CN114660573A - Laser radar system for measuring concentration of atmospheric carbon dioxide and methane column - Google Patents
Laser radar system for measuring concentration of atmospheric carbon dioxide and methane column Download PDFInfo
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- CN114660573A CN114660573A CN202210209535.4A CN202210209535A CN114660573A CN 114660573 A CN114660573 A CN 114660573A CN 202210209535 A CN202210209535 A CN 202210209535A CN 114660573 A CN114660573 A CN 114660573A
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
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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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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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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
Abstract
A laser radar system for measuring the concentration of atmospheric carbon dioxide and methane column comprises a 1572nm seed laser, a 1645nm seed laser, a 1572nm laser frequency locking module, a 1645nm laser frequency locking module, dual-wavelength double-pulse lasers (1572 and 1645nm), an integrating sphere, a collimating mirror, a photoelectric detection module, a data acquisition and processing module, a transmitting beam expanding mirror, a visual axis monitoring module, a relay optical module, an optical receiving telescope, a spectroscope I, a spectroscope II and a spectroscope III; the photoelectric detection module comprises a spectroscope IV, a narrow-band filter I, a 1572nm detection optical unit, a 1572nm detector, a narrow-band filter II, an 1645nm detection optical unit and an 1645nm detector. The invention utilizes a set of laser which simultaneously outputs double-wavelength double-pulse laser, adopts a seed injection technology and a high-precision frequency stabilization technology to obtain high-frequency stable laser pulse output, and adopts a path integral differential absorption method to carry out full-time high-precision detection on main greenhouse gases in the atmosphere, namely carbon dioxide and methane.
Description
Technical Field
The invention belongs to laser radars, and particularly relates to a laser radar system for measuring the concentration of atmospheric carbon dioxide and methane columns.
Background
Since the industrial revolution, the content of greenhouse gases such as carbon dioxide and methane in the atmosphere is rapidly increased due to human activities, and the immeasurable influence is caused on the global climate change. Therefore, high-precision monitoring of the concentration of carbon dioxide and methane in the atmosphere at the same time is an essential means for researching the greenhouse effect and making relevant measures.
Currently, there are two main methods for detecting greenhouse gases, active and passive. The passive detection is developed to be mature and can simultaneously invert information of various gases, but the passive detection depends on reflection of sunlight, can not realize night detection and full latitude detection, and is easily interfered by cloud and aerosol. The active laser radar detection method can make up the defects of the passive method, and the path integral differential absorption (IPDA) method adopts two beams of laser with similar wavelengths to be transmitted in sequence in a short time, thereby eliminating the influence of other factors on the path and realizing the high-precision detection of the full latitude all day long.
In recent years, the carbon dioxide differential absorption laser radar technology is developed vigorously, but the technology is often focused on ground detection and low-altitude detection. The main reasons are that long-distance and high-precision gas detection puts higher requirements on the system, such as high energy and high frequency stability of a laser emission system, high sensitivity of a detector and the like. The laser radar for realizing remote detection usually relies on long-time signal accumulation to improve the signal-to-noise ratio, and is not suitable for being applied to a satellite-borne platform moving at a high speed. Therefore, the laser radar capable of realizing airborne and spaceborne long-distance detection has higher cost, but the application space is greatly limited because only one gas concentration can be measured. In the links of fossil fuel development and the like, a portable methane detection device has been widely applied, but the device has low sensitivity and is not suitable for long-distance and large-range detection in the atmosphere.
The path integral differential absorption (IPDA) technology is a key technology suitable for methane and carbon dioxide, can realize high-precision detection all day long and can be suitable for various platforms such as a foundation, a vehicle, an airplane and a satellite, but at present, an IPDA laser radar for simultaneously detecting two gases does not exist.
Disclosure of Invention
The invention aims to solve the problems that a laser radar system can only measure a single gas and the traditional detection equipment is small in application range, short in detection distance and long in integration time, and provides the laser radar system for measuring the concentration of atmospheric carbon dioxide and methane columns.
The technical solution of the invention is as follows:
the utility model provides a measure laser radar system of atmosphere carbon dioxide and methane column concentration which characterized in that: the system comprises a 1572nm seed laser, a 1645nm seed laser, a 1572nm laser frequency locking module, a 1645nm laser frequency locking module, a dual-wavelength double-pulse laser (1572 and 1645nm), an integrating sphere, a collimating mirror, a photoelectric detection module, a data acquisition and processing module, an emission beam expander, a visual axis monitoring module, a relay optical module, an optical receiving telescope, a spectroscope I, a spectroscope II and a spectroscope III; the photoelectric detection module comprises a spectroscope IV, a narrow-band filter I, a 1572nm detection optical unit, a 1572nm detector, a narrow-band filter II, a 1645nm detection optical unit and a 1645nm detector. The positional relationship of the above components is as follows:
the output ports of the 1572nm seed laser, the 1645nm seed laser, the 1572nm laser frequency stabilization module and the 1645nm laser frequency stabilization module are connected with the input port of the dual-wavelength dual-pulse laser, and the 1572nm light beam and the 1645nm light beam emitted by the dual-wavelength dual-pulse laser are divided into two paths by the spectroscope: one path of light enters the photoelectric detection module through the integrating sphere and the collimating mirror, and the other path of light enters the spectroscope and is divided into two paths through the spectroscope II: one path enters the visual axis monitoring module, the other path is emitted into the atmosphere through the transmitting beam expanding lens, optical signals of the path of light beams after being reflected by hard targets such as the ground or cloud layers are divided into two paths through the spectroscope by echo signals of the optical receiving telescope: one path enters the visual axis monitoring module, the other path enters the photoelectric detection module through the relay optical module, and the output end of the photoelectric detection module is connected with the input end of the data acquisition and processing module.
The light beams passing through the integrating sphere and the collimating mirror enter the photoelectric detection module and are incident on the fourth spectroscope, the fourth spectroscope reflects 1572nm light to the first narrow-band filter and the 1572nm detection optical unit and is incident on the 1572nm detector, and meanwhile 1645nm light is transmitted through the fourth spectroscope to enter the second narrow-band filter and the 1645nm detection optical unit and is incident on the 1645nm detector; the hard target reflected echo signal enters the photoelectric detection module through the optical receiving telescope, the third spectroscope and the relay optical module and then enters the fourth spectroscope, the fourth spectroscope transmits 1572nm light in the echo signal and then enters the first narrow-band filter and the 1572nm detection optical units and is incident on the 1572nm detector, and meanwhile 1645nm light is reflected to the second narrow-band filter and the 1645nm detection optical units through the fourth spectroscope and then is incident on the 1645nm detector.
The 1572nm laser frequency locking module and the 1645nm laser frequency locking module are both connected with the input port of the dual-wavelength dual-pulse laser to stabilize the central frequency of the two-wavelength output laser, in particular the frequency stability of online pulse.
The relay optical module is mainly used for converting convergent light received by the optical receiving telescope into parallel light and filtering stray light by using the aperture diaphragm.
The photoelectric detection module comprises a first narrow-band filter and a second narrow-band filter, and is used for filtering the influence of solar background noise and stray light and improving the signal-to-noise ratio.
The visual axis monitoring module comprises a light splitting module and a CCD (charge coupled device) and is used for monitoring an included angle between a transmitting optical axis and a receiving optical axis and ensuring the parallelism of the transmitting optical axis and the receiving optical axis.
The invention has the advantages that:
1. the laser radar system adopts an active detection method, the dual-wavelength double-pulse laser can simultaneously and independently output ONLINE and OFFLINE lasers with 1572nm and 1645nm, the sunlight reflected light is not depended on, the detection can be carried out all the day, corresponding narrow-band filters are arranged in front of detection modules with two wavelengths, the influences of the sunlight background noise and the stray light can be filtered, and the detection precision is improved.
2. The laser radar system not only provides an effective detection method for atmospheric methane concentration with high precision and large range, but also realizes integration with a carbon dioxide detection system, can simultaneously measure two most main greenhouse gases, and better meets the monitoring requirement for controlling greenhouse effect.
3. The laser radar system is suitable for foundation, vehicle-mounted, airborne and satellite-mounted full platforms, can be used for monitoring the emission of local carbon sources and methane sources, and can also be used for overall monitoring of the concentration of atmospheric carbon dioxide and methane in the global range.
4. The laser radar system is provided with the reference light path and used for normalizing the energy of the emitted light beam during inversion calculation, so that the requirement on the energy stability of the laser can be reduced.
5. The laser radar system designed by the invention can simultaneously measure the column concentration of the carbon dioxide and the methane, and because the absorption spectrum line of the methane has a small amount of absorption interference of the carbon dioxide, the system can correct the differential absorption optical thickness of the methane by using the synchronously measured differential absorption optical thickness of the carbon dioxide.
Drawings
Fig. 1 is a block diagram of the overall structure of a lidar system apparatus for measuring atmospheric carbon dioxide and methane column concentrations in accordance with the present invention.
In the figure: the system comprises a 1-1572 nm seed laser, a 2-1645 nm seed laser, a 3-1572 nm laser frequency locking module, a 4-1645 nm laser frequency locking module, a 5-dual-wavelength double-pulse laser, a 6-integrating sphere, a 7-collimating mirror, an 8-photoelectric detection module, a 9-data acquisition and processing module, a 10-transmitting beam expanding mirror, an 11-visual axis monitoring module, a 12-relay optical module, a 13-optical receiving telescope, a 14-spectroscope I, a 15-spectroscope II and a 16-spectroscope III.
Fig. 2 is a block diagram of the structure of the photodetection module according to the present invention.
In the figure: the system comprises an 8-1-spectroscope four, an 8-2-narrow band filter I, an 8-3-1572 nm detection optical unit, an 8-4-1572 nm detector, an 8-5-narrow band filter II, an 8-6-1645 nm detection optical unit and an 8-7-1645 nm detector.
Detailed Description
The invention is further illustrated with reference to the following examples and figures, without thereby limiting the scope of the invention.
Referring to fig. 1, fig. 1 is a block diagram of an overall structure of a laser radar system for measuring atmospheric carbon dioxide and methane column concentrations according to the present invention, and as shown in fig. 1, the laser radar system device for measuring atmospheric carbon dioxide and methane column concentrations according to the present invention includes a 1572nm seed laser 1, a 1645nm seed laser 2, a 1572nm laser frequency locking module 3, a 1645nm laser frequency locking module 4, a dual-wavelength dual-pulse laser (1572 and 1645nm)5, an integrating sphere 6, a collimator lens 7, a photoelectric detection module 8, a data acquisition and processing module 9, a transmitting beam expander 10, a visual axis monitoring module 11, a relay optical module 12, an optical receiving telescope 13, a first spectroscope 14, a second spectroscope 15, and a third spectroscope 16; fig. 2 is a block diagram of a structure of the photodetection module 8 according to the present invention, and as shown in fig. 2, the photodetection module 8 includes a beam splitter four 8-1, a narrow band filter one 8-2, a 1572nm detection optical unit 8-3, a 1572nm detector 8-4, a narrow band filter two 8-5, a 1645nm detection optical unit 8-6, and a 1645nm detector 8-7. The positional relationship of the above components is as follows:
the output ports of the 1572nm seed laser 1, the 1645nm seed laser 2, the 1572nm laser frequency stabilization module 3 and the 1645nm laser frequency stabilization module 4 are connected with the input port of the dual-wavelength dual-pulse laser 5, and the 1572nm light beam and the 1645nm light beam emitted by the dual-wavelength dual-pulse laser 5 are divided into two paths by the first beam splitter 14: one path enters the photoelectric detection module 8 through the integrating sphere 6 and the collimating mirror 7, and the other path is divided into two paths through the spectroscope two 15: get into all the way visual axis monitor module 11, another way is through transmission beam expander 10 jet into the atmosphere, the echo light signal of this way light beam after the reflection of hard targets such as ground or cloud cover warp the optical receiving telescope 13 get into laser radar system in, echo signal warp spectroscope three 16 divide into two the tunnel, get into all the way visual axis monitor module 11, another way warp relay optical module 12 get into photoelectric detection module 8 in, photoelectric detection module 8's output with the data acquisition with process module 9 input link to each other.
In the photodetection module 8, the light beam passing through the integrating sphere 6 and the collimating mirror 7 enters the photodetection module 8, and is incident on the spectroscope four 8-1, the spectroscope four 8-1 reflects the light of 1572nm to the narrow band filter one 8-2 and the detection optical unit 8-3 of 1572nm and is incident on the detector 8-4 of 1572nm, and meanwhile, the light of 1645nm is transmitted through the spectroscope four 8-1, enters the narrow band filter two 8-5 and the detection optical unit 8-6 of 1645nm and is incident on the detector 8-7 of 1645 nm; the echo signal reflected by the hard target enters the photoelectric detection module 8 through the optical receiving telescope 13, the beam splitter three 16 and the relay optical module 12, and then enters the beam splitter four 8-1, the beam splitter four 8-1 transmits 1572nm light in the echo signal, and then enters the narrow band filter one 8-2 and the detecting optical unit 8-3 of 1572nm, and then is incident on the detector 8-4 of 1572nm, and meanwhile 1645nm light is reflected to the narrow band filter two 8-5 and the detecting optical unit 8-6 of 1645nm through the beam splitter four 8-1 and then is incident on the detector 8-7 of 1645 nm.
The following is a specific device employed by way of example:
the optical receiving telescope 13 is a telescope system with parallel transmitting and receiving optical axes; the visual axis monitoring module 11 consists of a light splitting module and a CCD (charge coupled device); the data acquisition and processing module 9 comprises an acquisition card and a data preprocessing module; the 1572nm detector 8-4 and the 1645nm detector 8-7 are APD detectors.
The specific process of the laser radar system for measuring the concentration of the atmospheric carbon dioxide and the methane column is as follows:
after the ONLINE and OFFLINE lasers with wavelengths of 1572nm and 1645nm output by the dual-wavelength dual-pulse laser 5 pass through the integrating sphere 6 and the collimating mirror 7, the ONLINE and OFFLINE lasers enter the photoelectric detection module 8, wherein the lasers with the wavelength of 1572nm pass through the spectroscope IV 8-1, the narrow-band filter I8-2 and the 1572nm detection optical unit 8-3 and then enter the 1572nm detector 8-4 as energy monitoring signals to obtain energy E1on0And E1off0(ii) a Laser with a wave band of 1645nm passes through a spectroscope IV 8-1, passes through a narrow-band filter II 8-5 and a 1645nm detection optical unit 8-6, enters an 1645nm detector 8-7 and serves as an energy detection signal to obtain energy E2on0And E2off0(ii) a The other echo signal reflected by the hard target enters the photoelectric detection module 8 after being received by the optical receiving telescope 13, and enters the two detection modules of 1572nm and 1645nm after passing through the spectroscope IV 8-1, so as to obtain 1572nm online and offfine echo signal energy E1 carrying atmospheric informationonAnd E1offAnd 1645nm online and offline echo signal energy E2onAnd E2offThereby obtaining the differential optical thickness of carbon dioxide
Differential optical thickness of methane
The differential optical thickness carries out multiple groups of accumulation average according to the signal-to-noise ratio requirement, and the accumulation average times are determined by the horizontal resolution and the pulse repetition frequency; the concentration of the carbon dioxide column in the laser path is expressed by IPDA method
The column concentration of methane is expressed as
Where IWF1 is the integral of the weight function of carbon dioxide along the path and IWF2 is the integral of the weight function of methane along the path, IWF1 and IWF2 may be calculated based on the wavelength, the atmospheric aiding parameters, and the measured path.
Experiments show that the invention has the following advantages:
1. the laser radar system adopts an active detection method, the dual-wavelength double-pulse laser can simultaneously and independently output ONLINE and OFFLINE lasers with 1572nm and 1645nm, the sunlight reflected light is not depended on, the detection can be carried out all the day, corresponding narrow-band filters are arranged in front of detection modules with two wavelengths, the influences of the sunlight background noise and the stray light can be filtered, and the detection precision is improved.
2. The laser radar system not only provides an effective detection method for atmospheric methane concentration with high precision and large range, but also realizes integration with a carbon dioxide detection system, can simultaneously measure two most main greenhouse gases, and better meets the monitoring requirement for controlling greenhouse effect.
3. The laser radar system is suitable for foundation, vehicle-mounted, airborne and satellite-mounted full platforms, can be used for monitoring the emission of local carbon sources and methane sources, and can also be used for overall monitoring of the concentration of atmospheric carbon dioxide and methane in the global range.
4. The laser radar system is provided with the reference light path and used for normalizing the energy of the emitted light beam during inversion calculation, so that the requirement on the energy stability of the laser can be reduced.
5. The laser radar system designed by the invention can simultaneously measure the column concentration of carbon dioxide and methane, and because the absorption spectrum line of methane has a small amount of absorption interference of carbon dioxide, the system can correct the differential absorption optical thickness of methane by using the synchronously measured differential absorption optical thickness of carbon dioxide.
Claims (6)
1. A laser radar system for measuring the concentration of atmospheric carbon dioxide and methane columns is characterized by comprising a 1572nm seed laser (1), a 1645nm seed laser (2), a 1572nm laser frequency locking module (3), a 1645nm laser frequency locking module (4), a dual-wavelength double-pulse laser (5), an integrating sphere (6), a collimating mirror (7), a photoelectric detection module (8), a data acquisition and processing module (9), a transmitting beam expander (10), a visual axis monitoring module (11), a relay optical module (12), an optical receiving telescope (13), a spectroscope I (14), a spectroscope II (15) and a spectroscope III (16); the photoelectric detection module (8) comprises a spectroscope IV (8-1), a narrow-band filter I (8-2), a 1572nm detection optical unit (8-3), a 1572nm detector (8-4), a narrow-band filter II (8-5), a 1645nm detection optical unit (8-6) and a 1645nm detector (8-7); the positional relationship of the above components is as follows:
the output ports of the 1572nm seed laser (1), the 1645nm seed laser (2), the 1572nm laser frequency stabilization module (3) and the 1645nm laser frequency stabilization module (4) are connected with the input port of the dual-wavelength dual-pulse laser (5), and the 1572nm light beam and the 1645nm light beam emitted by the dual-wavelength dual-pulse laser (5) are divided into two paths by the first spectroscope (14); one path enters the photoelectric detection module (8) through the integrating sphere (6) and the collimating mirror (7), and the other path is divided into two paths through the spectroscope II (15): one path enters the visual axis monitoring module (11), the other path enters the atmosphere through the transmitting beam expander (10), the optical signal of the path of light beam reflected by hard targets such as the ground or cloud layer enters the laser radar receiving system through the optical receiving telescope (13), and the echo signal is divided into two paths through the spectroscope III (16): one path enters the visual axis monitoring module (11), the other path enters the photoelectric detection module (8) through the relay optical module (12), and the output end of the photoelectric detection module (8) is connected with the input end of the data acquisition and processing module (9);
the light beam passing through the integrating sphere (6) and the collimating mirror (7) enters the photoelectric detection module (8) and is incident to the spectroscope four (8-1), the spectroscope four (8-1) reflects 1572nm light to the narrow-band filter I (8-2) and the 1572nm detection optical unit (8-3) and is incident to the 1572nm detector (8-4), and meanwhile, the spectroscope four (8-1) transmits 1645nm light to the narrow-band filter II (8-5), the 1645nm detection optical unit (8-6) and is incident to the 1645nm detector (8-7); meanwhile, echo signals reflected by the hard target enter the photoelectric detection module (8) through the optical receiving telescope (13), the beam splitter three (16) and the relay optical module (12) and then enter the beam splitter four (8-1), the beam splitter four (8-1) transmits 1572nm light in the echo signals, then enters the narrow-band filter I (8-2) and the 1572nm detection optical unit (8-3) and enters the 1572nm detector (8-4), and meanwhile 1645nm light is reflected to the narrow-band filter II (8-5) and the 1645nm detection optical unit (8-6) through the beam splitter four (8-1) and then enters the 1645nm detector (8-7).
2. The lidar system for measuring atmospheric carbon dioxide and methane column concentration according to claim 1, wherein said device employs a basic method of path integral differential absorption (IPDA), which can simultaneously implement high-precision and long-distance global detection for carbon dioxide gas and methane gas with extremely low concentration in the atmosphere, and the methane detection band is 1645nm band instead of 3 μm band used in the traditional methane detection system, thereby effectively avoiding the problem of signal-to-noise ratio reduction caused by too long atmospheric transmission path and large absorption intensity, and meeting the signal-to-noise ratio requirement of satellite-borne methane detection.
3. The lidar system for measuring atmospheric carbon dioxide and methane column concentration according to claim 1, wherein the dual-wavelength dual-pulse laser (5) is a same laser that can simultaneously output lasers with two wavelengths of 1572nm and 1645nm, and the 1572nm seed laser (1) and the 1645nm seed laser (2) can realize fast online and offfine switching, the seed injection technology ensures that the lasers can realize output with high energy and narrow pulse width in two bands, and the 1572nm and 1645nm band output dual pulses respectively correspond to online and offfine wavelengths of carbon dioxide and methane detection.
4. The lidar system for measuring atmospheric carbon dioxide and methane column concentration according to claim 1, wherein the dual-wavelength dual-pulse laser (5) is controlled by a 1572nm laser frequency locking module (3) and a 1645nm laser frequency locking module (4), so as to ensure that both 1572nm and 1645nm output pulse lights keep stable frequency and are respectively locked at an online band and an offline band.
5. The lidar system for measuring atmospheric carbon dioxide and methane column concentration according to claim 1, wherein the photodetection module (8) comprises a first narrow band filter (8-2) and a second narrow band filter (8-5) for filtering the influence of the background noise and stray light of the sun and improving the signal-to-noise ratio.
6. The lidar system for measuring atmospheric carbon dioxide and methane column concentration of claim 1, wherein the 1645nm band for methane detection, the online laser is located in the absorption groove generated by two absorption lines, which greatly reduces the requirement for the frequency stability of the emitted laser.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290599A (en) * | 2022-10-08 | 2022-11-04 | 青岛镭测创芯科技有限公司 | Laser radar system for measuring concentration of greenhouse gas |
| CN117169855A (en) * | 2023-10-24 | 2023-12-05 | 齐鲁空天信息研究院 | Dual wavelength laser radar device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290599A (en) * | 2022-10-08 | 2022-11-04 | 青岛镭测创芯科技有限公司 | Laser radar system for measuring concentration of greenhouse gas |
| CN115290599B (en) * | 2022-10-08 | 2023-01-24 | 青岛镭测创芯科技有限公司 | Laser radar system for measuring concentration of greenhouse gas |
| CN117169855A (en) * | 2023-10-24 | 2023-12-05 | 齐鲁空天信息研究院 | Dual wavelength laser radar device |
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