CN219871763U - Ozone laser radar transmitting system - Google Patents
Ozone laser radar transmitting system Download PDFInfo
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- CN219871763U CN219871763U CN202320449380.1U CN202320449380U CN219871763U CN 219871763 U CN219871763 U CN 219871763U CN 202320449380 U CN202320449380 U CN 202320449380U CN 219871763 U CN219871763 U CN 219871763U
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- ozone
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 36
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 230000010287 polarization Effects 0.000 claims abstract description 11
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 17
- 239000010935 stainless steel Substances 0.000 claims description 17
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims description 7
- 229910052805 deuterium Inorganic materials 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000005437 stratosphere Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000005436 troposphere Substances 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Optical Radar Systems And Details Thereof (AREA)
Abstract
The utility model relates to the technical field of laser radars, in particular to an ozone laser radar transmitting system, which comprises a laser, a harmonic beam splitting assembly, a Raman tube and a broadband reflecting mirror assembly which are sequentially arranged according to an optical path, inert gases with different air pressures are filled in the Raman tube, an isolator is arranged between the laser and the Raman tube, and the isolator comprises a polarization beam splitting sheet and a quarter wave plate which are sequentially arranged according to the transmitting optical path. The utility model has the advantages that: the problem of damage to the laser due to return light can be effectively solved.
Description
Technical Field
The utility model relates to the technical field of laser radars, in particular to an ozone laser radar transmitting system.
Background
The laser radar uses laser as a light source, and the atmosphere is remotely sensed by detecting a radiation signal of interaction of the laser and the atmosphere, so that an atmosphere component parameter profile is inverted in real time. Ozone is one of important trace components in the earth's atmosphere, and the average content is about 10-100ppb (volume ratio), and most of ozone is concentrated in the stratosphere of 10-30km, and the ozone content in the stratosphere is only about 10%. Ozone in the troposphere is mainly a natural source and is obviously characterized by absorbing most of ultraviolet bands in the solar spectrum, so that animals and plants on the ground are protected from being damaged by ultraviolet radiation; ozone in the troposphere, especially in the boundary layer, is mainly an artificial source, and due to the strong oxidation property, high concentration ozone can directly and seriously harm human health, animal and plant growth and ecological environment, and form photochemical smog pollution, SO that the ozone has become one of six main atmospheric pollutants (PM 2.5, PM10, SO2, NO2, CO and O3) which are mainly monitored by the national environmental protection department.
The emitting unit of the ozone laser radar consists of an emitting light source and an emitting light path. According to the measurement requirement, a ND-YAG solid-state laser is selected as a laser source. The laser can generate a laser beam with high energy 266nm wavelength, the laser beam is used as pumping energy, the pumping Raman tube is excited to generate two ozone differential absorption wavelengths of 289nm and 316nm, and the two ozone differential absorption wavelengths are emitted into the atmosphere through a broadband reflector to generate absorption effect with gas to be measured. Inert gases with different air pressures are filled into the Raman tube, so that the Raman excitation efficiency of 289nm and 316nm wave bands can be directly influenced, and the overall performance of laser radar detection is improved.
Since a focusing lens is required to focus a laser light source in a raman tube when exciting a raman gas. Therefore, a back light phenomenon is easily generated on the plano-convex lenses at both ends of the raman tube. The wavelength of the externally added laser is ultraviolet band, single photon energy is high, and the laser is easy to be damaged by return light.
Disclosure of Invention
In order to solve the technical problems, the utility model provides an ozone laser radar transmitting system, which comprises the following specific technical scheme:
the utility model provides an ozone laser radar transmitting system, includes laser instrument, harmonic beam splitting subassembly, raman pipe, the broadband reflector subassembly that sets gradually according to the light path, be filled with the inert gas of different atmospheric pressures in the Raman pipe, be provided with the isolator between laser instrument and the Raman pipe, the isolator includes polarization beam splitting piece and the quarter wave plate that sets gradually according to the emission light path.
Specifically, the separator is set at an angle to the optical path deflection.
Specifically, the set angle is 3 ° or less.
Specifically, the angle of the quarter wave plate is adjustable.
Specifically, a reflecting mirror component for turning the light path to a set angle is arranged between the harmonic beam splitting component and the Raman tube.
Specifically, the mirror assembly includes a first mirror and a second mirror disposed in sequence along an optical path.
Specifically, the raman tube comprises a stainless steel tube, a first plano-convex lens, a second plano-convex lens, a first flange and a second flange, wherein the first plano-convex lens, the second plano-convex lens, the first flange and the second flange are arranged in the stainless steel tube, and the first plano-convex lens and the second plano-convex lens are fixed at two ends of the stainless steel tube through the corresponding first flange and the second flange respectively, so that two ends of the stainless steel tube are sealed.
Specifically, the Raman tube further comprises a digital display integrated pressure gauge, wherein the digital display integrated pressure gauge is arranged in the stainless steel tube, and the position of the digital display integrated pressure gauge avoids the light path between the first plano-convex lens and the second plano-convex lens.
Specifically, the Raman tube is filled with 0.6-0.7Mpa deuterium gas.
Specifically, the harmonic beam splitting assembly comprises a first harmonic beam splitter and a second harmonic beam splitter which are sequentially arranged according to an optical path.
The utility model has the advantages that:
(1) The polarization beam splitting plate ensures that a 266nm linearly polarized laser beam is efficiently transmitted or reflected; the angle of the quarter wave plate is adjustable, so that the linearly polarized laser beam with 266nm is maximally transmitted or reflected and then rotated for 45 degrees, and then Nd: linearly polarized light emitted by the YAG fixed laser is converted into circularly polarized light; when the laser beam is influenced by the subsequent light path to generate return light, the return light passes through the quarter wave plate, and then circularly polarized light is converted into linearly polarized light perpendicular to the polarization state of the original linearly polarized light, so that the problem that the laser is damaged by the return light can be effectively solved.
(2) The deflection angle range cannot be larger than 3 degrees, so that the transmittance of the optical lens is ensured on the basis of not damaging the laser.
(3) The reflecting mirror component comprises a first reflecting mirror and a second reflecting mirror which are 266nm high-reflecting lenses, so that the volume of the emitting system is effectively reduced.
Drawings
Fig. 1 is a block diagram of an ozone lidar transmission system.
Fig. 2 is a schematic diagram of the isolator of fig. 1 isolating reflected light.
Fig. 3 is a schematic structural diagram of a raman tube.
In the figure:
1. a laser; 21. a first harmonic beam splitter; 22. a second harmonic beam splitter; 31. a polarizing beam splitter; 32. a quarter wave plate; 41. a first mirror; 42. a second mirror; 5. a Raman tube; 51. stainless steel tube; 52. a first plano-convex lens; 53. a first flange; 54. a second flange; 55. a second plano-convex lens; 56. a digital display integrated pressure gauge; 61. a first broadband mirror; 62. a second broadband mirror; 63. and a third broadband mirror.
Detailed Description
As shown in fig. 1, an ozone laser radar transmitting system comprises a laser 1, a harmonic beam splitter component, an isolator, a reflecting mirror component, a raman tube and a broadband reflecting mirror component which are sequentially arranged according to a light outgoing light path, and each component is described in detail below.
The laser 1 is Nd: YAG fixed laser 1, nd: the YAG fixed laser 1 is used for emitting linearly polarized laser beams with the wavelengths of 1064nm, 532nm and 266 nm;
the harmonic beam splitter component is used for separating laser beam harmonic waves with different wavelengths and reflecting linearly polarized laser beams with the wavelength of 266 nm; in this version, the harmonic beam splitter assembly includes a first harmonic beam splitter 21 and a second harmonic beam splitter 22.
The isolator includes a polarization beam splitter 31 and a quarter wave plate 32 arranged in order according to the optical path; the polarization beam splitter 31 ensures that the polarized light laser beam with the wavelength of 266nm emitted by the laser 1 is efficiently transmitted (P light) or reflected (S light); the angle of the quarter wave plate 32 is adjustable, so that the polarized laser beam with the wavelength of 266nm is maximally transmitted or reflected and then rotated by 45 degrees, and the linearly polarized light emitted by the laser 1 is converted into circularly polarized light; once the laser beam is affected by the subsequent optical path to generate return light, the circularly polarized light is converted into linearly polarized light perpendicular to the polarization state of the original linearly polarized light after passing through the quarter wave plate 32. When passing through the polarization beam splitter 31, the original transmitted light is changed into reflected light (the original reflected light can be changed into transmitted light), so that the original light path direction is changed, and the laser 1 is prevented from being damaged by return light. Optimally, the polarizing beam splitter 31 and the quarter wave plate 32 need to be optical lenses with higher damage resistance threshold, as shown in fig. 2, after passing through the polarizing beam splitter 31 and the quarter wave plate 32 in turn, the linearly polarized light P (indicated by the direction line with the transverse line) returns to form circularly polarized light (indicated by the direction line with the ellipse), and then the original direction of the light beam passing through the quarter wave plate 32 and the polarizing beam splitter 31 is changed to linearly polarized light S, and the direction is the direction with black dots in the figure. The polarization beam splitter 31 is a high-power laser polarization beam splitter. In order to prevent the light reflected by the polarizing beam splitter 31 and the quarter wave plate 32 from damaging the laser 1, the isolator should be set at the time of installation according to the actual light path deflection. In order to ensure the transmittance of the optical lens, the deflection angle range cannot be more than 3 degrees.
The reflector assembly comprises a first reflector 41 and a second reflector 42 which are 266nm high-reflection lenses, so that the volume of the emission system is effectively reduced.
As shown in fig. 3, the raman tube 5 includes a stainless steel tube 51, a first plano-convex lens 52, a second plano-convex lens 55, a first flange 53, a second flange 54, and a digital display integrated pressure gauge 56 disposed in the stainless steel tube 51, wherein the first plano-convex lens 52 and the second plano-convex lens 55 are fixed at two end positions in the stainless steel tube 51 by the corresponding first flange 53 and second flange 54, respectively, and the digital display integrated pressure gauge 56 is disposed in the tube of the stainless steel tube 51 and cannot block the optical path in the tube. Specifically, the stainless steel tube 51 is a 316 stainless steel tube 51 having a diameter of 28mm, a wall thickness of 2mm, and a length of 1m, and the focal lengths of the first plano-convex lens 52 and the second plano-convex lens 55 are 500mm. The stainless steel pipe 51 is filled with gas to form a gas pool having a certain pressure. The first plano-convex lens 52 and the second plano-convex lens 55 provide optical path support for the raman reaction of the gas Chi Jifa after laser light is incident. The first flange 53 and the second flange 54 are used for fixing two ends of the raman tube 5 and forming a gas seal. The digital display integrated pressure gauge 56 is mainly used for controlling and displaying the gas pressure. The Raman tube 5 is filled with gases with different air pressures, and the Raman excites 289nm and 316nm lasers, particularly, the conversion efficiency of 289nm in the range of deuterium gas is highest.
The broadband mirror assembly comprises a first broadband mirror 61, a second broadband mirror 62, a third broadband mirror 63 arranged in the emission path, and emits laser beams with wavelengths 266nm, 289nm, 316nm to the atmosphere by reflection. The broadband reflector component is used for changing the light path, and is convenient for product adjustment.
In order to obtain experimental data, the light beams with the wavelengths of 289nm and 316nm excited by the ozone laser radar emission system are split by a color separation film at the rear end of the system, gas with different air pressures is filled into the Raman tube 5, and the change of energy of each wave band of 289nm and 316nm along with the air pressure of deuterium is recorded by utilizing instruments such as a spectrometer, an energy meter and the like.
Specifically, the raman tube 5 of the present utility model is filled with deuterium gas, and the change of raman conversion efficiency of each band of 289nm and 316nm with the gas pressure is shown in fig. 3. From the figure it is concluded that: when the deuterium gas pressure in the gas pool is less than 1.5MPa, the Raman conversion efficiency of 289nm wave band is higher than that of 316nm wave band, and especially when the deuterium gas pressure is less than 1MPa, the Raman conversion efficiency of 289nm wave band is obviously higher than that of 316nm wave band.
The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the present utility model, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. The utility model provides an ozone laser radar transmitting system, includes laser instrument (1), harmonic beam splitting subassembly, raman pipe (5) that set gradually according to the light path, broadband reflection mirror subassembly, be filled with the inert gas of different atmospheric pressures in Raman pipe (5), its characterized in that is provided with the isolator between laser instrument (1) and Raman pipe (5), the isolator includes polarization beam splitting piece (31) and quarter wave plate (32) that set gradually according to the emission light path.
2. An ozone lidar emission system as claimed in claim 1, wherein the isolator is set at an angle to the optical path deflection.
3. An ozone lidar emission system as claimed in claim 2, wherein the set angle is 3 ° or less.
4. An ozone lidar emission system as claimed in claim 1, characterized in that the angle of the quarter wave plate (32) is adjustable.
5. An ozone lidar emission system according to claim 1, characterized in that a mirror assembly is arranged between the harmonic beam splitting assembly and the raman tube (5) for turning the beam path to a set angle.
6. An ozone lidar emission system according to claim 5, characterized in that the mirror assembly comprises a first mirror (41) and a second mirror (42) arranged in the order of the optical path.
7. An ozone lidar emission system according to claim 1, characterized in that the raman tube (5) comprises a stainless steel tube (51) and a first plano-convex lens (52), a second plano-convex lens (55), a first flange (53) and a second flange (54) which are arranged in the stainless steel tube (51), and the first plano-convex lens (52) and the second plano-convex lens (55) are fixed at two end positions in the stainless steel tube (51) through the corresponding first flange (53) and second flange (54) respectively, so that two ends of the stainless steel tube (51) are sealed.
8. An ozone lidar emission system according to claim 7, characterized in that the raman tube (5) further comprises a digital integrated pressure gauge (56), the digital integrated pressure gauge (56) being arranged in the tube of the stainless steel tube (51) and being positioned to avoid the optical path between the first plano-convex lens (52) and the second plano-convex lens (55).
9. An ozone lidar emission system as claimed in claim 7, characterized in that the raman tube (5) is filled with 0.6-0.7Mpa deuterium gas.
10. An ozone lidar emission system as claimed in claim 7, characterized in that the harmonic beam splitting assembly comprises a first harmonic beam splitter (21) and a second harmonic beam splitter (22) arranged in sequence in the optical path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320449380.1U CN219871763U (en) | 2023-03-10 | 2023-03-10 | Ozone laser radar transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320449380.1U CN219871763U (en) | 2023-03-10 | 2023-03-10 | Ozone laser radar transmitting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219871763U true CN219871763U (en) | 2023-10-20 |
Family
ID=88337392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320449380.1U Active CN219871763U (en) | 2023-03-10 | 2023-03-10 | Ozone laser radar transmitting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219871763U (en) |
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2023
- 2023-03-10 CN CN202320449380.1U patent/CN219871763U/en active Active
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