CN210689857U - Atmosphere temperature measurement system based on Raman scattering - Google Patents
Atmosphere temperature measurement system based on Raman scattering Download PDFInfo
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- CN210689857U CN210689857U CN201921865405.6U CN201921865405U CN210689857U CN 210689857 U CN210689857 U CN 210689857U CN 201921865405 U CN201921865405 U CN 201921865405U CN 210689857 U CN210689857 U CN 210689857U
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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 utility model provides an atmosphere temperature measurement system based on raman scattering, include: the light emitting device comprises a laser, a beam expanding unit and a light reflecting unit, and detection light which is emitted by the laser and passes through the beam expanding unit and the light reflecting unit is parallel or collinear with the central axis of the light receiving device; the light receiving device comprises a light converging device, a concave reflector and a convex reflector, wherein the reflecting surfaces of the concave reflector and the convex reflector are arranged oppositely, and scattered light which is opposite to the detection light emitted out of the light emitting device in direction sequentially passes through the center of the concave reflector after being reflected by the concave surface and the convex reflector and then passes through the light converging device; the scattered light which exits the light converging device is transmitted to the slit of the light splitting device through the light transmission device; the light splitting device comprises a slit, a light splitting device and a detector. The utility model has the advantages of the detection distance is far away, SNR is high.
Description
Technical Field
The utility model relates to an atmosphere is measured, in particular to atmosphere temperature measurement system based on raman scattering.
Background
The atmospheric temperature profile is an important model parameter in the processes of weather forecast, weather research and environmental pollution source analysis, and the laser radar is used as a remote sensing detection tool and is widely applied to the fields of weather parameter detection, environmental monitoring and the like.
Currently, the main methods for detecting the atmospheric temperature by the laser radar are as follows:
1. rayleigh scattering temperature measurement laser radar. Because the low aerosol and other particles are more, the Rayleigh scattering temperature measurement laser radar is easy to be interfered by the meter scattering, so the Rayleigh scattering density method temperature measurement laser radar is not suitable for being used in the low-level atmosphere.
2. High spectral resolution lidar. The receiving spectrum of the high-spectral-resolution laser radar is partially overlapped with the extremely strong Mie scattering spectrum, so that the requirement on a radar system is extremely high if the temperature information is obtained without being interfered by strong signals in an extremely narrow frequency range.
3. Raman temperature measurement laser radar. The vibration Raman scattering echo can detect the atmospheric temperature distribution at the middle upper part of the troposphere, and the rotating Raman scattering laser radar measures the atmospheric temperature distribution at the lower layer by utilizing the relationship between the rotating Raman spectral line intensity of N2 and O2 molecules and the temperature, so the atmospheric extinction has small influence on the measurement of a pure rotating Raman temperature measuring radar, and the high precision can be obtained in the low-altitude temperature detection. However, the Raman scattering sectional area is 4-5 orders of magnitude smaller than the Mie scattering sectional area, a weak Raman spectral line is extracted from the Mie scattering sectional area, the elastic scattering signal must be suppressed by 6-7 orders of magnitude, and currently, in the aspect of noise suppression, the selection of the spectral bandwidth of a spectrometer is mostly considered only, and the receiving efficiency of an optical system is ignored.
SUMMERY OF THE UTILITY MODEL
For solving not enough among the above-mentioned prior art scheme, the utility model provides an atmosphere temperature measurement system based on raman scattering that detection distance is far away, SNR is high.
The utility model aims at realizing through the following technical scheme:
the atmosphere temperature measurement system based on Raman scattering comprises:
the light emitting device comprises a laser, a beam expanding unit and a light reflecting unit, and detection light which is emitted by the laser of the light emitting device and passes through the beam expanding unit and the light reflecting unit is parallel or collinear with the central axis of the light receiving device;
the light receiving device comprises a light converging device, a concave reflector and a convex reflector, wherein the reflecting surfaces of the concave reflector and the convex reflector are arranged oppositely, and scattered light which is opposite to the detection light emitted out of the light emitting device in direction sequentially passes through the center of the concave reflector after being reflected by the concave surface and the convex reflector and then passes through the light converging device;
the scattered light which exits the light converging device is transmitted to the slit of the light splitting device through the light transmission device;
the light splitting device comprises a slit, a light splitting device and a detector.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the signal-to-noise ratio is high;
the special optical receiving device structure is combined with the double-optical-fiber optical transmission device, so that the aberration can be effectively reduced, and the angle of view of effective signals is reduced, so that the signal-to-noise ratio of the received signals is improved, higher precision is obtained for the extraction of Raman signals, meanwhile, the double-optical-fiber receiving device is adopted, the angle of view of receiving is increased, and the receiving of the effective signals is ensured to the maximum extent;
2. the light beam expanding unit compresses the divergence angle of emergent light of the laser, so that the emitted light collimation degree is improved, and the higher the collimation degree is, the longer the detection distance is.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic structural diagram of an atmospheric temperature measurement system based on raman scattering according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of an atmospheric temperature measurement system based on raman scattering in an embodiment of the present invention, as shown in fig. 1, the atmospheric temperature measurement system based on raman scattering includes:
the light emitting device comprises a laser, a beam expanding unit and a light reflecting unit, detection light emitted by the laser is reflected by the light reflecting unit after passing through the beam expanding unit, the detection light emitted out of the light reflecting unit is emitted into the atmosphere, and the direction of the detection light is parallel to or collinear with the central axis of the light receiving device;
the light receiving device comprises a light converging device, a concave reflector and a convex reflector, wherein the reflecting surfaces of the concave reflector and the convex reflector are arranged oppositely, and scattered light which is opposite to the detection light emitted out of the light emitting device in direction sequentially passes through the center of the concave reflector after being reflected by the concave surface and the convex reflector and then passes through the light converging device;
the scattered light which exits the light converging device is transmitted to the slit of the light splitting device through the light transmission device;
the light splitting device comprises a slit, a light splitting device and a detector.
To compress the optical path, further, the light reflecting unit includes:
the first reflector is used for reflecting the detection light emitted out of the beam expanding unit by the first reflector and the second reflector in sequence;
the second mirror, concave surface speculum, convex surface speculum and second mirror set gradually, and the plane of reflection of second mirror is back to convex surface speculum.
In order to improve the receiving capability of the light receiving device, the aperture of the concave reflector is larger than 250 mm.
Example 2:
according to the utility model discloses embodiment 1's atmospheric temperature measurement system based on raman scattering's application example.
In the application example, the detection light emitted by the laser has the wavelength of 355nm, the frequency is higher than 5K, and the single pulse energy is higher than 0.6 mJ; the beam expanding unit adopts the combination of a concave lens and a convex lens, and the beam expanding multiple exceeds 10; the light reflection unit comprises a first reflection mirror and a second reflection mirror, and the direction of the detection light emitted by the laser is parallel to the central axis of the light receiving device; the reflecting surfaces of the concave reflecting mirror and the convex reflecting mirror are opposite, the aperture of the concave reflecting mirror is larger than 250mm, and a through hole is formed along the central axis direction of the concave reflecting mirror; the concave reflector, the convex reflector and the second reflector are arranged in sequence, and the reflecting surface of the second reflector faces back to the convex reflector, so that the direction of detection light which is reflected by the second reflector and enters the atmosphere is opposite to the direction of scattered light which enters the light receiving device; the light converging device comprises a first convex lens and a second convex lens; the scattered light emitted out of the concave reflecting mirror is converged by the light converging device and enters the light transmission device; the optical transmission device adopts double optical fibers; the light splitting device comprises a shell, and a slit, a light splitting device and a linear array detector which are arranged in the shell, wherein the light splitting device adopts a grating.
The working mode of the atmosphere temperature measurement system is as follows:
the laser emits detection light, the detection light is expanded by the beam expanding unit, reflected by the first reflector, deflected, emitted to the second reflector and finally emitted into the atmosphere;
the scattered light is emitted from the center of the concave reflector after being sequentially reflected by the concave reflector and the convex reflector;
the scattered light emitted out of the concave reflecting mirror is converged by the light converging device and then coupled into the double optical fibers and transmitted to the slit of the light splitting device;
the scattered light is split by the grating and the detector converts the optical signal into an electrical signal.
According to the utility model discloses the benefit that application example reaches lies in: by compressing the divergence angle of the emission light path, the receiving field angle is improved, the receiving efficiency of effective signals is effectively improved, and the signal to noise ratio is improved.
Claims (8)
1. Atmospheric temperature measurement system based on raman scattering, its characterized in that: the atmosphere temperature measurement system based on Raman scattering comprises:
the light emitting device comprises a laser, a beam expanding unit and a light reflecting unit, and detection light which is emitted by the laser of the light emitting device and passes through the beam expanding unit and the light reflecting unit is parallel or collinear with the central axis of the light receiving device;
the light receiving device comprises a light converging device, a concave reflector and a convex reflector, wherein the reflecting surfaces of the concave reflector and the convex reflector are arranged oppositely, and scattered light which is opposite to the detection light emitted out of the light emitting device in direction sequentially passes through the center of the concave reflector after being reflected by the concave surface and the convex reflector and then passes through the light converging device;
the scattered light which exits the light converging device is transmitted to the slit of the light splitting device through the light transmission device;
the light splitting device comprises a slit, a light splitting device and a detector.
2. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the light reflection unit includes:
a first mirror, the detection light being reflected by the first mirror and the second mirror in sequence;
the second mirror, concave surface speculum, convex surface speculum and second mirror set gradually, and the plane of reflection of second mirror is back to convex surface speculum.
3. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the aperture of the concave reflector is larger than 250 mm.
4. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the optical transmission device adopts double optical fibers.
5. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the beam expanding unit adopts the combination of a concave lens and a convex lens, and the beam expanding multiple is more than 10.
6. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the light converging device comprises at least two convex lenses.
7. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the light splitting device adopts a grating or a prism.
8. The atmospheric thermometry system based on raman scattering according to claim 1, wherein: the light emitting direction of the laser is parallel to the central axis of the light receiving device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921865405.6U CN210689857U (en) | 2019-10-31 | 2019-10-31 | Atmosphere temperature measurement system based on Raman scattering |
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| CN201921865405.6U CN210689857U (en) | 2019-10-31 | 2019-10-31 | Atmosphere temperature measurement system based on Raman scattering |
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| CN210689857U true CN210689857U (en) | 2020-06-05 |
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