CN220854653U - Atmospheric water vapor measuring device based on Raman spectrum - Google Patents
Atmospheric water vapor measuring device based on Raman spectrum Download PDFInfo
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- 238000001237 Raman spectrum Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000001069 Raman spectroscopy Methods 0.000 claims description 50
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- 230000005540 biological transmission Effects 0.000 claims description 13
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- 230000003595 spectral effect Effects 0.000 claims description 7
- 238000004611 spectroscopical analysis Methods 0.000 claims 2
- 238000001228 spectrum Methods 0.000 abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000005427 atmospheric aerosol Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
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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 utility model discloses an atmospheric vapor measuring device based on Raman spectrum, which comprises a telescope system, a laser source reflector, a collimation and beam expansion device, a central data processing unit and a spectrum light splitting detection system for spectrum detection of laser focused by the telescope system, wherein the laser and the spectrum light splitting detection system are connected with the central data processing unit, the laser source reflector and the collimation and beam expansion device are arranged in the telescope system, the laser is arranged on the telescope system, the laser source reflector is arranged between a secondary mirror of the telescope system and a laser incident end of the telescope system and is positioned on an emergent light path of the laser, the collimation and beam expansion device is arranged on a reflected light path of the laser source reflector, and the collimation and beam expansion device can emit reflected light of the laser source reflector after being subjected to multiple beam expansion collimation. The utility model can improve the intensity of the laser reflected signal, thereby improving the atmospheric water vapor measurement precision.
Description
Technical Field
The utility model belongs to the field of environmental monitoring, and particularly relates to an atmospheric water vapor measuring device based on Raman spectrum.
Background
The water vapor is a gas with small content in the atmosphere and important effect, has important influence on weather and climate change, and has important significance on the atmospheric environment and human production and life. In the traditional measurement, the humidity of each layer in the atmosphere is measured by adopting a sounding balloon generally through a sounding means, and then the moisture content of the atmosphere is calculated by integrating the humidity. The method is limited by sounding conditions, has high cost, and has balloon travel errors and discontinuity of measurement data, which are insufficient to distinguish the space-time change of water vapor. Then, along with the development and improvement of the detection technology, means such as a microwave radiometer, a solar radiometer and a GPS technology are developed successively to estimate and invert the water vapor content in the atmosphere. The solar radiometer uses the sun as a light source to measure the water vapor absorption and transmission rate of certain wave bands in the atmosphere, uses the relation between the solar radiometer and the water vapor content to invert the water vapor content, is greatly influenced by cloud or background temperature, and is difficult to provide available data due to the influence of raindrops on radiation when precipitation occurs.
The Raman laser radar is a novel laser radar for detecting atmospheric aerosol and water vapor, which is developed in recent years, and utilizes the Raman scattering effect of laser and atmospheric molecules such as nitrogen (N 2), water vapor (H 2 O), oxygen (O 2) and the like to realize the detection and research of the atmospheric characteristics according to the interdependence characteristic between specific scattered light intensity and the atmospheric molecular density. However, when the laser radar (see CN 202837189U) detects at present, the collectable laser reflection signal is weaker because the emitted light is outside the receiving telescope, so that the characteristic spectrum in the reflected light is fewer, and the atmospheric water vapor measurement precision is lower when the method is used for detection.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model aims to provide an atmospheric vapor measurement device based on Raman spectrum, which can improve the intensity of laser reflection signals and further improve the atmospheric vapor measurement precision.
The technical scheme adopted by the utility model is as follows:
an atmospheric vapor measuring device based on Raman spectrum comprises a telescope system, a laser source reflector, a collimation beam expander, a central data processing unit and a spectrum spectroscopic detection system for performing spectrum detection on laser focused by the telescope system, wherein the laser and the spectrum spectroscopic detection system are connected with the central data processing unit,
The laser light source reflector and the collimation beam expander are arranged in the telescope system, the laser is arranged on the telescope system, the laser light source reflector is arranged between a secondary mirror of the telescope system and a laser incidence end of the telescope system and is positioned on an emergent light path of the laser, the laser light source reflector can reflect emergent light of the laser out of the laser incidence end of the telescope system, the collimation beam expander is arranged on a reflected light path of the laser light source reflector, and the collimation beam expander can emit reflected light of the laser light source reflector after multiple beam expansion collimation.
Preferably, the reflected light path of the laser source reflector is coaxial with the telescope system.
Preferably, the laser is arranged on the side wall of the telescope system, and the side wall of the telescope system is provided with a light passing hole for the emergent light of the laser to pass through.
Preferably, an optical fiber is connected to the focal hole of the telescope system, one end of the optical fiber is located at the focal point of the secondary mirror, and the other end of the optical fiber is connected to the spectrum spectroscopic detection system.
Preferably, the atmospheric vapor measuring device based on Raman spectrum further comprises an adjusting bracket, wherein the far-mirror system is arranged on the adjusting bracket, and the angle of the far-mirror system can be adjusted by the adjusting bracket.
Preferably, the spectral spectroscopic detection system comprises a first detection channel, a second detection channel and a third detection channel, wherein the first detection channel comprises a first dichroic mirror, a first narrow bandwidth optical filter and a first raman spectrometer, the second detection channel comprises a second dichroic mirror, a second narrow bandwidth optical filter and a second raman spectrometer, and the third detection channel comprises a third narrow bandwidth optical filter and a third raman spectrometer; the first Raman spectrometer, the second Raman spectrometer and the third Raman spectrometer are all connected with the central data processing unit;
the first dichroic mirror is positioned on the light path of the emergent light of the optical fiber, the first narrow bandwidth optical filter is positioned on the light path of the reflected light of the first dichroic mirror, and the incident end of the first Raman spectrometer is positioned on the light path of the transmitted light of the first narrow bandwidth optical filter;
the second dichroic mirror is positioned on the transmission light path of the first dichroic mirror, the second narrow bandwidth filter is positioned on the reflection light path of the second dichroic mirror, and the incident end of the second Raman spectrometer is positioned on the transmission light path of the second dichroic mirror;
The third narrow bandwidth filter is positioned on the transmission light path of the second dichroic mirror, and the incidence end of the third Raman spectrometer is positioned on the transmission light path of the third narrow bandwidth filter.
Preferably, the laser is a Nd-YAG laser with a wavelength of 354.7 nm.
Preferably, the secondary mirror is a hyperboloid secondary mirror.
Preferably, the primary mirror of the telescope system is a parabolic mirror and the secondary mirror is located at the focal point of the primary mirror.
Preferably, the expansion factor of the collimation and beam expansion device is 3-5 times.
The utility model has the following beneficial effects:
According to the utility model, the laser light source reflector and the collimation beam expander are arranged in the telescope system, and the collimation beam expander is arranged to enable reflected light of the laser light source reflector to be emitted after being subjected to multiple beam expansion collimation, so that on one hand, the light source diffusion is reduced, the signal to noise ratio of a light source signal is improved, on the other hand, the light beam of the light source is enlarged, the sensitivity of an original light source is further improved, the receiving area of a cloud layer is enlarged, the intensity of a cloud layer reflected signal and the characteristic information of a characteristic spectrum are improved, and further the accuracy of a received signal is improved. In summary, the utility model can improve the intensity of the laser reflected signal, further improve the measurement precision of the atmospheric vapor and realize the high-performance detection of the atmospheric vapor.
Further, an optical fiber is connected to the focal hole of the telescope system, one end of the optical fiber is located at the focal point of the secondary mirror, the other end of the optical fiber is connected with the spectrum spectroscopic detection system, and light focused by the telescope system is transmitted through the optical fiber, so that the relative position between the spectrum spectroscopic detection system and the telescope system is flexible, and the spectrum spectroscopic detection system is not required to be installed at the fixed position of the focal hole of the telescope system, so that the utility model is convenient to carry and assemble.
Further, because the optical fiber is used, the relative position between the spectrum light splitting detection system and the telescope system is flexible, and the adjusting bracket is arranged on the basis, the emission angle of the telescope system can be conveniently adjusted, so that the measuring process is more flexible, and a better detection angle can be conveniently found.
Drawings
FIG. 1 is a schematic diagram of the structure of an atmospheric moisture measurement device based on Raman spectroscopy;
The symbols in the figure: 1-telescope system, 2-laser, 3-laser source reflector, 4-collimation beam expander, 5-optic fibre, 6-spectral detection system, 7-central data processing unit, 101-primary mirror, 102-secondary mirror, 103-focal aperture, 601-first dichroic mirror, 602-first narrow bandwidth filter, 603-first raman spectrometer, 604-second dichroic mirror, 605-second narrow bandwidth filter, 606-second raman spectrometer, 607-third narrow bandwidth filter, 608-third raman spectrometer.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
As shown in fig. 1, the atmospheric vapor measurement device based on raman spectrum of the utility model comprises a telescope system 1, a laser 2, a laser light source reflector 3, a collimation and beam expansion device 4, a central data processing unit 7 and a spectrum light splitting detection system 6 for spectrum detection of laser focused by the telescope system 1, wherein the laser 2 and the spectrum light splitting detection system 6 are both connected with the central data processing unit 7, the laser light source reflector 3 and the collimation and beam expansion device 4 are arranged in the telescope system 1, the laser 2 is arranged on the telescope system 1, the laser light source reflector 3 is arranged between a secondary mirror 102 of the telescope system 1 and a laser incident end of the telescope system 1 and is positioned on an emergent light path of the laser 2, the laser light source reflector 3 can reflect emergent light of the laser 2 out of the laser incident end of the telescope system 1, the collimation and beam expansion device 4 is arranged on a reflected light path of the laser light source reflector 3, the collimation and beam expansion device 4 can expand the reflected light of the laser light source reflector 3 by multiple times, and the collimation device 4 can meet the high detection precision requirement of between 3 times.
In the atmospheric vapor measuring device based on Raman spectrum, laser emitted by a laser 2 is reflected by a laser light source reflector 3 and then passes through a collimation and beam expansion device 4, the collimation and beam expansion device 4 is used for carrying out multiple beam expansion and collimation on the laser, the laser emitted from the telescope system 1 is irradiated on the atmosphere from a signal emission end (the left end of the telescope system 1 in fig. 1), a laser signal emitted from the atmosphere enters the telescope system 1 from the signal emission end of the telescope system 1, a reflected signal entering the telescope system 1 is focused on a focus hole 103 after passing through a primary mirror 101 and a secondary mirror 102, the focused signal at the focus hole 103 is input into a spectrum spectroscopic detection system 6 for spectrum detection, and a central data processing unit 7 can calculate vapor information in the atmosphere according to detection signals of the spectrum spectroscopic detection system 6.
In the utility model, in order to obtain a reflected signal with a high signal-to-noise ratio, a reflected light path of a laser light source reflector 3 is coaxially arranged with a telescope system 1.
In addition, the laser 2 may be mounted as follows: namely, the laser 2 is arranged on the side wall of the telescope system 1, and the side wall of the telescope system 1 is provided with a light passing hole for the emergent light of the laser 2 to pass through.
In order to realize signal transmission, reduce assembly difficulty and improve installation convenience of a pig's thigh device, the utility model carries out signal transmission between a telescope system 1 and a spectrum spectroscopic detection system 6 through an optical fiber 5, and the specific form is as follows: that is, one end of the optical fiber 5 is disposed at the focal point of the secondary mirror, and the other end of the optical fiber 5 is connected to the spectroscopic detection system 6.
In order to conveniently acquire a reflection signal with a better signal-to-noise ratio, the atmosphere vapor measuring device based on the Raman spectrum is further provided with the adjusting bracket, the remote mirror system 1 is arranged on the adjusting bracket, the angle of the remote mirror system 1 can be adjusted by the adjusting bracket, the remote mirror system 1 can be adjusted to an azimuth with higher reflection signal intensity by the adjusting bracket, and further the detection precision is improved.
The spectral spectroscopic detection system 6 of the present utility model may employ a spectral spectroscopic detection system having a structure including a first detection channel including a first dichroic mirror 601, a first narrow bandwidth filter 602, and a first raman spectrometer 603, a second detection channel including a second dichroic mirror 604, a second narrow bandwidth filter 605, and a second raman spectrometer 606, and a third detection channel including a third narrow bandwidth filter 607, and a third raman spectrometer 608; the first Raman spectrometer 603, the second Raman spectrometer 606 and the third Raman spectrometer 608 are all connected with the central data processing unit 7;
The first dichroic mirror 601 is located on the light path of the light emitted by the optical fiber 5, the first narrow bandwidth filter 602 is located on the light path of the light reflected by the first dichroic mirror 601, and the incident end of the first raman spectrometer 603 is located on the light path of the light transmitted by the first narrow bandwidth filter 602;
The second dichroic mirror 604 is located on the transmission light path of the first dichroic mirror 601, the second narrow bandwidth filter 605 is located on the reflection light path of the second dichroic mirror 604, and the incident end of the second raman spectrometer 606 is located on the transmission light path of the second dichroic mirror 604;
The third narrow bandwidth filter 607 is located on the transmission light path of the second dichroic mirror 604, and the incident end of the third raman spectrometer 608 is located on the transmission light path of the third narrow bandwidth filter 607.
In the spectrum spectroscopic detection system 6 with the structure, the first channel collects rice scattering and Rayleigh scattering signals of the atmosphere, the main purpose is to effectively filter out solar background light and stray light, the second channel collects nitrogen echo signals in the atmosphere, vibration Raman scattering signals of the nitrogen are extracted with high efficiency and fineness, and the third channel is the water vapor echo signal collection channel. And finally, inverting the Raman laser data through a central data processing unit to obtain water vapor information.
In the telescope system of the present utility model, the secondary mirror 102 may be a hyperboloid secondary mirror, the primary mirror 101 may be a parabolic mirror, and the secondary mirror 102 is located at the focal point of the primary mirror 101. In the telescope system with the structure, the echo signals reflect light rays through the primary mirror of the parabolic mirror and the secondary mirror of the hyperboloid and pass through the focus hole in the center of the primary mirror, and the design method can enable the length of the lens barrel to be contracted. The secondary mirror is arranged on the optical platform on the transparent optical glass plate of the closed telescope lens cone, so that the scattering effect can be eliminated, and the quality of the acquired signals is higher.
In summary, the atmospheric vapor measurement device of raman spectrum of the utility model adopts the laser as a light source, and transmits the light source into the atmosphere through the reflecting mirror after collimation and beam expansion, the atmospheric echo signal telescope system receives the light source, three channels in the light splitting system respectively measure raman spectrum information in atmospheric echo signals under different wavelengths in the optical fiber coupling spectrum light splitting detection system, and the central data processing unit calculates vapor information in the atmosphere, thereby finally realizing high-performance detection of atmospheric vapor.
Examples
The atmospheric vapor measuring device based on Raman spectrum in the embodiment comprises a telescope system 1, a laser 2, a spectrum spectroscopic detection system 6 and a central data processing unit 7. The telescope system 1 comprises a primary mirror 101, a secondary mirror 102 and a focus hole 103, wherein a laser light source reflector 3 and a collimation beam expander 4 are arranged in the telescope system 1; the telescope system 1 is connected with the spectrum spectroscopic detection system 6 through an optical fiber 5; the spectrum spectral detection system 6 consists of three pairs of detection channels, including a first detection channel dichroic mirror 601, a narrow bandwidth optical filter 602 and a raman spectrometer 603, a second detection channel dichroic mirror 604, a narrow bandwidth optical filter 605 and a raman spectrometer 606, and a third detection channel narrow bandwidth optical filter 607 and a raman spectrometer 608; the laser 2 and the spectrum spectroscopic detection system 6 are both connected with a central data processing unit 7. In actual measurement, laser 2 with 354.7nm output wavelength is taken as a light source, the propagation direction is changed through a laser light source reflector 3, and then the laser is emitted into the atmosphere after being collimated and expanded by 5 times 4, an atmospheric echo signal is received by a telescope system 1 with the caliber of 250mm and the combined focal length of 1m, and is coupled into a spectrum spectroscopic system 6 through an optical fiber 5 with the caliber of 0.8 mm. In the light-splitting system, the scattered signal is reflected by a bicolor mirror 601, and then is received by a Raman spectrometer 603 through a narrow-band filter 602 with the center wavelength of 354.7nm and the bandwidth of 1nm as a meter-Rayleigh detection channel; light transmitted by the dichroic mirror 601 is reflected by the dichroic mirror 604, and then is received by the raman spectrometer 606 as a nitrogen detection channel through a narrow bandwidth filter 605 having a center wavelength of 386.7nm and a bandwidth of 1 nm; while the light transmitted by the dichroic mirror 604 is received by the raman spectrometer 608 as a moisture detection channel via a narrow bandwidth filter 607 having a center wavelength of 407.8nm and a bandwidth of 1 nm. The signals of the three Raman spectrometers are collected by a central data processing unit, and the water vapor information in the atmosphere is calculated through an inversion algorithm.
Claims (10)
1. The utility model provides an atmosphere steam measuring device based on raman spectrum, includes telescope system (1), laser instrument (2), laser light source reflector (3), collimation beam expanding device (4), central data processing unit (7) and is used for carrying out spectral detection's spectral spectroscopy detecting system (6) to the laser of telescope system (1) focus, and laser instrument (2) and spectral spectroscopy detecting system (6) all are connected with central data processing unit (7), its characterized in that:
The laser light source reflector (3) and the collimation beam expander (4) are arranged in the telescope system (1), the laser (2) is arranged on the telescope system (1), the laser light source reflector (3) is arranged between the secondary mirror (102) of the telescope system (1) and the laser incidence end of the telescope system (1) and is positioned on the emergent light path of the laser (2), the laser light source reflector (3) can reflect emergent light of the laser (2) out of the laser incidence end of the telescope system (1), the collimation beam expander (4) is arranged on the reflected light path of the laser light source reflector (3), and the collimation beam expander (4) can emit the reflected light of the laser light source reflector (3) after multiple beam expansion collimation.
2. An atmospheric moisture measurement device based on raman spectroscopy according to claim 1, characterized in that the reflected light path of the laser light source reflector (3) is coaxial with the telescope system (1).
3. The atmospheric vapor measurement device based on Raman spectrum according to claim 1, wherein the laser (2) is arranged on the side wall of the telescope system (1), and a light passing hole for passing the emergent light of the laser (2) is formed on the side wall of the telescope system (1).
4. An atmospheric moisture measuring device based on raman spectroscopy according to claim 1, characterized in that an optical fiber (5) is connected to the focal hole (103) of the telescope system (1), one end of the optical fiber (5) is located at the focal point of the secondary mirror, and the other end of the optical fiber (5) is connected to the spectroscopic detection system (6).
5. An atmospheric moisture measurement device based on raman spectroscopy according to claim 4, further comprising an adjustment bracket on which the remote mirror system (1) is mounted, by means of which the angle of the remote mirror system (1) can be adjusted.
6. The atmospheric moisture measurement device based on raman spectroscopy according to claim 4, wherein the spectroscopic detection system (6) comprises a first detection channel, a second detection channel and a third detection channel, wherein the first detection channel comprises a first dichroic mirror (601), a first narrow bandwidth filter (602) and a first raman spectrometer (603), the second detection channel comprises a second dichroic mirror (604), a second narrow bandwidth filter (605) and a second raman spectrometer (606), and the third detection channel comprises a third narrow bandwidth filter (607) and a third raman spectrometer (608); the first Raman spectrometer (603), the second Raman spectrometer (606) and the third Raman spectrometer (608) are all connected with the central data processing unit (7);
The first dichroic mirror (601) is positioned on a light path of light emitted by the optical fiber (5), the first narrow bandwidth optical filter (602) is positioned on a reflected light path of the first dichroic mirror (601), and an incident end of the first Raman spectrometer (603) is positioned on a light path of light transmitted by the first narrow bandwidth optical filter (602);
The second dichroic mirror (604) is positioned on the transmission light path of the first dichroic mirror (601), the second narrow bandwidth filter (605) is positioned on the reflection light path of the second dichroic mirror (604), and the incidence end of the second raman spectrometer (606) is positioned on the transmission light path of the second dichroic mirror (604);
The third narrow bandwidth filter (607) is positioned on the transmission light path of the second dichroic mirror (604), and the incidence end of the third raman spectrometer (608) is positioned on the transmission light path of the third narrow bandwidth filter (607).
7. An atmospheric moisture measurement device based on raman spectroscopy according to claim 1, characterized in that the laser (2) is a Nd: YAG laser with a wavelength of 354.7 nm.
8. An atmospheric moisture measurement device based on raman spectroscopy according to claim 1, wherein the secondary mirror (102) is a hyperboloid secondary mirror.
9. An atmospheric moisture measurement device based on raman spectroscopy according to claim 1, characterized in that the primary mirror (101) of the telescope system (1) is a parabolic mirror and the secondary mirror (102) is located at the focal point of the primary mirror (101).
10. An atmospheric moisture measurement device based on raman spectroscopy according to claim 1, characterized in that the expansion factor of the collimating and beam expanding means (4) is 3-5 times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322363656.7U CN220854653U (en) | 2023-08-31 | 2023-08-31 | Atmospheric water vapor measuring device based on Raman spectrum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322363656.7U CN220854653U (en) | 2023-08-31 | 2023-08-31 | Atmospheric water vapor measuring device based on Raman spectrum |
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| CN220854653U true CN220854653U (en) | 2024-04-26 |
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| CN202322363656.7U Active CN220854653U (en) | 2023-08-31 | 2023-08-31 | Atmospheric water vapor measuring device based on Raman spectrum |
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- 2023-08-31 CN CN202322363656.7U patent/CN220854653U/en active Active
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