CN107796742B - Device for calibrating atmospheric component concentration detection laser radar - Google Patents
Device for calibrating atmospheric component concentration detection laser radar Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
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- 238000000180 cavity ring-down spectroscopy Methods 0.000 claims abstract description 14
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Abstract
The invention relates to a device for calibrating atmospheric constituent concentration detection laser radar, which comprises: the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool; the standard gas cell includes: the laser comprises a plurality of groups of plane reflecting mirrors and a tunable semiconductor laser, wherein the tunable semiconductor laser is perpendicular to the plane reflecting mirrors. Still another apparatus is directed, the apparatus comprising: the device includes: the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool; the standard gas cell includes: multiple sets of plane mirrors and cavity ring-down CRDS, wherein the cavity ring-down CRDS is perpendicular to the multiple sets of plane mirrors. The device of the invention greatly reduces the occupied space of the calibration device and the consumption of the standard gas, greatly shortens the necessary light beam transmission space distance, greatly reduces the requirement standard for standard gas inflation in the cell, and can more accurately obtain the gas concentration in the cell.
Description
Technical Field
The invention belongs to the field of atmospheric concentration detection by radar, and particularly relates to a device for calibrating atmospheric component concentration detection laser radar.
Background
The existing common detection of the concentration of the atmospheric components is performed by a laser radar detection method, which is to perform remote detection on the concentration of the atmospheric components in the region where laser light arrives by recovering and analyzing the wavelength, frequency, polarization and the like of the backward scattering light of the emitted laser light passing through the gas molecules in the atmospheric space. Thus, the aircrafts such as airplanes, hot air balloons, kites and the like are not needed to go to the detection point for sampling during measurement. In particular, in the detection of high-altitude atmosphere which is difficult to reach by a general aircraft, the laser radar detection method has incomparable advantages, but the detection accuracy and precision of the laser radar are very low.
In order to improve the detection accuracy and precision of the laser radar, the laser radar needs to be calibrated. A more direct calibration method is to use radar detection and a radiosonde (or aircraft-borne sampling analysis) to simultaneously detect a certain point in space and compare the measurement results. However, since the concentrations of the components in the natural atmospheric space do not normally vary greatly, this method usually calibrates only one concentration point or a few concentration points with small differences. Another more common calibration method, often referred to as self-calibration, calibrates critical component parameters in the lidar by monitoring means. Self-calibration avoids the problem of calibration only to a certain concentration measurement point, but not to the whole laser radar system. If measurement errors (or even errors) occur on components that are not being monitored and calibrated, large measurement deviations or even errors can result. In 2014, the physical laboratory (NPL) in the united kingdom combines the two ideas, and manually establishes a large-scale gas pool and a gas generating device to generate a gas area with known concentration so as to calibrate the laser radar. The method has not been reported in public for a while. Although the method can effectively avoid the problems of the former two methods, the calibration system is not only bulky (the system occupies more than 10 square meters) and is not easy to move, but also needs to be placed outside the measurement blind area (different from radar types, the measurement blind area is different from dozens of meters to thousands of meters) of the laser radar when the laser radar is calibrated, so that the selection of the calibration place is difficult. In addition, the manually discharged standard gas used in the calibration system can only be directly discharged into the atmosphere, so that the consumption of the standard gas in a single calibration is large, and secondary pollution to the atmosphere is easily caused. Therefore, the frequency with which the NPL uses the system is low. This results in that, between two calibrations for a longer time interval, if the unmonitored components of the radar system deviate significantly, the measurement results of the radar will also deviate significantly.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the calibration system used in the prior art has the problems of large volume, difficulty in selecting calibration places, large consumption of standard gas in single calibration, easy secondary pollution to atmosphere, and large deviation of measurement results due to deviation in a radar system.
To solve the above technical problems, the present invention provides an apparatus for calibrating an atmospheric constituent concentration detection lidar, the apparatus comprising: the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool; the standard gas cell includes: the laser comprises a plurality of groups of plane reflecting mirrors and tunable semiconductor lasers, wherein the tunable semiconductor lasers are perpendicular to the plane reflecting mirrors; the ports of the standard gas pool and the laser beam form a certain inclination angle, the ports of the optical fibers and the laser beam form a certain inclination angle, and the optical fibers are large-numerical-aperture optical fibers;
the laser beam processing module, the optical fiber and the collimating lens are sequentially arranged on the same optical axis;
the laser radar is used for emitting a first laser beam;
the first laser beam is processed by the laser beam processing module, the optical fiber and the collimating lens in sequence and then emitted to the standard gas pool;
the standard gas pool is used for processing the processed first laser beam again by utilizing the performance of multi-pass reflection and laser spectrum absorption of the tunable diode to obtain a second laser beam;
after the second laser beam is emitted from the standard gas pool, the second laser beam is processed by the collimating lens, the optical fiber and the laser beam processing module along the original path in sequence and then fed back to the laser radar;
the laser radar is further used for analyzing the second laser beam processed by the laser beam processing module, judging whether a difference value between an analysis result and a preset standard gas is within an error allowable range, and if so, the laser radar measurement result is accurate.
The invention has the beneficial effects that: through foretell device, calibration device's occupation of land space and the consumption to the standard gas have significantly reduced, and first laser beam is handled through big numerical value optic fibre, by a wide margin burden shortens necessary light beam transmission space distance, and the incidence and the exit window of optic fibre terminal surface (including incident end and exit end) and standard gas pond all adopt the inclination design, prevent backscattering laser injury photoelectric detector in the laser radar, increase tunable semiconductor laser in the standard gas pond in addition, greatly reduced is to the gas filled requirement standard of standard gas in the pond, and can obtain the gas concentration in the gas pond more accurately, thereby detect the correction situation of radar more accurately.
Further, the laser beam processing module is specifically configured to perform focusing processing on the first laser beam;
the optical fiber is specifically used for adjusting the divergence angle of the focused first laser beam;
the collimating lens is specifically configured to collimate the first laser beam whose divergence angle is adjusted by the optical fiber and emit the collimated first laser beam to the standard gas cell.
Further, the standard gas cell is specifically configured to output the second laser beam to the collimating lens;
the collimating lens is specifically used for collimating the second laser beam reflected by the standard gas cell;
the optical fiber is specifically used for adjusting the divergence angle of the second laser beam collimated by the collimating lens;
the laser beam processing module is specifically configured to process the second laser beam whose divergence angle is adjusted by the optical fiber, and output the second laser beam to the laser radar.
Further, the laser beam processing module includes: the device comprises a focusing lens, a plane reflecting mirror and a concave mirror, wherein the distance between the plane reflecting mirror and the concave mirror is less than 1 meter;
the optical axes of the focusing lens, the plane reflecting mirror and the concave mirror are on the same straight line, and the first laser beam is emitted to the optical fiber after being processed by the focusing lens, the plane reflecting mirror and the concave mirror in sequence;
and the second laser beam is emitted from the optical fiber, is subjected to scattering processing by the concave mirror, and is output to the laser radar.
The method has the beneficial effects that: the optical fiber is adjusted to greatly shorten the necessary light beam transmission space distance.
Further, the focusing lens is specifically configured to focus the first laser beam;
the plane mirror is specifically configured to emit the focused first laser beam to the central hole of the concave mirror through the central hole thereof, so as to enter the inlet of the optical fiber through the central hole of the concave mirror.
The invention also relates to a device for calibrating an atmospheric constituent concentration detection lidar, the device comprising:
the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool;
the standard gas cell includes: a plurality of sets of planar mirrors and cavity ring-downs CRDS, wherein the cavity ring-downs CRDS are perpendicular to the plurality of sets of planar mirrors; the ports of the standard gas pool and the laser beam form a certain inclination angle, the ports of the optical fibers and the laser beam form a certain inclination angle, and the optical fibers are large-numerical-aperture optical fibers;
the laser beam processing module, the optical fiber and the collimating lens are sequentially arranged on the same optical axis;
the laser radar is used for emitting a first laser beam;
the first laser beam is processed by the laser beam processing module, the optical fiber and the collimating lens in sequence and then emitted to the standard gas pool;
the standard gas pool is used for processing the processed first laser beam again by utilizing the performance of multi-pass reflection and laser spectrum absorption of the tunable diode to obtain a second laser beam;
after the second laser beam is emitted from the standard gas pool, the second laser beam is processed by the collimating lens, the optical fiber and the laser beam processing module along the original path in sequence and then fed back to the laser radar;
the laser radar is further used for analyzing the second laser beam processed by the laser beam processing module, judging whether a difference value between an analysis result and a preset standard gas is within an error allowable range, and if so, the laser radar measurement result is accurate.
The invention has the beneficial effects that: through foretell device, calibration device's occupation of land space and to the consumption of standard gas have significantly reduced, and the incidence and the exit window of optic fibre terminal surface (containing incident end and exit end) and standard gas pond all adopt the inclination design, prevent backscattering laser injury photoelectric detector in the laser radar, increase optical cavity ring-down ware CRDS in the standard gas pond in addition, reduce the requirement standard to the interior standard gas inflation of pond, and can realize the current most accurate gas concentration detection precision in the world, thereby detect the correction situation of radar more accurately.
Further, the laser beam processing module is specifically configured to perform focusing processing on the first laser beam;
the optical fiber is specifically used for adjusting the divergence angle of the focused first laser beam;
the collimating lens is specifically configured to collimate the first laser beam whose divergence angle is adjusted by the optical fiber and emit the collimated first laser beam to the standard gas cell.
Further, the standard gas cell is specifically configured to output the second laser beam to the collimating lens;
the collimating lens is specifically used for collimating the second laser beam reflected by the standard gas cell;
the optical fiber is specifically used for adjusting the divergence angle of the second laser beam collimated by the collimating lens;
the laser beam processing module is specifically configured to process the second laser beam whose divergence angle is adjusted by the optical fiber, and output the second laser beam to the laser radar.
The method has the beneficial effects that: the optical fiber is adjusted to greatly shorten the necessary light beam transmission space distance.
Further, the laser beam processing module includes: the device comprises a focusing lens, a plane reflecting mirror and a concave mirror, wherein the distance between the plane reflecting mirror and the concave mirror is less than 1 meter;
the optical axes of the focusing lens, the plane reflecting mirror and the concave mirror are on the same straight line, and the first laser beam is emitted to the optical fiber after being processed by the focusing lens, the plane reflecting mirror and the concave mirror in sequence;
and the second laser beam is emitted from the optical fiber, is subjected to scattering processing by the concave mirror, and is output to the laser radar.
Further, the focusing lens is specifically configured to focus the first laser beam;
the plane mirror is specifically configured to emit the focused first laser beam to the central hole of the concave mirror through the central hole thereof, so as to enter the inlet of the optical fiber through the central hole of the concave mirror.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for calibrating an atmospheric constituent concentration detection lidar in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for calibrating an atmospheric constituent concentration detection lidar according to another embodiment of the invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides an apparatus for calibrating an atmospheric constituent concentration detection lidar, the apparatus including:
the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool; the standard gas cell includes: the laser comprises a plurality of groups of plane reflecting mirrors and tunable semiconductor lasers, wherein the tunable semiconductor lasers are perpendicular to the plane reflecting mirrors; the ports of the standard gas pool and the laser beam form a certain inclination angle, the ports of the optical fibers and the laser beam form a certain inclination angle, and the optical fibers are large-numerical-aperture optical fibers;
the laser beam processing module, the optical fiber and the collimating lens are sequentially arranged on the same optical axis;
the laser radar is used for emitting a first laser beam;
the first laser beam is processed by the laser beam processing module, the optical fiber and the collimating lens in sequence and then emitted to the standard gas pool;
the standard gas pool is used for processing the processed first laser beam again by utilizing the performance of multi-pass reflection and laser spectrum absorption of the tunable diode to obtain a second laser beam;
after the second laser beam is emitted from the standard gas pool, the second laser beam is processed by the collimating lens, the optical fiber and the laser beam processing module along the original path in sequence and then fed back to the laser radar;
the laser radar is further used for analyzing the second laser beam processed by the laser beam processing module, judging whether a difference value between an analysis result and a preset standard gas is within an error allowable range, and if so, the laser radar measurement result is accurate.
It should be noted that, in this embodiment, a laser beam for detection is emitted from a laser radar, a first laser beam is focused by a center hole of a focusing lens and then emitted to a plane mirror, and then emitted to an optical fiber port through the center hole of the plane mirror, where the length of an optical fiber may be several meters to several kilometers as required, and then emitted from the optical fiber port, enters a collimating lens for collimation and then enters a standard gas cell, the first laser beam is processed in the standard gas cell to obtain a second laser beam, the second laser beam is emitted along an original entrance, emitted into the collimating lens, and then emitted to the optical fiber port through the collimating lens, and after being processed by a concave mirror or a convex lens, the second laser beam is emitted into the laser radar. Because the standard gas pool is filled with standard gas with known components and the concentrations of the components, when laser passes through the standard gas pool, backscattering of laser photons by molecules in the gas pool returns to the output end of the original optical fiber along the original path and is transmitted to the original input end in the optical fiber for output. In this case, the divergence angle of the output second laser beam is determined by the numerical aperture inherent to the optical fiber. In addition, in this application the standard gas cell comprises: the laser comprises a plurality of groups of plane reflecting mirrors and a tunable semiconductor laser, wherein the tunable semiconductor laser is vertical to the plane reflecting mirrors; the tunable semiconductor laser is added, so that the TDLAS technology and the multi-pass reflection can be used simultaneously, the requirement standard for standard gas inflation in the cell is greatly reduced, and the gas concentration in the gas cell can be obtained more accurately.
In this embodiment, a large numerical aperture fiber is used, where the output beam from the output end of the fiber will have an output cone angle of α ≈ 13 °, and where the spatial transmission distance between the two is about 0.25 meters to expand the beam to a radius ω
I.e., the distance between the plane mirror M1 and the concave mirror M2 is less than 1 meter.
The backward scattered light after beam expansion and collimation is received by a receiving telescope of the laser radar and transmitted to a photoelectric detector for processing, and then the concentration value of the gas in the standard gas pool detected by the photoelectric detector is obtained. The value is compared with the known standard gas concentration value, so that the measurement uncertainty of the laser radar can be obtained, and the calibration of the laser radar is realized. Through the standard gas inlet and the standard gas outlet of the standard gas pool, the concentration and the components of gas in the standard gas pool can be changed, and the calibration or the calibration of the laser radar for detecting various gases is realized.
The optical elements in the whole system are plated with a broadband (200nm-3600nm) antireflection or high-reflection film for laser. The standard gas cell is gas tight and maintains its concentration constant for a measurement period (typically 1 day to 1 week) when filled with the standard gas. For gas such as ozone which is easy to decompose, the concentration of the gas in the gas pool is ensured to be constant in the measuring time period by adopting a circulating flow mode.
Optionally, in another embodiment, the laser beam processing module is specifically configured to focus the first laser beam;
the optical fiber is specifically used for adjusting the divergence angle of the focused first laser beam;
the collimating lens is specifically configured to collimate the first laser beam whose divergence angle is adjusted by the optical fiber and emit the collimated first laser beam to the standard gas cell.
Optionally, in another embodiment, the standard gas cell is specifically configured to output the second laser beam to the collimating lens;
the collimating lens is specifically used for collimating the second laser beam reflected by the standard gas cell;
the optical fiber is specifically used for adjusting the divergence angle of the second laser beam collimated by the collimating lens;
the laser beam processing module is specifically configured to process the second laser beam whose divergence angle is adjusted by the optical fiber, and output the second laser beam to the laser radar.
In the present embodiment, the adjustment of the optical fiber greatly shortens the necessary beam transmission space distance.
Optionally, in another embodiment the laser beam processing module comprises: the device comprises a focusing lens, a plane reflecting mirror and a concave mirror, wherein the distance between the plane reflecting mirror and the concave mirror is less than 1 meter;
the optical axes of the focusing lens, the plane reflecting mirror and the concave mirror are on the same straight line, and the first laser beam is emitted to the optical fiber after being processed by the focusing lens, the plane reflecting mirror and the concave mirror in sequence;
and the second laser beam is emitted from the optical fiber, is subjected to scattering processing by the concave mirror, and is output to the laser radar.
Optionally, in another embodiment, the focusing lens is specifically configured to focus the first laser beam;
the plane mirror is specifically configured to emit the focused first laser beam to the central hole of the concave mirror through the central hole thereof, so as to enter the inlet of the optical fiber through the central hole of the concave mirror.
As shown in fig. 2, an embodiment of the present invention further relates to an apparatus for calibrating an atmospheric constituent concentration detection lidar, the apparatus comprising:
the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool;
the standard gas cell includes: a plurality of sets of planar mirrors and cavity ring-downs CRDS, wherein the cavity ring-downs CRDS are perpendicular to the plurality of sets of planar mirrors; the ports of the standard gas pool and the laser beam form a certain inclination angle, and the ports of the optical fiber and the laser beam form a certain inclination angle;
the laser beam processing module, the optical fiber and the collimating lens are sequentially arranged on the same optical axis;
the laser radar is used for emitting a first laser beam;
the first laser beam is processed by the laser beam processing module, the optical fiber and the collimating lens in sequence and then emitted to the standard gas pool;
the standard gas pool is used for processing the processed first laser beam again by utilizing the performance of multi-pass reflection and laser spectrum absorption of the tunable diode to obtain a second laser beam;
after the second laser beam is emitted from the standard gas pool, the second laser beam is processed by the collimating lens, the optical fiber and the laser beam processing module along the original path in sequence and then fed back to the laser radar;
the laser radar is further used for analyzing the second laser beam processed by the laser beam processing module, judging whether a difference value between an analysis result and a preset standard gas is within an error allowable range, and if so, the laser radar measurement result is accurate.
It should be noted that, in this embodiment, a laser beam for detection is emitted from a laser radar, a first laser beam is focused by a center hole of a focusing lens and then emitted to a plane mirror, and then emitted to an optical fiber port through the center hole of the plane mirror, where the length of an optical fiber may be several meters to several kilometers as required, and then emitted from the optical fiber port, enters a collimating lens for collimation and then enters a standard gas cell, the first laser beam is processed in the standard gas cell to obtain a second laser beam, the second laser beam is emitted along an original entrance, emitted into the collimating lens, and then emitted to the optical fiber port through the collimating lens, and after being processed by a concave mirror or a convex lens, the second laser beam is emitted into the laser radar. Because the standard gas pool is filled with standard gas with known components and the concentrations of the components, when laser passes through the standard gas pool, backscattering of laser photons by molecules in the gas pool returns to the output end of the original optical fiber along the original path and is transmitted to the original input end in the optical fiber for output. In this case, the divergence angle of the output second laser beam is determined by the numerical aperture inherent to the optical fiber. In addition, the standard gas cell includes: a plurality of sets of planar mirrors and cavity ring-down CRDS, wherein the cavity ring-down CRDS is perpendicular to the plurality of sets of planar mirrors; a cavity ring-down CRDS is added so that the CRDS technique is used with multi-pass reflection. The requirement standard for standard gas inflation in the pool is reduced, and the internationally existing most accurate gas concentration detection precision can be realized.
In this embodiment, a large numerical aperture fiber is used, where the output beam from the output end of the fiber will have an output cone angle of α ≈ 13 °, and where the spatial transmission distance between the two is about 0.25 meters to expand the beam to a radius ω
I.e., the distance between the plane mirror M1 and the concave mirror M2 is less than 1 meter.
The backward scattered light after beam expansion and collimation is received by a receiving telescope of the laser radar and transmitted to a photoelectric detector for processing, and then the concentration value of the gas in the standard gas pool detected by the photoelectric detector is obtained. The value is compared with the known standard gas concentration value, so that the measurement uncertainty of the laser radar can be obtained, and the calibration of the laser radar is realized. Through the standard gas inlet and the standard gas outlet of the standard gas pool, the concentration and the components of gas in the standard gas pool can be changed, and the calibration or the calibration of the laser radar for detecting various gases is realized.
The optical elements in the whole system are plated with a broadband (200nm-3600nm) antireflection or high-reflection film for laser. The standard gas cell is gas tight and maintains its concentration constant for a measurement period (typically 1 day to 1 week) when filled with the standard gas. For gas such as ozone which is easy to decompose, the concentration of the gas in the gas pool is ensured to be constant in the measuring time period by adopting a circulating flow mode.
Through foretell device, calibration device's occupation of land space and to the consumption of standard gas have significantly reduced, and the incidence and the exit window of optic fibre terminal surface (containing incident end and exit end) and standard gas pond all adopt the inclination design, prevent backscattering laser injury photoelectric detector in the laser radar, increase optical cavity ring-down ware CRDS in the standard gas pond in addition, reduce the requirement standard to the interior standard gas inflation of pond, and can realize the current most accurate gas concentration detection precision in the world, thereby detect the correction situation of radar more accurately.
Optionally, in another embodiment, the laser beam processing module is specifically configured to focus the first laser beam;
the optical fiber is specifically used for adjusting the divergence angle of the focused first laser beam;
the collimating lens is specifically configured to collimate the first laser beam whose divergence angle is adjusted by the optical fiber and emit the collimated first laser beam to the standard gas cell.
Optionally, in another embodiment, the standard gas cell is specifically configured to output the second laser beam to the collimating lens;
the collimating lens is specifically used for collimating the second laser beam reflected by the standard gas cell;
the optical fiber is specifically used for adjusting the divergence angle of the second laser beam collimated by the collimating lens;
the laser beam processing module is specifically configured to process the second laser beam whose divergence angle is adjusted by the optical fiber, and output the second laser beam to the laser radar.
In the present embodiment, the adjustment of the optical fiber greatly shortens the necessary beam transmission space distance.
Optionally, in another embodiment the laser beam processing module comprises: the device comprises a focusing lens, a plane reflecting mirror and a concave mirror, wherein the distance between the plane reflecting mirror and the concave mirror is less than 1 meter;
the optical axes of the focusing lens, the plane reflecting mirror and the concave mirror are on the same straight line, and the first laser beam is emitted to the optical fiber after being processed by the focusing lens, the plane reflecting mirror and the concave mirror in sequence;
and the second laser beam is emitted from the optical fiber, is subjected to scattering processing by the concave mirror, and is output to the laser radar.
Optionally, in another embodiment, the focusing lens is specifically configured to focus the first laser beam;
the plane mirror is specifically configured to emit the focused first laser beam to the central hole of the concave mirror through the central hole thereof, so as to enter the inlet of the optical fiber through the central hole of the concave mirror.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An apparatus for calibrating an atmospheric constituent concentration detection lidar, the apparatus comprising:
the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool; the standard gas cell includes: the laser comprises a plurality of groups of plane reflecting mirrors and tunable semiconductor lasers, wherein the tunable semiconductor lasers are perpendicular to the plane reflecting mirrors; the ports of the standard gas pool and the laser beam form a certain inclination angle, the ports of the optical fibers and the laser beam form a certain inclination angle, and the optical fibers are large-numerical-aperture optical fibers;
the laser beam processing module, the optical fiber and the collimating lens are sequentially arranged on the same optical axis;
the laser radar is used for emitting a first laser beam;
the first laser beam is processed by the laser beam processing module, the optical fiber and the collimating lens in sequence and then emitted to the standard gas pool;
the standard gas pool is used for processing the processed first laser beam again by utilizing the performance of multi-pass reflection and laser spectrum absorption of the tunable diode to obtain a second laser beam;
after the second laser beam is emitted from the standard gas pool, the second laser beam is processed by the collimating lens, the optical fiber and the laser beam processing module along the original path in sequence and then fed back to the laser radar;
the laser radar is further used for analyzing the second laser beam processed by the laser beam processing module, judging whether a difference value between an analysis result and a preset standard gas is within an error allowable range, and if so, the laser radar measurement result is accurate.
2. The apparatus of claim 1,
the laser beam processing module is specifically used for focusing the first laser beam;
the optical fiber is specifically used for adjusting the divergence angle of the focused first laser beam;
the collimating lens is specifically configured to collimate the first laser beam whose divergence angle is adjusted by the optical fiber and emit the collimated first laser beam to the standard gas cell.
3. The apparatus of claim 1,
the standard gas cell is specifically used for outputting the second laser beam to the collimating lens;
the collimating lens is specifically used for collimating the second laser beam reflected by the standard gas cell;
the optical fiber is specifically used for adjusting the divergence angle of the second laser beam collimated by the collimating lens;
the laser beam processing module is specifically configured to process the second laser beam whose divergence angle is adjusted by the optical fiber, and output the second laser beam to the laser radar.
4. The apparatus of any of claims 1-3, wherein the laser beam processing module comprises: the device comprises a focusing lens, a plane reflecting mirror and a concave mirror, wherein the distance between the plane reflecting mirror and the concave mirror is less than 1 meter;
the optical axes of the focusing lens, the plane reflecting mirror and the concave mirror are on the same straight line, and the first laser beam is emitted to the optical fiber after being processed by the focusing lens, the plane reflecting mirror and the concave mirror in sequence;
and the second laser beam is emitted from the optical fiber, is subjected to scattering processing by the concave mirror, and is output to the laser radar.
5. The apparatus of claim 4,
the focusing lens is specifically used for focusing the first laser beam;
the plane mirror is specifically configured to emit the focused first laser beam to the central hole of the concave mirror through the central hole thereof, so as to enter the inlet of the optical fiber through the central hole of the concave mirror.
6. An apparatus for calibrating an atmospheric constituent concentration detection lidar, the apparatus comprising:
the device comprises a laser radar, a laser beam processing module, an optical fiber, a collimating lens and a standard gas pool;
the standard gas cell includes: a plurality of sets of planar mirrors and cavity ring-downs CRDS, wherein the cavity ring-downs CRDS are perpendicular to the plurality of sets of planar mirrors; the ports of the standard gas pool and the laser beam form a certain inclination angle, the ports of the optical fibers and the laser beam form a certain inclination angle, and the optical fibers are large-numerical-aperture optical fibers;
the laser beam processing module, the optical fiber and the collimating lens are sequentially arranged on the same optical axis;
the laser radar is used for emitting a first laser beam;
the first laser beam is processed by the laser beam processing module, the optical fiber and the collimating lens in sequence and then emitted to the standard gas pool;
the standard gas pool is used for processing the processed first laser beam again by utilizing the performance of multi-pass reflection and laser spectrum absorption of the tunable diode to obtain a second laser beam;
after the second laser beam is emitted from the standard gas pool, the second laser beam is processed by the collimating lens, the optical fiber and the laser beam processing module along the original path in sequence and then fed back to the laser radar;
the laser radar is further used for analyzing the second laser beam processed by the laser beam processing module, judging whether a difference value between an analysis result and a preset standard gas is within an error allowable range, and if so, the laser radar measurement result is accurate.
7. The device according to claim 6, characterized in that the laser beam processing module is in particular adapted to focus the first laser beam;
the optical fiber is specifically used for adjusting the divergence angle of the focused first laser beam;
the collimating lens is specifically configured to collimate the first laser beam whose divergence angle is adjusted by the optical fiber and emit the collimated first laser beam to the standard gas cell.
8. The apparatus according to claim 6, characterized in that the standard gas cell, in particular for outputting the second laser beam to the collimator lens;
the collimating lens is specifically used for collimating the second laser beam reflected by the standard gas cell;
the optical fiber is specifically used for adjusting the divergence angle of the second laser beam collimated by the collimating lens;
the laser beam processing module is specifically configured to process the second laser beam whose divergence angle is adjusted by the optical fiber, and output the second laser beam to the laser radar.
9. The apparatus according to any one of claims 6-8, wherein the laser beam processing module comprises: the device comprises a focusing lens, a plane reflecting mirror and a concave mirror, wherein the distance between the plane reflecting mirror and the concave mirror is less than 1 meter;
the optical axes of the focusing lens, the plane reflecting mirror and the concave mirror are on the same straight line, and the first laser beam is emitted to the optical fiber after being processed by the focusing lens, the plane reflecting mirror and the concave mirror in sequence;
and the second laser beam is emitted from the optical fiber, is subjected to scattering processing by the concave mirror, and is output to the laser radar.
10. The apparatus of claim 9,
the focusing lens is specifically used for focusing the first laser beam;
the plane mirror is specifically configured to emit the focused first laser beam to the central hole of the concave mirror through the central hole thereof, so as to enter the inlet of the optical fiber through the central hole of the concave mirror.
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| CN116930936B (en) * | 2023-09-19 | 2024-05-03 | 长春汽车工业高等专科学校 | Laser radar calibrator |
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