CN115598659B - Single photon methane concentration distribution detection radar - Google Patents
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- CN115598659B CN115598659B CN202211248232.XA CN202211248232A CN115598659B CN 115598659 B CN115598659 B CN 115598659B CN 202211248232 A CN202211248232 A CN 202211248232A CN 115598659 B CN115598659 B CN 115598659B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 228
- 238000001514 detection method Methods 0.000 title claims abstract description 60
- 238000009826 distribution Methods 0.000 title claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000001427 coherent effect Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- 206010034960 Photophobia Diseases 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a single photon methane concentration distribution detection radar. The detection radar includes: the device comprises a laser module, a telescope module, a detector and a controller. The laser module includes a first laser and a second laser. The first laser is used for generating a first laser beam with a wavelength on the methane absorption line. The second laser is used for generating a second laser beam with a wavelength outside the methane absorption line. The telescope module is used for transmitting a pair of differential signals formed by the first laser beam and the second laser beam according to a preset control time sequence into a target area of the atmosphere and receiving corresponding echo signals. The detector is used for generating a detection result according to the received echo signals. The controller is used for measuring the methane concentration in the target area according to the detection result. The detector is a single photon detector. The detection radar has the advantage of high sensitivity, and the detection capability of a large concentration area is improved.
Description
Technical Field
The invention relates to the technical field of methane monitoring, in particular to a single photon methane concentration distribution detection radar.
Background
In terms of environmental protection, methane is taken as a second big greenhouse gas, and the greenhouse effect of each molecule is 72 times of that of carbon dioxide, so that monitoring of methane emission is needed, and currently, methane radar is mainly used for monitoring methane emission. In addition, in terms of living production, the methane radar not only has the advantage of large detection range, but also can acquire concentration information of any region in the detection range, and plays a role in preventing danger and finding leakage sources, which is difficult to replace.
The existing methane radar measurement technology mainly has two main types.
The method can realize a long-distance measurement distance and has higher measurement precision, but does not have distance resolution capability, and can not trace the source of leakage sources in an interval, so that the application of the method is greatly limited.
And secondly, the distance resolution type coherent methane radar emits laser to the atmosphere, the single mode receives a backward reflection signal of aerosol in the atmosphere, interferes with the local oscillation light after frequency shift, and obtains the methane absorption rate in different distance doors by measuring the spectrum power of the interference signal with different time delays, thereby realizing the distance resolution type methane detection. Compared with the path integral methane radar, the method has the advantages that although the measuring distance is shorter and the accuracy is relatively lower, the distance resolution can be realized, and the positioning of the leakage source with the accuracy of tens of meters can be realized, so that the method is more practical in the aspects of large-scale safety early warning and leakage source searching.
However, both of the above approaches have problems of low light sensitivity and small dynamic range. In terms of sensitivity, the conventional photodetector needs an nw-level optical signal to respond, but in the distance-resolved methane radar, the backward scattering probability of the received atmospheric particles is very low, and a laser with very high power and a telescope with very large caliber are needed, so that the cost of the system is high, the volume is large, and the detection distance is limited. In terms of dynamic range, the measurement threshold of the distance-resolved methane radar is about 5000 ppm-m, but when the methane path concentration greatly exceeds the measurement threshold, for example, when the methane path concentration reaches 50000 ppm-m, the signal photon count is greatly reduced due to over-strong absorption and is far lower than the noise photon count, and the radar cannot identify the true magnitude of the methane concentration. In particular, the explosion point of methane in the air is 5% to 16%, and the original methane radar cannot identify whether the methane concentration in the air reaches the explosion point. In addition, in searching for a leakage source, when the methane concentration in a large area exceeds the dynamic range, the positioning capability of the methane radar is also greatly reduced.
Disclosure of Invention
Based on the above, the invention provides a single photon methane concentration distribution detection radar which is necessary to solve the technical problem that the methane laser radar in the prior art has lower sensitivity, so that the detection capability of the methane radar on a large concentration area is limited.
The invention discloses a single photon methane concentration distribution detection radar, which comprises: the device comprises a laser module, a telescope module, a detector and a controller.
The laser module includes a first laser and a second laser. The first laser is used for generating a first laser beam with a wavelength on the methane absorption line. The second laser is used for generating a second laser beam with a wavelength outside the methane absorption line.
The telescope module is used for transmitting a pair of differential signals formed by the first laser beam and the second laser beam according to a preset control time sequence into a target area of the atmosphere and receiving corresponding echo signals.
The detector is used for generating a detection result according to the received echo signals.
The controller is used for measuring the methane concentration in the target area according to the detection result.
The detector is a single photon detector.
As a further improvement of the above-described scheme, the controller is further configured to determine whether the methane concentration is greater than a preset upper methane concentration limit, and when the methane concentration is greater than the upper methane concentration limit, the controller is further configured to increase the measurement range of the methane concentration, and re-measure the methane concentration in the target area under the increased measurement range.
As a further improvement of the above, the controller increases the measurement range of the methane concentration by tuning the wavelength of the first laser beam.
As a further improvement of the above, the controller tunes the wavelength of the first laser beam by controlling the seed current value of the first laser.
As a further improvement of the above-described scheme, the control method of the seed photoelectric value of the first laser is:
(1) The second count n 0 in the furthest gate of the first laser is obtained.
(2) A wavelength average second count a 0 of the first laser beam within the target range gate of the first laser for the current time period is obtained.
(3) A real-time seconds count a t is acquired within the target range gate.
(4) When a t<2n0, the seed photoelectric value of the first laser is controlled to gradually decrease until a t reaches 0.5a 0, and tuning is stopped.
As a further improvement of the above-described scheme, in step (4), the tuning current value at the time of tuning stop is also recorded.
As a further improvement of the above scheme, the single photon detector adopts an indium gallium arsenic single photon detector.
As a further improvement of the above-described scheme, the single-photon methane concentration distribution detection radar further includes: an optical fiber link.
The optical fiber link is used for transmitting laser generated by the laser module into the telescope module and transmitting echo signals received by the telescope module into the detector.
As a further improvement of the above-described scheme, the single-photon methane concentration distribution detection radar further includes: and a time sequence control module.
The time sequence control module is used for uniformly controlling the switch of the laser module, the telescope module, the detector and the controller.
As a further improvement of the above-described scheme, the single-photon methane concentration distribution detection radar further includes: an optical switch module.
The optical switch module is used for switching between the first laser and the second laser according to a preset control time sequence, so that the communication between one of the lasers and the telescope module is realized.
Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:
1. the infrared single-photon detector is used in the detection radar, and the total power of echo signals is at least in the order of nw, which corresponds to 1E10 photons per second, as the conventional range resolution type methane radar using coherent detection is usually required, and the single-photon scheme only needs to detect hundreds of signal photons to obtain methane concentration information of a target space, wherein the total photon number per second is less than 1E6, so that the detection efficiency and the optical efficiency are comprehensively considered, and compared with the detection distance of the conventional methane radar, the single-photon methane concentration distribution detection radar under the same condition is improved by at least 3 times. Therefore, the distance resolution type methane radar adopting the single photon detector not only greatly improves the detection distance and the sensitivity of a radar system, but also reduces the requirements on laser power and caliber of a telescope, reduces the cost and reduces the volume of the laser radar. In addition, in order to ensure the contrast of local heterodyne interference, the traditional methane radar based on coherent detection needs to perform single-mode polarization-maintaining reception on echo signals, and the tolerance of the optical system to environmental influences such as temperature fluctuation is poor. The single photon methane concentration distribution detection radar can adopt a multimode receiving mode, is less susceptible to environmental influence, and greatly improves the popularization and application value of the radar.
2. The detection radar can utilize algorithm optimization when a high concentration area is identified, and the hardware is tuned to the optimal detection wavelength, so that the radar can intelligently increase the range when the methane concentration exceeds the range, the dynamic range of measurement is improved, on one hand, the radar can perform more accurate explosion early warning, on the other hand, the positioning accuracy of a source can be improved under the condition that the concentration of the large area exceeds the standard, and further, the radar has more excellent performance in the aspects of production and life safety and pipeline leakage detection.
Drawings
FIG. 1 is a block diagram of a system of a single photon methane concentration distribution detection radar according to embodiment 1 of the present invention;
FIG. 2 is a graph showing the relationship between the absorption cross section and the wave number of methane molecules in example 1 of the present invention;
FIG. 3 is a flow chart of a method for controlling the seed current value of the first laser in embodiment 1 of the present invention;
FIG. 4 is a flow chart of the method for atmospheric methane detection in example 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that when an element is referred to as being "mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides a single photon methane concentration distribution detection radar, which includes: the single photon detector comprises a laser module, a telescope module, a single photon detector, a controller, an optical fiber link, a time sequence control module, an optical switch module and a filter.
The laser module includes a first laser and a second laser. The first laser is used for generating a first laser beam with a wavelength on the methane absorption line. The second laser is used for generating a second laser beam with a wavelength outside the methane absorption line. In this embodiment, the first laser and the second laser may be named as on and off two wavelength lasers. The light output of the system is switched between on and off wavelengths.
The telescope module is used for transmitting a pair of differential signals formed by the first laser beam and the second laser beam according to a preset control time sequence to a target area of the atmosphere, receiving corresponding echo signals, and transmitting the echo signals to the detector after the echo signals are filtered by the filter.
The detector may be configured to generate a detection result from the received echo signals. The detector can adopt an InGaAs single photon detector, so that the radar has higher detection sensitivity, and compared with a traditional photomultiplier and a coherent detector, the detector has fewer required echo photons, thereby being capable of detecting a longer distance or reducing the requirements on the power of a laser and the caliber of a telescope.
The controller is used for carrying out preliminary tracing on methane leakage in the target area according to a detection result, judging whether the absorption capacity of the target area to the first laser beam reaches a measurement threshold value or not in real time according to an echo signal formed by the first laser, judging whether the methane concentration in the target area is larger than a preset methane concentration upper limit or not according to the measurement threshold value, and when the methane concentration is larger than the upper limit, improving the measurement range of the methane concentration. In the embodiment, the measurement accuracy of the detection radar is 5000 ppm.m; the measurement threshold that triggered the dynamic range adjustment was 50000ppm·m.
Referring to FIG. 2, in the scanning mode, the on laser wavelength is locked on the peak top of the absorption peak of methane R6, at this time, the absorption cross section of methane is about 1.6E-20cm 2/molecule, the distance resolution is set to be 30m, when the methane concentration reaches 150 ppm-m, the optical density of methane with the length of 30m is 0.18, the echo signal can attenuate by about 30% in the interval, the data of 2km measured distance is considered, the estimated effective count is 110/s, the background noise in daytime is about 20/s, the SNR of 10 can be obtained after 1s accumulation, at this time, 30% absorption reaches the measured threshold, the radar can identify the area, and the radar can perform preliminary early warning on the area.
When the methane concentration in the area far exceeds the measurement threshold, for example, when reaching a 10 times measurement threshold, signal photons are absorbed to leave only 3/s, which is far lower than background noise, the actual methane concentration cannot be obtained under the original system, that is, the methane concentration cannot be distinguished to be 1500 ppm-m or 15000 ppm-m or higher.
Referring to fig. 3, when the absorption reaches the measurement threshold, the target area is identified as a high concentration area, and the first laser is controlled to tune, so as to increase the measurement range of the methane concentration. The aforementioned software system will operate as follows:
(1) The second count n 0 in the furthest gate of the first laser is obtained and used as a background noise decision value.
(2) The average second count a 0 of the wavelength of the first laser beam in one target range gate in the current period is acquired as a total count determination value.
(3) A real-time seconds count a t is acquired within the target range gate.
(4) And analyzing the relation between the real-time second count and the background noise judgment value and the total count judgment value. When a t<2n0 is reached, triggering range switching judgment, controlling the seed photoelectric value of the first laser to gradually decrease until a t reaches 0.5a 0, stopping tuning, and recording the tuning current value at the moment.
The optical fiber link is used for transmitting laser generated by the laser module into the telescope module and transmitting echo signals received by the telescope module into the detector.
The time sequence control module is used for uniformly controlling the switches of the laser module, the telescope module, the detector and the controller, so that the orderly work of all the components can be ensured.
The optical switch module is used for switching between the first laser and the second laser according to the instruction sent by the controller, and further realizing the communication between one of the lasers and the telescope module.
In the embodiment, the wavelength of the on laser is located on the methane absorption line, the wavelength of the off laser is outside the methane absorption line, the light emitting of the system is continuously switched between the on wavelength and the off wavelength, and the laser is transmitted to the telescope through the optical fiber link and emitted to the atmosphere; the telescope receives the echo signals and transmits the echo signals to the detector through the optical fiber sprocket, and the detection result of the detector can be input into the software processing system to perform preliminary tracing on methane leakage; after the high concentration area is identified, the controller tunes the laser to a position with lower methane absorption rate, improves the measurement range of methane concentration, and further measures the high concentration area. Therefore, the detection radar can obtain a larger dynamic range of methane detection, when the on wavelength is positioned in a methane absorption peak, the on wavelength is scanned in a large range, after a high-concentration area is detected, a proper measuring range can be selected by utilizing an algorithm, the first laser is tuned to a corresponding position in an absorption spectrum line, and the high-concentration area is further detected.
The method of implementation here in terms of absorption line calibration can be as follows.
The wavelength of the first laser is scanned in advance between 1645.55nm and 1645.37nm in a preset wavelength range, and the power, wavelength and methane absorption cross section at each tuning current are calibrated in advance. When the system enters a working mode, the transmitting power and the methane absorption section under the current tuning current are measured in real time by utilizing a power monitoring module and a methane absorption tank which are arranged in the radar respectively, and the differential absorption signals are normalized according to pre-calibrated data, so that the methane concentration in a target area is calculated. Of course, in other embodiments, the predetermined wavelength range may be set in other ranges as long as it is between 1600nm and 1700nm, and the width is 0.1nm-1 nm.
Therefore, the radar can measure under different wavelengths, the prior methane radar uses fixed wavelengths, and the laser wavelength can be changed through a built-in calibration absorption cell and algorithm, and the methane concentration can be measured under different wavelengths.
Example 2
Referring to fig. 4, the present embodiment provides an atmospheric methane detection method, which can be applied to the single photon methane concentration distribution detection radar in embodiment 1 for detection. The detection method comprises the following steps:
s1, calibrating a methane absorption line.
S2, transmitting a differential signal formed by the first laser beam and the second laser beam to a target area according to the calibrated methane absorption line, and receiving a corresponding echo signal.
S3, generating a detection result according to the echo signal.
S4, measuring the methane concentration in the target area according to the detection result, judging whether the methane concentration is larger than a preset methane concentration upper limit in real time, and executing S5 when the methane concentration is larger than the methane concentration upper limit.
S5, improving the measurement range of the methane concentration, and re-measuring the methane concentration in the target area under the improved measurement range. The method for increasing the measurement range of the methane concentration may be the same as that in example 1, and will not be described here.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (6)
1. A single photon methane concentration profile detection radar, comprising:
A laser module comprising a first laser and a second laser; the first laser is used for generating a first laser beam with the wavelength on the methane absorption line; the second laser is used for generating a second laser beam with the wavelength outside the methane absorption line;
A telescope module for transmitting a pair of differential signals formed by the first laser beam and the second laser beam according to a preset control time sequence into a target area of the atmosphere, and receiving corresponding echo signals;
A detector for generating a detection result from the received echo signal; and
A controller for measuring a methane concentration in the target area based on the detection result;
the detector is characterized by being a single photon detector;
the controller is further configured to determine whether the methane concentration is greater than a preset upper methane concentration limit, and when the methane concentration is greater than the upper methane concentration limit, the controller is further configured to increase a measurement range of the methane concentration to obtain a greater dynamic range of methane detection, and re-measure the methane concentration in the target area under the increased measurement range; the controller increases the measurement range of the methane concentration by tuning the wavelength of the first laser beam; the controller tunes the wavelength of the first laser beam by controlling the seed photoelectric value of the first laser; the control method of the seed photoelectric value of the first laser comprises the following steps:
(1) Acquiring a second count n 0 in a farthest-distance gate of the first laser;
(2) Acquiring a wavelength average second count a 0 of a first laser beam in a target range gate of the first laser in a current time period;
(3) Collecting a real-time second count a t in the target range gate;
(4) When a t<2n0, controlling the seed photoelectric value of the first laser to gradually decrease until a t reaches 0.5a 0, and stopping tuning.
2. The single photon methane concentration distribution detection radar according to claim 1, wherein in step (4), a tuning current value at the time of tuning stop is also recorded.
3. The single photon methane concentration distribution detection radar according to claim 1, wherein the single photon detector is an ingaas single photon detector.
4. The single photon methane concentration distribution detection radar according to claim 1, wherein the detection radar further comprises:
The optical fiber link is used for transmitting laser generated by the laser module into the telescope module and transmitting echo signals received by the telescope module into the detector.
5. The single photon methane concentration distribution detection radar according to claim 1, wherein the detection radar further comprises:
And the time sequence control module is used for uniformly controlling the laser module, the telescope module, the detector and the switch of the controller.
6. The single photon methane concentration distribution detection radar according to claim 1, wherein the detection radar further comprises:
And the optical switch module is used for switching between the first laser and the second laser according to the preset control time sequence, so that the communication between one laser and the telescope module is realized.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044026A (en) * | 2015-08-27 | 2015-11-11 | 安徽中科瀚海光电技术发展有限公司 | Laser methane concentration measuring method based on double-spectrum absorption line and waveform matching |
| CN106769952A (en) * | 2017-03-02 | 2017-05-31 | 南京红露麟激光雷达科技有限公司 | Gas DIAL based on incoherent light source |
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| JPH0315742A (en) * | 1989-03-23 | 1991-01-24 | Anritsu Corp | Gas detector |
| CN107462900B (en) * | 2017-08-02 | 2020-05-15 | 中国科学技术大学 | Gas component detection laser radar based on wavelength tunable laser source |
| CN109239010B (en) * | 2018-09-11 | 2021-07-02 | 杭州春来科技有限公司 | Gas monitoring method based on multispectral spectrum technology |
| CN112180392B (en) * | 2019-07-02 | 2024-05-17 | 中国科学技术大学 | Atmospheric component detection laser radar based on dispersion gating |
| CN111398991B (en) * | 2020-03-03 | 2023-08-01 | 西安理工大学 | Quantum cascade laser differential absorption laser radar VOCs concentration detection method |
| CN112924985B (en) * | 2021-03-16 | 2023-11-17 | 中国科学技术大学 | Mixed laser radar for Mars atmospheric detection |
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| CN105044026A (en) * | 2015-08-27 | 2015-11-11 | 安徽中科瀚海光电技术发展有限公司 | Laser methane concentration measuring method based on double-spectrum absorption line and waveform matching |
| CN106769952A (en) * | 2017-03-02 | 2017-05-31 | 南京红露麟激光雷达科技有限公司 | Gas DIAL based on incoherent light source |
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