CN111650606A - Atmospheric temperature and humidity profile laser radar system - Google Patents
Atmospheric temperature and humidity profile laser radar system Download PDFInfo
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- CN111650606A CN111650606A CN202010583275.8A CN202010583275A CN111650606A CN 111650606 A CN111650606 A CN 111650606A CN 202010583275 A CN202010583275 A CN 202010583275A CN 111650606 A CN111650606 A CN 111650606A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention discloses an atmospheric temperature and humidity profile laser radar system, which is characterized by comprising the following components: the system comprises an industrial personal computer, a laser emission system, a receiving light splitting system and a data acquisition system; the laser emission system comprises a laser and an optical guide assembly, the laser is electrically connected with the industrial personal computer, and the optical guide assembly guides laser emitted by the laser into the atmosphere; the receiving light splitting system comprises a telescope, an optimizing assembly and a light splitting assembly, wherein the optimizing assembly collimates light signals received by the telescope and then divides the light signals into five groups of light signals; the data acquisition system comprises an acquisition card and five groups of photoelectric sensors electrically connected with the acquisition card, each group of photoelectric sensors corresponds to one group of optical signals, and the acquisition card is electrically connected with the industrial personal computer. The invention overcomes the defects of the prior art and can realize the detection of the vertical spatial distribution of the temperature and the detection of the temperature boundary layer.
Description
Technical Field
The invention belongs to the technical field of laser radars, and particularly relates to an atmospheric temperature and humidity profile laser radar system.
Background
Laser radar (LIDAR, LIght Detection And Ranging) uses laser as a LIght source, remotely senses the atmosphere by detecting an echo signal generated by the interaction between the laser And the atmosphere, And has high-precision distance resolution capability. The interaction of the laser and the atmosphere can generate a radiation signal containing related information such as gas atoms, molecules, atmospheric aerosol particles, clouds and the like, and information about atmospheric components such as the gas atoms, the molecules, the atmospheric aerosol particles, the clouds and the like can be obtained from the radiation signal by using a corresponding inversion method.
Meanwhile, the laser radar can obtain information such as an atmospheric temperature profile, an atmospheric humidity profile, an ozone profile and the like, is indispensable monitoring equipment in the meteorological and environmental protection industries, and has an increasingly wide application prospect. The distribution of the temperature profile of the atmospheric boundary layer is closely related to atmospheric phenomena such as atmospheric inverse temperature, urban heat islands and the like, and is an important parameter for atmospheric forecast, and the temperature profile Raman lidar system has very important significance on the change rule of the atmospheric inverse temperature characteristic of the boundary layer and the urban heat island effect. The temperature profile Raman laser radar mainly utilizes Raman backscattering signals of nitrogen and oxygen in the atmosphere to invert the time-space distribution condition of the temperature profile in the atmosphere.
Disclosure of Invention
The invention provides an atmospheric temperature and humidity profile laser radar system for realizing synchronous measurement of atmospheric temperature and humidity profiles.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides an atmospheric temperature and humidity profile laser radar system which characterized in that includes:
the system comprises an industrial personal computer, a laser emission system, a receiving light splitting system and a data acquisition system;
the laser emission system comprises a laser and an optical guide assembly, the laser is electrically connected with the industrial personal computer, and the optical guide assembly guides laser emitted by the laser into the atmosphere;
the receiving light splitting system comprises a telescope, an optimizing assembly and a light splitting assembly, wherein the optimizing assembly collimates light signals received by the telescope and then divides the light signals into five groups of light signals;
the data acquisition system comprises an acquisition card and five groups of photoelectric sensors electrically connected with the acquisition card, each group of photoelectric sensors corresponds to one group of optical signals, and the acquisition card is electrically connected with the industrial personal computer.
Furthermore, the optical guiding assembly comprises a first reflecting mirror, a beam expander and a second reflecting mirror, wherein the first reflecting mirror reflects laser emitted by the laser to the beam expander, and the laser is reflected to the atmosphere by the second reflecting mirror after being expanded by the beam expander.
Furthermore, the beam expanding multiple of the beam expander is at least 3 times, and the light transmittance is more than or equal to 95%.
Further, the beam expansion multiple of the beam expander is 5 times.
Furthermore, the laser is an ultraviolet laser with single pulse energy larger than 150mJ, and the wavelength is 355 nm.
Furthermore, the optimization component comprises a grating, a third reflector and a collimating lens, and optical signals received by the telescope are subjected to grating processing and then transmitted to the collimating lens by the third reflector for collimation processing; the light splitting component comprises a first color splitting sheet, a second color splitting sheet, a first optical filter, a third color splitting sheet, a fourth optical filter and a fifth optical filter which are sequentially arranged on a light path, wherein the first color splitting sheet divides an optical signal into two paths, one path of the optical signal is filtered by the sixth optical filter to obtain a first group of optical signals, the second color splitting sheet divides the optical signal from the first color splitting sheet into two paths, one path of the optical signal is filtered by the seventh optical filter to obtain a second group of optical signals, the first optical filter divides the optical signal from the second color splitting sheet into two paths, one path of the optical signal is a third group of optical signals, the third color splitting sheet divides the optical signal from the first optical filter into two paths, one path of the optical signal is filtered by the second optical filter and the third optical filter to obtain a fourth group of optical signals, and the fourth optical filter and the fifth optical filter.
Further, the wavelength of the first set of optical signals is 407nm, the wavelength of the second set of optical signals is 386.7nm, the wavelength of the third set of optical signals is 354.7nm, the wavelength of the fourth set of optical signals is 354.05nm, the wavelength of the fifth set of optical signals is 353.2nm,
furthermore, the photoelectric sensor consists of a photomultiplier and a converging lens arranged in front of the photomultiplier, and the converging lens converges light signals to the photomultiplier.
Compared with the prior art, the invention has the following implementation effects: the system of the invention realizes the separation of optical signals with wavelengths of 353.2nm, 354.05nm, 354.7nm, 386.7nm and 407.5nm by separating the optical signals received by the telescope, so that the system can obtain accurate contour lines of atmospheric temperature and humidity, has stable result and can realize the detection of temperature vertical spatial distribution and the detection of a temperature boundary layer.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a laser 1 of an atmospheric temperature and humidity profile laser radar system emits laser with a specific wavelength, the laser wavelength of the system is 355nm, and the single pulse energy is more than 160 mJ; after high-energy laser is emitted, the high-energy laser is firstly reflected to an inlet of a beam expander 3 through a first reflecting mirror 2, the beam expansion multiple of the beam expander is 5 times, the light transmittance is larger than or equal to 95%, after the high-energy laser passes through the beam expander, the divergence angle of a light beam is optimized, the laser reaches a second reflecting mirror 4, the laser is emitted to the atmosphere through the second reflecting mirror 4 to react with atmospheric molecules, the Raman effect is generated, and backward scattering light signals with the wavelengths of 353.2nm, 354.05nm, 354.7nm, 386.7nm and 407.5nm are excited.
The backward scattering light signals are received by a telescope 5, and firstly reach a diaphragm 6, the telescope adopts an aspheric surface large-caliber Cassegrain system and an aspheric surface primary mirror, so that the field of view dispersion light spots are small enough, the caliber is 16 inches, and the strong enough scattering signals can be received; through the diaphragm 6, stronger sunlight is inhibited, effective optical signals are reflected to the collimating lens 20 through the third reflecting mirror 7, the collimating lens is formed by combining two groups of lenses, optical signals with various wavelengths are optimized through the collimating lens, and then the optical signals penetrate to the receiving light splitting system.
Referring to fig. 1, the effective optical signal is optimized and then reaches a first dichroic filter 10, after passing through the first dichroic filter 10, the optical signal with 407nm is reflected to a sixth optical filter 18, and then is converged to a first photomultiplier 91 through a first converging lens 81 and converted into a corresponding electrical signal, so as to obtain a first group of signals; meanwhile, the rest wavelength signals passing through the first dichroic filter 10 are transmitted to a second dichroic filter 11, then 386.7nm optical signals are reflected to a seventh optical filter 19 through the second dichroic filter 11, and then are converged to a second photomultiplier 92 through a second converging lens 82 to be converted into corresponding electric signals, so that a second group of signals are obtained; the remaining three groups of signals are transmitted to the first optical filter 12; transmitting the optical signal with the wavelength of 354.7nm to a third converging lens 83 by using the light ray included angle, converging the optical signal to a third photomultiplier tube 93 through the third converging lens 83, and converting the optical signal into a corresponding electric signal to obtain a third group of signals; then the remaining two groups of optical signals reach a color separation plate III 13 after passing through a first optical filter 12, 354.05nm optical signals reach a fourth converging lens 84 by utilizing a second optical filter 14 and a third optical filter 15, and after passing through the fourth converging lens 84, 354.05nm optical signals reach a fifth photomultiplier 95 and are converted into corresponding electric signals to obtain a fourth group of optical signals; meanwhile, the final group of 353.2nm optical signals reach a fifth converging lens 85 through a fourth optical filter 16 and a fifth optical filter 17, then are converged to a fourth photomultiplier 94 through the fifth converging lens 85, and are converted into corresponding electric signals, so that a fifth group of signals are obtained.
The five groups of signals are acquired by a high-speed acquisition card 21, the acquisition card 21 uses a six-channel 100M acquisition card and then transmits the acquired signals to an industrial personal computer 22, and the industrial personal computer 22 is powered by an external power supply. The industrial personal computer 22 processes the signals acquired by the acquisition card 21 and obtains a humidity profile through the inversion of the first group of signals and the second group of signals; and obtaining the temperature profile by inverting the signals of the third group, the fourth group and the fifth group.
The third group, the fourth group and the fifth group of signals have extremely small wavelength difference, the system realizes the separation of the signals with different wavelengths through the combination of the first optical filter 12, the second optical filter 14, the third optical filter 15, the fourth optical filter 16 and the fifth optical filter 17 and the difference of the angle deviation and the refractive index of the laser with different wavelengths, the included angle between the first optical filter 12 and the second optical filter 14 is 12 degrees, the included angle between the second optical filter 14 and the third optical filter 15 is 8 degrees, and the included angle between the fourth optical filter 16 and the fifth optical filter 17 is 7 degrees.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an atmospheric temperature and humidity profile laser radar system which characterized in that includes:
the system comprises an industrial personal computer, a laser emission system, a receiving light splitting system and a data acquisition system;
the laser emission system comprises a laser and an optical guide assembly, the laser is electrically connected with the industrial personal computer, and the optical guide assembly guides laser emitted by the laser into the atmosphere;
the receiving light splitting system comprises a telescope, an optimizing assembly and a light splitting assembly, wherein the optimizing assembly collimates light signals received by the telescope and then divides the light signals into five groups of light signals;
the data acquisition system comprises an acquisition card and five groups of photoelectric sensors electrically connected with the acquisition card, each group of photoelectric sensors corresponds to one group of optical signals, and the acquisition card is electrically connected with the industrial personal computer.
2. The atmospheric profile lidar system of claim 1, wherein the optical guiding assembly comprises a first reflecting mirror, a beam expander and a second reflecting mirror, wherein the first reflecting mirror reflects laser light emitted by the laser to the beam expander, and the laser light is expanded by the beam expander and then reflected by the second reflecting mirror to atmosphere.
3. The atmospheric profile lidar system of claim 2, wherein the beam expander has a beam expansion factor of at least 3 times and a light transmittance of at least 95%.
4. The atmospheric temperature profile lidar system of claim 2, wherein a beam expansion factor of the beam expander is 5 times.
5. The atmospheric profile lidar system of claim 1, wherein the laser is a single pulse uv laser having an energy greater than 150mJ and a wavelength of 355 nm.
6. The atmospheric temperature and humidity profile lidar system according to claim 1, wherein the optimization component comprises a grating, a third reflector and a collimating lens, and a light signal received by the telescope is processed by the grating and then transmitted to the collimating lens by the third reflector for collimation; the light splitting component comprises a first color splitting sheet, a second color splitting sheet, a first optical filter, a third color splitting sheet, a fourth optical filter and a fifth optical filter which are sequentially arranged on a light path, wherein the first color splitting sheet divides an optical signal into two paths, one path of the optical signal is filtered by the sixth optical filter to obtain a first group of optical signals, the second color splitting sheet divides the optical signal from the first color splitting sheet into two paths, one path of the optical signal is filtered by the seventh optical filter to obtain a second group of optical signals, the first optical filter divides the optical signal from the second color splitting sheet into two paths, one path of the optical signal is a third group of optical signals, the third color splitting sheet divides the optical signal from the first optical filter into two paths, one path of the optical signal is filtered by the second optical filter and the third optical filter to obtain a fourth group of optical signals, and the fourth optical filter and the fifth optical filter.
7. The atmospheric profile lidar system of claim 6, wherein the first set of optical signals has a wavelength of 407nm, the second set of optical signals has a wavelength of 386.7nm, the third set of optical signals has a wavelength of 354.7nm, the fourth set of optical signals has a wavelength of 354.05nm, and the fifth set of optical signals has a wavelength of 353.2 nm.
8. The atmospheric profile lidar system of claim 1, wherein the photosensor comprises a photomultiplier tube and a focusing lens disposed in front of the photomultiplier tube, the focusing lens focusing the optical signal to the photomultiplier tube.
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| CN202010583275.8A CN111650606A (en) | 2020-06-23 | 2020-06-23 | Atmospheric temperature and humidity profile laser radar system |
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| CN202010583275.8A CN111650606A (en) | 2020-06-23 | 2020-06-23 | Atmospheric temperature and humidity profile laser radar system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116299366A (en) * | 2023-05-17 | 2023-06-23 | 合肥中科光博量子科技有限公司 | Online calibration method for temperature Raman laser radar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116299366A (en) * | 2023-05-17 | 2023-06-23 | 合肥中科光博量子科技有限公司 | Online calibration method for temperature Raman laser radar |
| CN116299366B (en) * | 2023-05-17 | 2023-08-15 | 合肥中科光博量子科技有限公司 | Online calibration method for temperature Raman laser radar |
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