CN219320482U - Three-wavelength eight-channel Raman polarization laser radar device - Google Patents
Three-wavelength eight-channel Raman polarization laser radar device Download PDFInfo
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- CN219320482U CN219320482U CN202223222217.6U CN202223222217U CN219320482U CN 219320482 U CN219320482 U CN 219320482U CN 202223222217 U CN202223222217 U CN 202223222217U CN 219320482 U CN219320482 U CN 219320482U
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Abstract
The utility model relates to a laser radar, in particular to a three-wavelength eight-channel Raman polarization laser radar device, which comprises a square cabin, an optical transmitting unit, a receiving and light splitting unit, a data acquisition unit and an information processing unit, wherein the optical transmitting unit, the receiving and light splitting unit, the data acquisition unit and the information processing unit are arranged in the square cabin; the optical emission unit generates laser and emits the laser to the atmosphere through a skylight at the top of the shelter; the receiving and light splitting unit is used for receiving a backward scattering signal generated after the laser enters the atmosphere and performing light splitting treatment; the data acquisition unit is used for carrying out filtering treatment on each path of light and converting the light signals into digital signals; the information processing unit performs inversion based on each path of digital signal to obtain a series of atmospheric parameters; the technical scheme provided by the utility model can effectively overcome the defect that the water vapor, aerosol, particles, sand dust, cloud and the like cannot be effectively observed in an integrated manner in the prior art.
Description
Technical Field
The utility model relates to a laser radar, in particular to a three-wavelength eight-channel Raman polarization laser radar device.
Background
Laser radar (LIDAR, LIght DetectionAnd Ranging) uses laser LIght as a LIght source, the atmosphere is remotely sensed by detecting echo signals generated by the interaction of laser and the atmosphere, and the high-precision distance resolution capability is realized. The interaction between the laser and the atmosphere can generate radiation signals containing information about gas atoms, gas molecules, atmospheric aerosol particles, cloud and the like, and the information about the gas atoms, the gas molecules, the atmospheric aerosol particles, the cloud and the like can be obtained from the radiation signals by using a corresponding inversion method.
The method of multi-wavelength emission and multi-channel detection can integrate multi-parameter observation of water vapor, aerosol (particulate matters, sand dust and the like) and the like. However, existing lidar cannot effectively conduct integrated observation on water vapor, aerosol, particulate matter, sand dust, cloud and the like.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects existing in the prior art, the utility model provides a three-wavelength eight-channel Raman polarization laser radar device, which can effectively overcome the defect that the prior art cannot effectively and integrally observe water vapor, aerosol, particles, sand dust, cloud and the like.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the three-wavelength eight-channel Raman polarization laser radar device comprises a shelter, an optical transmitting unit, a receiving and light splitting unit, a data acquisition unit and an information processing unit, wherein the optical transmitting unit, the receiving and light splitting unit, the data acquisition unit and the information processing unit are arranged in the shelter;
the optical emission unit generates laser and emits the laser to the atmosphere through a skylight at the top of the shelter;
the receiving and light splitting unit is used for receiving a backward scattering signal generated after the laser enters the atmosphere and performing light splitting treatment;
the data acquisition unit is used for carrying out filtering treatment on each path of light and converting the light signals into digital signals;
and the information processing unit is used for carrying out inversion based on each path of digital signal to obtain a series of atmospheric parameters.
Preferably, the optical emission unit includes a YAG laser, a beam expander group, and a mirror group;
YAG laser, which generates laser and divides the laser into three laser beams with three wavelengths through the frequency doubling crystal module and the frequency tripling crystal module;
the beam expander group expands the laser beams with three wavelengths;
and the reflecting mirror group reflects the laser after beam expansion to a skylight at the top of the shelter.
Preferably, a frequency doubling crystal module and a frequency tripling crystal module which divide the emitted laser into three laser beams with wavelengths of 355nm, 532nm and 1064nm are packaged in the YAG laser;
the beam expander group comprises two beam expanders, the reflecting mirror group comprises two first reflecting mirrors arranged on the first two-dimensional adjusting seat, one reflecting mirror corresponds to laser with 355nm wavelength and one beam expander, and the other reflecting mirror corresponds to laser with 532nm wavelength and 1064nm wavelength and the other beam expander.
Preferably, the system further comprises an energy frequency monitoring module, wherein the energy frequency monitoring module feeds back the working state data to the information processing unit in real time while the YAG laser works.
Preferably, the receiving and light splitting unit comprises a telescope, a rear-stage optical assembly and a light splitting assembly;
a telescope for receiving a backward scattering signal generated after the laser enters the atmosphere;
the rear-stage optical assembly is arranged on the side surface of the telescope, adjusts the size of a field of view and collimates divergent optical signals;
and the light splitting assembly is used for splitting the collimated optical signal into eight paths of light.
Preferably, the rear-stage optical assembly comprises an adjustable diaphragm arranged at the light outlet of the telescope and used for adjusting the size of the field of view, and a collimating lens arranged behind the adjustable diaphragm and used for collimating the divergent optical signals.
Preferably, the light splitting assembly includes a first beam splitter, a second beam splitter, a third beam splitter, a fourth beam splitter, a fifth beam splitter, a second reflecting mirror, a first polarizing prism and a second polarizing prism, which are mounted on the second two-dimensional adjusting seat.
Preferably, the data acquisition unit comprises a photoelectric sensor assembly and an acquisition card;
the photoelectric sensor assembly comprises seven first photoelectric sensors consisting of a light filtering assembly and a photomultiplier tube and a second photoelectric sensor consisting of a light filtering assembly and an avalanche photodiode, and eight paths of optical signals are converted into digital signals by using the seven first photoelectric sensors and the second photoelectric sensor;
and the acquisition card is used for receiving the digital signals sent by the first photoelectric sensor and the second photoelectric sensor and sending the digital signals to the information processing unit.
Preferably, the filter assembly comprises a converging lens and a filter, the bandwidth of the filter is smaller than 1nm, and the transmittance is larger than 50%.
Preferably, the information processing unit is an industrial personal computer.
(III) beneficial effects
Compared with the prior art, the three-wavelength eight-channel Raman polarization laser radar device provided by the utility model can emit laser with 355nm, 532nm and 1064nm, and is split into eight paths of light after being split by the receiving and splitting unit, and detection of 355nm-P channel, 355nm-S channel, 386nm channel, 407nm channel, 532nm-P channel, 532nm-S channel, 607nm channel and 1064nm channel is realized after passing through the first photoelectric sensor and the second photoelectric sensor, so that effective integrated observation can be carried out on vapor, aerosol, particles, dust, cloud and the like.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of the beam expander and mirror assembly of FIG. 1 according to the present utility model;
FIG. 3 is a schematic diagram of the structure of the rear stage optical assembly, the beam splitting assembly and the photosensor assembly of FIG. 1 according to the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The three-wavelength eight-channel Raman polarization laser radar device comprises a square cabin 1, an optical transmitting unit, a receiving and light splitting unit, a data acquisition unit and an information processing unit, wherein the optical transmitting unit, the receiving and light splitting unit, the data acquisition unit and the information processing unit are arranged in the square cabin 1;
the optical emission unit generates laser and emits the laser to the atmosphere through a skylight at the top of the shelter 1;
the receiving and light splitting unit is used for receiving a backward scattering signal generated after the laser enters the atmosphere and performing light splitting treatment;
the data acquisition unit is used for carrying out filtering treatment on each path of light and converting the light signals into digital signals;
the information processing unit (the information processing unit is the industrial personal computer 13) performs inversion based on each path of digital signal to obtain a series of atmospheric parameters.
(1) The optical emission unit comprises a YAG laser 4, a beam expander group and a reflector group;
YAG laser 4, which generates laser and divides the laser into three laser beams with three wavelengths through frequency doubling crystal module 5 and frequency tripling crystal module 6;
the beam expander group expands the laser beams with three wavelengths;
and the reflecting mirror group reflects the laser after beam expansion to a skylight at the top of the shelter 1.
The YAG laser 4 is internally packaged with a frequency doubling crystal module 5 and a frequency tripling crystal module 6 which divide the emitted laser into three laser beams with wavelengths of 355nm, 532nm and 1064nm respectively;
the beam expander group comprises two beam expanders 7, and the reflecting mirror group comprises two first reflecting mirrors 10 which are arranged on a first two-dimensional adjusting seat 11, wherein one reflecting mirror 10 corresponds to laser light with 355nm wavelength and one beam expander 7, and the other reflecting mirror 10 corresponds to laser light with 532nm wavelength and 1064nm wavelength and the other beam expander 7.
The YAG laser 4 is a single-pulse laser with the energy being more than 100MJ, the YAG laser 4 is electrically connected with the industrial personal computer 13, and laser emitted by the YAG laser 4 sequentially passes through the frequency doubling crystal module 5, the frequency tripling crystal module 6, the beam expander group and the reflector group and then passes through the skylight to enter the atmosphere. The types of the frequency doubling crystal module 5 and the frequency tripling crystal module 6 are Surelite619-2700 and Surelite 619-2720 respectively; the beam expansion multiple of the beam expander 7 is more than or equal to 3 times, and the light transmission efficiency is more than or equal to 95 percent; the reflectivity of the reflecting mirror 10 to the laser light with the corresponding wavelength is more than 99 percent, and the threshold value is more than 10J/cm 2 。
The energy frequency monitoring module 12 is further included, and the energy frequency monitoring module 12 feeds back working state data to the information processing unit in real time when the YAG laser 4 works, so that the information processing unit can know the working state of the YAG laser 4 in real time.
(2) The receiving and light splitting unit comprises a telescope 8, a rear-stage optical assembly and a light splitting assembly;
a telescope 8 for receiving a back-scattered signal generated after the laser enters the atmosphere;
the rear-stage optical component is arranged on the side surface of the telescope 8, adjusts the size of a field of view and collimates divergent optical signals;
and the light splitting assembly is used for splitting the collimated optical signal into eight paths of light.
The telescope 8 adopts a Newton type reflecting system, has an active heat dissipation function, has the caliber of 300mm, and has the reflectivity of the primary mirror coating film and the secondary mirror coating film of the telescope 8, which are not less than 90% of the laser with the corresponding wavelength of the receiving channel.
The latter optical assembly comprises an adjustable diaphragm 15 arranged at the light outlet of the telescope 8 for adjusting the size of the field of view, and a collimating lens 16 arranged behind the adjustable diaphragm 15 for collimating the divergent light signals.
The beam splitting assembly includes a first beam splitter 17, a second beam splitter 18, a third beam splitter 19, a fourth beam splitter 20, a fifth beam splitter 21, a second reflecting mirror 24, and a first polarizing prism 22 and a second polarizing prism 23, which are mounted on the second two-dimensional adjusting base 14.
(3) The data acquisition unit comprises a photoelectric sensor assembly and an acquisition card 9;
the photoelectric sensor assembly comprises seven first photoelectric sensors consisting of a light filtering assembly 25 and a photomultiplier tube 26, and a second photoelectric sensor consisting of the light filtering assembly 25 and an avalanche photodiode 27, and eight optical signals are converted into digital signals by using the seven first photoelectric sensors and the second photoelectric sensor;
the acquisition card 9 receives the digital signals sent by the first photoelectric sensor and the second photoelectric sensor and sends the digital signals to the information processing unit.
Wherein, the filter assembly 25 comprises a converging lens and a filter, the bandwidth of the filter is less than 1nm, and the transmittance is more than 50%.
The first spectroscope 17 divides the light from the collimating lens 16 into a first path of light and a second path of light, the second path of light reaches the second spectroscope 18 to be divided into a third path of light and a fourth path of light, the third path of light enters a first photoelectric sensor, and the fourth path of light reaches the second reflecting mirror 24 to be reflected to a second photoelectric sensor;
the first light reaches the third spectroscope 19 and is divided into a fifth light and a sixth light, the fifth light reaches the first polarizing prism 22 and is divided into an eleventh light and a twelfth light, and the eleventh light and the twelfth light respectively enter a first photoelectric sensor; the sixth light reaches the fourth spectroscope 20 and is divided into a seventh light and an eighth light, and the seventh light enters a first photoelectric sensor;
the eighth light reaches the fifth spectroscope 21 and is divided into a ninth light and a tenth light, the ninth light enters a first photoelectric sensor, the tenth light reaches the second polarizing prism 23 and is divided into a thirteenth light and a fourteenth light, and the thirteenth light and the fourteenth light enter a first photoelectric sensor respectively;
the first photoelectric sensor and the second photoelectric sensor convert optical signals into digital signals, the digital signals are collected by the collection card 9, then the collection card 9 transmits data to the industrial personal computer 13 for analysis and processing, and inversion is carried out through corresponding algorithms based on each path of digital signals, so that a series of atmospheric parameters are obtained.
Wherein, the light reflectivity of the first spectroscope 17 is more than 95% for 355nm to 532nm and the light transmissivity is more than 93% for 600nm to 1064 nm; the second beam splitter 18 has a light reflectance of more than 95% at 532nm to 607nm and a light transmittance of more than 93% at 660nm to 1064 nm; the third spectroscope 19 has a light transmittance of more than 93% for 532nm and a light reflectance of more than 95% for 355 nm-407 nm; the fourth spectroscope 20 has a light reflectance of more than 95% for 407nm and a light transmittance of more than 93% for 355 nm-386 nm; the fifth spectroscope 21 has a light reflectance of more than 95% at 386nm and a light transmittance of more than 93% at 355 nm; the first polarizing prism 22 is a 532nm polarizing beamsplitter, the second polarizing prism 23 is a 355nm polarizing beamsplitter, and the second mirror 24 is a 1064nm mirror.
The eighth light split by the light splitting assembly means a third light, a fourth light, a seventh light, a ninth light, an eleventh light, a twelfth light, a thirteenth light and a fourteenth light, respectively. The optical channel of the first photoelectric sensor corresponding to the third path of light is a 607nm signal channel, the optical channel of the second photoelectric sensor corresponding to the fourth path of light is a 1064nm channel, the optical channel of the first photoelectric sensor corresponding to the seventh path of light is a 407nm channel, the optical channel of the first photoelectric sensor corresponding to the ninth path of light is a 386nm channel, the optical channel of the first photoelectric sensor corresponding to the eleventh path of light is a 532nm-P channel, the optical channel of the first photoelectric sensor corresponding to the twelfth path of light is a 532nm-S channel, the optical channel of the first photoelectric sensor corresponding to the thirteenth path of light is a 355nm-P channel, and the optical channel of the first photoelectric sensor corresponding to the fourteenth path of light is a 355nm-S channel.
In this technical scheme, the clean defogging device 3 that is used for carrying out clean defogging to the skylight is installed at shelter 1 top, for the transmission of laser with receive and provide the prerequisite, clean defogging area of clean defogging device 3 is 0.5m 2 . The temperature control system 2 is also arranged in the shelter 1, the temperature control system 2 is an air conditioner, and is powered by an external power supply, so that the temperature in the shelter 1 can be controlled, and a stable working environment is provided for the laser radar system.
The shelter 1 adopts heat preservation and insulation material, and the thickness of shelter 1 is 100mm for shelter 1 has better heat preservation effect.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. The three-wavelength eight-channel Raman polarization laser radar device is characterized in that: the system comprises a square cabin (1), an optical transmitting unit, a receiving and light splitting unit, a data acquisition unit and an information processing unit, wherein the optical transmitting unit, the receiving and light splitting unit, the data acquisition unit and the information processing unit are arranged in the square cabin (1);
the optical emission unit generates laser and emits the laser to the atmosphere through a skylight at the top of the shelter (1);
the receiving and light splitting unit is used for receiving a backward scattering signal generated after the laser enters the atmosphere and performing light splitting treatment;
the data acquisition unit is used for carrying out filtering treatment on each path of light and converting the light signals into digital signals;
and the information processing unit is used for carrying out inversion based on each path of digital signal to obtain a series of atmospheric parameters.
2. The three-wavelength eight-channel raman polarized laser radar device according to claim 1, wherein: the optical emission unit comprises a YAG laser (4), a beam expander group and a reflector group;
the YAG laser (4) generates laser and divides the laser into three laser beams with three wavelengths through the frequency doubling crystal module (5) and the frequency tripling crystal module (6);
the beam expander group expands the laser beams with three wavelengths;
and the reflecting mirror group reflects the laser after beam expansion to a skylight at the top of the shelter (1).
3. The three-wavelength eight-channel raman polarized laser radar device according to claim 2, wherein: the YAG laser (4) is internally packaged with a frequency doubling crystal module (5) and a frequency tripling crystal module (6) which divide the emitted laser into three laser beams with wavelengths of 355nm, 532nm and 1064nm respectively;
the beam expander group comprises two beam expanders (7), the reflector group comprises two first reflectors (10) arranged on a first two-dimensional adjusting seat (11), one reflector (10) corresponds to laser light with 355nm wavelength and one beam expander (7), and the other reflector (10) corresponds to laser light with 532nm wavelength and 1064nm wavelength and the other beam expander (7).
4. The three-wavelength eight-channel raman polarized laser radar device according to claim 2, wherein: the YAG laser device also comprises an energy frequency monitoring module (12), wherein the energy frequency monitoring module (12) feeds back working state data to the information processing unit in real time while the YAG laser device (4) works.
5. The three-wavelength eight-channel raman polarized laser radar device according to claim 1, wherein: the receiving and light splitting unit comprises a telescope (8), a rear-stage optical assembly and a light splitting assembly;
a telescope (8) for receiving a backscatter signal generated after the laser beam enters the atmosphere;
the rear-stage optical assembly is arranged on the side face of the telescope (8), adjusts the size of a field of view and collimates divergent optical signals;
and the light splitting assembly is used for splitting the collimated optical signal into eight paths of light.
6. The three-wavelength eight-channel raman polarized laser radar device according to claim 5, wherein: the rear-stage optical assembly comprises an adjustable diaphragm (15) arranged at the light outlet of the telescope (8) and used for adjusting the size of a field of view, and a collimating lens (16) arranged behind the adjustable diaphragm (15) and used for collimating divergent light signals.
7. The three-wavelength eight-channel raman polarized laser radar device according to claim 5, wherein: the light splitting assembly comprises a first spectroscope (17), a second spectroscope (18), a third spectroscope (19), a fourth spectroscope (20), a fifth spectroscope (21), a second reflecting mirror (24), a first polarizing prism (22) and a second polarizing prism (23) which are arranged on the second two-dimensional adjusting seat (14).
8. The three-wavelength eight-channel raman polarized laser radar device according to claim 1, wherein: the data acquisition unit comprises a photoelectric sensor assembly and an acquisition card (9);
the photoelectric sensor assembly comprises seven first photoelectric sensors consisting of a light filtering assembly (25) and a photomultiplier tube (26), and a second photoelectric sensor consisting of the light filtering assembly (25) and an avalanche photodiode (27), and eight paths of optical signals are converted into digital signals by using the seven first photoelectric sensors and the second photoelectric sensor;
and the acquisition card (9) is used for receiving the digital signals sent by the first photoelectric sensor and the second photoelectric sensor and sending the digital signals to the information processing unit.
9. The three wavelength eight channel raman polarized lidar device according to claim 8, wherein: the filter assembly (25) comprises a converging lens and a filter, the bandwidth of the filter is smaller than 1nm, and the transmittance of the filter is larger than 50%.
10. The three-wavelength eight-channel raman polarized lidar device according to claim 1 or 4 or 8, wherein: the information processing unit is an industrial personal computer (13).
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| CN202223222217.6U CN219320482U (en) | 2022-12-02 | 2022-12-02 | Three-wavelength eight-channel Raman polarization laser radar device |
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| CN202223222217.6U CN219320482U (en) | 2022-12-02 | 2022-12-02 | Three-wavelength eight-channel Raman polarization laser radar device |
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