WO2021000359A1 - 一种基于色散选通的大气成分探测激光雷达 - Google Patents
一种基于色散选通的大气成分探测激光雷达 Download PDFInfo
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- WO2021000359A1 WO2021000359A1 PCT/CN2019/096980 CN2019096980W WO2021000359A1 WO 2021000359 A1 WO2021000359 A1 WO 2021000359A1 CN 2019096980 W CN2019096980 W CN 2019096980W WO 2021000359 A1 WO2021000359 A1 WO 2021000359A1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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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
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
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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
- G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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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
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
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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
- G01S7/484—Transmitters
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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
- G01S7/486—Receivers
- G01S7/487—Extracting wanted echo signals, e.g. pulse detection
- G01S7/4876—Extracting wanted echo signals, e.g. pulse detection by removing unwanted signals
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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
Definitions
- the present invention relates to the technical field of laser radar, and more specifically, to a laser radar for detecting atmospheric components based on dispersion gating.
- the detection of atmospheric components plays an important role in climatology, meteorological research, the release of biological and chemical weapons, the prevention of forest fires, and the prevention of air pollution.
- single-point detection techniques include: Differential Optical Absorption Spectroscopy (DOAS), Non-Dispersive Infrared (NDIR), and Optical Cavity Ring-Down Spectroscopy ( Cavity Ring-down Spectroscopy (CRDS), Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (IBBCEAS), Laser-induced Fluorescence (LIF), UV-Visible spectrophotometry (Ultraviolet-visible spectroscopy, referred to as UV-Vis), Tunable Diode Laser Absorption Spectroscopy (abbreviated as TDLAS) and other technologies, although high-precision detection of multiple types of gas components can be achieved, but the gas concentration cannot be obtained Lidar is an effective technical means to obtain the spatial and temporal distribution of high gas concentration.
- DOAS Differential Optical Absorption Spectroscopy
- NDIR Non-Dispersive Infrared
- CRDS Optical Cavity Ring-Down Spectroscopy
- gas detection lidar can be divided into differential absorption lidar, Raman lidar and high spectral resolution lidar.
- the most commonly used differential absorption lidar usually uses two-wavelength lasers.
- One wavelength of the laser has a strong absorption cross-section on the gas to be measured, and the other wavelength laser has a weak absorption cross-section on the gas to be measured. Detecting the ratio of the two laser echo signals can determine the composition of the gas to be measured at different distances.
- differential absorption lidar has realized the detection of gas components such as H 2 O, CO 2 , CO, HCI, NH 3 , NO 2 , SO 2 and O 3 , but the disadvantage of differential absorption lidar is that only a single type can be realized. Gas composition detection.
- the composition information of different gases can be obtained by scanning the spectrum, but its disadvantage is that the wavelength tuning performed by the PZT or the motor causes the wavelength of the emitted laser to be calibrated and locked in real time, and its system structure is complicated .
- the present invention provides an atmospheric composition detection lidar based on dispersion gating.
- the technical solution is as follows:
- the atmospheric component detection lidar includes: femtosecond laser, dispersion gating device, laser pulse amplification device, laser transceiver, atmospheric background noise filter module, detection device, signal Collection device and data processing device;
- the femtosecond laser is used to output femtosecond laser pulses
- the dispersion gating device is used to perform time-domain dispersion on the femtosecond laser pulse, and gating its spectrum in the time domain to output a first target laser pulse of a preset wavelength;
- the laser pulse amplification device is used to amplify the power of the first target laser pulse to form a second target laser pulse;
- the laser transceiver device is used to compress the divergence angle of the second target laser pulse and emit it into the atmosphere, and receive the atmospheric echo signal;
- the atmospheric background noise filtering device is used to perform noise processing on the atmospheric echo signal
- the detection device is used to detect the atmospheric echo signal and output a corresponding electrical signal
- the signal collection device is used to collect the electrical signal
- the data processing device is used to process the electrical signal to obtain concentration information of atmospheric gas components.
- the dispersion gating device includes: a first optical filter, a first intensity modulator, a dispersion device, a pre-laser amplifier, a second optical filter, and a second intensity modulation Device
- the first optical filter is used for filtering the femtosecond laser pulse to select the femtosecond laser within the gas absorption spectrum
- the first intensity modulator is used to reduce the repetition frequency of the femtosecond laser pulse output by the femtosecond laser, so as to increase the effective detection range of the atmospheric component detection lidar;
- the dispersive device is used to disperse the femtosecond laser in the time domain, so as to realize spectrum-to-pulse mapping;
- the pre-laser amplifier is used to amplify the dispersed wide pulse laser to compensate for the loss caused by the filter and the dispersive device;
- the second optical filter is used to shape the spectrum of the wide pulse laser
- the second intensity modulator is used to select a laser pulse of a preset wavelength in the time domain for the shaped wide pulse laser, that is, the first target laser pulse.
- the second optical filter is a programmable optical filter.
- the atmospheric component detection lidar further includes: a parameter optimization device;
- the parameter optimization device is used for optimizing the parameters of the first intensity modulator, the dispersion device and the second intensity modulator, so as to adjust the center wavelength and the spectral width of the gated laser pulse.
- the atmospheric component detection lidar further includes: an adjustment device;
- the adjusting device is used to adjust the delay of the second intensity modulator to realize the scanning of the laser to obtain the absorption spectrum of the gas to be measured and realize the concentration measurement of the gas component.
- the first optical filter is also used to gate the spectrum of the femtosecond laser to realize the detection of different gas components.
- the wavelength of the femtosecond laser is from ultraviolet to infrared.
- the detection device is a single photon detector.
- the laser transceiver includes: a beam expander and an optical telescope;
- the beam expander is used to compress the divergence angle of the second target laser pulse and emit it into the atmosphere;
- the optical telescope is used for receiving atmospheric echo signals.
- the atmospheric component detection lidar stretches the femtosecond laser into a broad pulse laser in the time domain through dispersion.
- the femtosecond spectrum is mapped into the broadened laser pulse due to group velocity dispersion, and is completed by the time domain gating of the intensity modulator.
- the laser wavelength scanning is realized by adjusting the delay of the electric drive signal of the intensity modulator.
- the absorption spectrum of a specific atmospheric component is obtained through laser wavelength scanning, thereby measuring the concentration of atmospheric gas components.
- the atmospheric component detection lidar can accurately select the wavelength of the emitted laser light at will, its wavelength selection has high precision and fast speed, and can realize scanning and detection of multiple gases through the center wavelength of the filter.
- FIG. 1 is a schematic structural diagram of an atmospheric composition detection lidar based on dispersion gating according to an embodiment of the present invention
- FIG. 2 is a schematic structural diagram of another atmospheric component detection lidar based on dispersion gating according to an embodiment of the present invention
- FIG. 3 is a schematic diagram of time-domain and frequency-domain signals at a certain location according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of time domain and frequency domain signals at another location according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of time domain and frequency domain signals at another location provided by an embodiment of the present invention.
- FIG. 6 is a schematic diagram of time domain and frequency domain signals at another location provided by an embodiment of the present invention.
- FIG. 7 is a schematic diagram of time domain and frequency domain signals at another location according to an embodiment of the present invention.
- FIG. 1 is a schematic structural diagram of an atmospheric component detection lidar based on dispersion gating according to an embodiment of the present invention.
- the atmospheric component detection lidar includes: a femtosecond laser 1, a dispersion gating device 2, a laser Pulse amplification device 3, laser transceiver device 4, atmospheric background noise filter module 5, detection device 6, signal acquisition device 7 and data processing device 8;
- the femtosecond laser 1 is used to output femtosecond laser pulses
- the dispersion gating device 2 is used to perform time-domain dispersion on the femtosecond laser pulse and gating the spectrum in the time domain to output a first target laser pulse of a preset wavelength;
- the laser pulse amplifying device 3 is used to amplify the power of the first target laser pulse to form a second target laser pulse;
- the laser transceiver 4 is configured to compress the divergence angle of the second target laser pulse and emit it into the atmosphere, and receive the atmospheric echo signal;
- the atmospheric background noise filtering device 5 is used to perform noise processing on the atmospheric echo signal; (specifically, it is used to filter the background noise of the sun and the background noise of the sky to improve the signal-to-noise ratio of detection).
- the detection device 6 is used to detect the atmospheric echo signal and output corresponding electrical signals
- the signal collection device 7 is used to collect the electrical signal
- the data processing device 8 is used to process the electrical signal to obtain concentration information of atmospheric gas components.
- the atmospheric component detection lidar stretches the femtosecond laser into a broad pulse laser in the time domain through dispersion, and the femtosecond spectrum is mapped into the broadened laser pulse due to group velocity dispersion.
- the selection of the preset wavelength laser is completed, and the laser wavelength scanning is realized by adjusting the delay of the electric drive signal of the intensity modulator.
- the absorption spectrum of a specific atmospheric component is obtained through laser wavelength scanning, thereby measuring the concentration of atmospheric gas components.
- the atmospheric component detection lidar can accurately select the wavelength of the emitted laser light at will, its wavelength selection has high precision and fast speed, and by adjusting the center wavelength of the filter, scanning and detection of multiple gases can be realized.
- the dispersion gating device 2 includes: a first optical filter 21, a first intensity modulator 22, a dispersion device 23, a pre-laser amplifier 24, and a second Two optical filters 25 and a second intensity modulator 26;
- the first optical filter 21 is used for filtering the femtosecond laser pulse to select the femtosecond laser within the gas absorption spectrum;
- the first intensity modulator 22 is used to reduce the repetition frequency of the femtosecond laser pulse output by the femtosecond laser, so as to increase the effective detection range of the atmospheric component detection lidar;
- the dispersive device 23 is used to disperse the femtosecond laser in the time domain, so as to implement spectrum-to-pulse mapping;
- the pre-laser amplifier 24 is used to amplify the dispersed wide pulse laser to compensate for the loss caused by the filter and the dispersive device;
- the second optical filter 25 is used to shape the spectrum of the wide pulse laser
- the second intensity modulator 26 is used to select a laser pulse of a preset wavelength in the time domain for the shaped wide pulse laser, that is, the first target laser pulse.
- the femtosecond laser is stretched into a wide-pulse laser in the time domain by dispersion.
- the wide-pulse laser is gated in the time domain by the intensity modulator, the selection of a specific wavelength laser is completed.
- the center wavelength of the laser The sum bandwidth is determined by the amount of dispersion and the drive signal of the intensity modulator.
- the absorption spectrum of atmospheric gas is measured by scanning the wavelength of the emitted laser, thereby obtaining the concentration of atmospheric gas components. This embodiment can realize precise control of the center wavelength and line width of the emitted laser, thereby measuring the gas absorption spectrum.
- the second optical filter 25 is a programmable optical filter.
- the laser transceiver device 4 includes: a beam expander 41 and an optical telescope 42;
- the beam expander 41 is used to compress the divergence angle of the second target laser pulse and emit it into the atmosphere;
- the optical telescope 42 is used to receive atmospheric echo signals.
- the optical telescope 42 is used to receive the atmospheric echo signal after the laser interacts with the atmosphere.
- FIG. 2 is a schematic structural diagram of another atmospheric component detection lidar based on dispersion gating provided by an embodiment of the present invention, and the atmospheric component detection lidar further includes: Parameter optimization device 9;
- the parameter optimization device 9 is used to optimize the parameters of the first intensity modulator 22, the dispersive device 23, and the second intensity modulator 26 to determine the center wavelength and spectral width of the gated laser pulse. Conduct regulation.
- the atmospheric composition detection lidar further includes: an adjustment device 10;
- the adjusting device 10 is used to adjust the delay of the second intensity modulator 23 to realize the scanning of the laser to obtain the absorption spectrum of the gas to be measured, and to realize the concentration measurement of the gas component.
- the first optical filter 21 is also used for gating the femtosecond laser pulses to achieve detection of different gas components.
- the wavelength of the femtosecond laser 1 ranges from ultraviolet to infrared.
- the detection device 6 is a single photon detector.
- FIG. 3 is a schematic diagram of time domain and frequency domain signals at a certain location according to an embodiment of the present invention.
- FIG 3 it corresponds to the point a in Figure 1 and is located between the first optical filter 21 and the first intensity modulator 22.
- the intensity of the laser pulse in the time domain is reduced, and in the frequency domain, The spectral range of the laser is modulated by the filter to select the wavelength corresponding to the gas absorption spectrum.
- FIG. 4 is a schematic diagram of time domain and frequency domain signals at another location according to an embodiment of the present invention.
- Fig. 4 it corresponds to point b in Fig. 1, and is located between the first intensity modulator 22 and the dispersive device 23. Its spectrum has not changed, but the repetition frequency of the femtosecond laser pulse is reduced, which is beneficial to Long-distance detection of lidar.
- FIG. 5 is a schematic diagram of time domain and frequency domain signals at another location provided by an embodiment of the present invention.
- FIG. 6 is a schematic diagram of time domain and frequency domain signals at another location provided by an embodiment of the present invention.
- the second optical filter 25 can be used to shape the spectrum of the laser pulse to facilitate the detection of the gas absorption spectrum.
- FIG. 7 is a schematic diagram of time domain and frequency domain signals at another location provided by an embodiment of the present invention.
- Fig. 7 it corresponds to the point e in Fig. 1, and is located after the second intensity modulator 26. Because the center wavelength of the pulsed laser is different at different times ( ⁇ 0 , ⁇ 1 . together ⁇ n ), therefore, after being gated in the time domain by the second intensity modulator 26, laser pulses with preset wavelengths can be sequentially selected.
- the modulation speed of intensity modulators is constantly improving, especially the speed of intensity modulators based on lithium niobate can reach tens of GHz. Therefore, as long as the driving input to the intensity modulator is fast enough and the dispersion of the femtosecond pulse is large enough, The laser of the preset wavelength can be selected, and even each single longitudinal mode of the femtosecond laser pulse can be selected.
- the atmospheric component detection lidar stretches the femtosecond laser into a wide pulse laser in the time domain through dispersion. After the wide pulse laser is gated in the time domain by the intensity modulator, it completes the specific wavelength
- the center wavelength and bandwidth of the laser are determined by the amount of dispersion and the drive signal of the intensity modulator, and the scanning of the laser wavelength is realized by adjusting the delay of the electric drive signal of the intensity modulator.
- the absorption spectrum of atmospheric gas is measured by scanning the wavelength of the emitted laser, thereby obtaining the concentration of atmospheric gas components.
- the atmospheric component detection lidar can accurately control the center wavelength and line width of the emitted laser, thereby measuring the gas absorption spectrum.
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Abstract
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Claims (9)
- 一种基于色散选通的大气成分探测激光雷达,其特征在于,所述大气成分探测激光雷达包括:飞秒激光器、色散选通装置、激光脉冲放大装置、激光收发装置、大气背景噪声滤波模块、探测装置、信号采集装置和数据处理装置;其中,所述飞秒激光器用于输出飞秒激光脉冲;所述色散选通装置用于对所述飞秒激光脉冲进行时域色散,并在时域上对其光谱进行选通,以输出预设波长的第一目标激光脉冲;所述激光脉冲放大装置用于对所述第一目标激光脉冲的功率进行放大处理,形成第二目标激光脉冲;所述激光收发装置用于将所述第二目标激光脉冲的发散角进行压缩处理后出射至大气中,并接收大气回波信号;所述大气背景噪声滤波装置用于对所述大气回波信号进行噪声处理;所述探测装置用于探测所述大气回波信号,并输出相应的电信号;所述信号采集装置用于采集所述电信号;所述数据处理装置用于对所述电信号进行处理,以获得大气气体成分的浓度信息。
- 根据权利要求1所述的大气成分探测激光雷达,其特征在于,所述色散选通装置包括:第一光学滤波器、第一强度调制器、色散器件、前置激光放大器、第二光学滤波器和第二强度调制器;其中,所述第一光学滤波器用于对所述飞秒激光脉冲进行滤波处理,以选择位于气体吸收谱内的飞秒激光;所述第一强度调制器用于降低所述飞秒激光器输出的飞秒激光脉冲的重复频率,以提高所述大气成分探测激光雷达的有效探测距离;所述色散器件用于对所述飞秒激光在时域上进行色散,以实现光谱至脉冲的映射;所述前置激光放大器用于对色散后的宽脉冲激光进行放大处理,以补偿所述滤波器和所述色散器件所导致的损耗;所述第二光学滤波器用于对所述宽脉冲激光的光谱进行整形;所述第二强度调制器用于对整形后的宽脉冲激光在时域上选择预设波长的激光脉冲,即所述第一目标激光脉冲。
- 根据权利要求2所述的大气成分探测激光雷达,其特征在于,所述第二光学滤波器为可编程的光学滤波器。
- 根据权利要求2所述的大气成分探测激光雷达,其特征在于,所述大气成分探测激光雷达还包括:参数优化装置;其中,所述参数优化装置用于优化所述第一强度调制器、所述色散器件和所述第二强度调制器的参数,以对选通的激光脉冲的中心波长和光谱宽度进行调控。
- 根据权利要求2所述的大气成分探测激光雷达,其特征在于,所述大气成分探测激光雷达还包括:调节装置;其中,所述调节装置用于调节所述第二强度调制器的延时,实现激光器的扫描,以获得待测气体的吸收谱线,实现气体成分的浓度测量。
- 根据权利要求2所述的大气成分探测激光雷达,其特征在于,所述第一光学滤波器还用于对所述飞秒激光的光谱进行选通,以实现不同气体成分的探测。
- 根据权利要求1所述的大气成分探测激光雷达,其特征在于,所述飞秒激光器的波长为紫外波段至红外波段。
- 根据权利要求1所述的大气成分探测激光雷达,其特征在于,所述探测装置为单光子探测器。
- 根据权利要求1所述的大气成分探测激光雷达,其特征在于,所述激光收发装置包括:扩束器和光学望远镜;其中,所述扩束器用于将所述第二目标激光脉冲的发散角进行压缩处理后出射至大气中;所述光学望远镜用于接收大气回波信号。
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