3 respectively, photoelectricity times
Increase pipe PMT1, PMT2 and PMT3 to be connected with 3 passage photon counters, opto-electronic conversion, photon counter are carried out by photomultiplier
Electric signal to changing is acquired, and is finally output to be stored in the computer that is connected with photon counter.
3. the ultraviolet pure rotary Raman thermometric laser radar system of one kind according to claim 1, it is characterised in that：The band
The centre wavelength 354.7nm of pass filter, 90% is more than in the mean transmissivity of 350-360nm.
4. the ultraviolet pure rotary Raman thermometric laser radar system of one kind according to claim 1, it is characterised in that：The light
Fine 1 is two optical fiber of different core diameters with optical fiber 2.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110988913A (en) * | 2019-12-20 | 2020-04-10 | 江苏亮点光电科技有限公司 | Semiconductor laser ceilometer with double optical axis structure |
| CN111256870A (en) * | 2020-01-21 | 2020-06-09 | 中国科学院合肥物质科学研究院 | Temperature measurement laser radar system based on pure rotation Raman spectrum full extraction and detection method |
| CN111912338A (en) * | 2020-06-29 | 2020-11-10 | 山西大学 | Displacement measurement device and method based on electromagnetic induction transparent atomic grating |
| JP7477919B2 (en) | 2018-10-12 | 2024-05-02 | 英弘精機株式会社 | Weather observation lidar |
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