An Earth Observation LiDAR for Detection of Trace Gas Column Concentration
A technology of trace gas and lidar, which is applied in the direction of measuring devices, utilization of re-radiation, climate sustainability, etc., can solve the problems of large pulse energy, large resonant cavity size, high peak power, large structural scale and weight, etc., to achieve The effect of thermal control structure and component scale reduction, heat consumption reduction, and size reduction
Active Publication Date: 2019-11-12
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology
[0012] 1. Using pulse Q-switching technology, there is more than 30% Q-switching loss;
[0013] 2. Large pulse energy requires a larger resonant cavity size, larger structure size and weight;
[0014] 3. The peak power is high, and the components are easily damaged;
[0015] 4. Laser crystals must be used to achieve high peak power through light-to-light conversion, with low electro-optic conversion efficiency and high load power consumption;
[0016] 5. Wavelength stability control technology is difficult and expensive
Method used
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[0052] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0053] Such as figure 1 Shown is a schematic diagram of the continuous laser radar system for ground detection. It can be seen from the figure that a ground observation laser radar for trace gas column concentration detection includes a first laser 1, a second laser 2, a receiving telescope 3, an area array The detector 4 and the data processing and inversion module 5; the laser observation radar includes n laser groups; each laser group includes a first laser 1 and a second laser 2 with an angle θ with the first laser 1; n is greater than or equal to A positive integer of 1.
[0054] The first laser 1: emit wavelength λ to the ground off A continuous laser beam of wavelength λ off When the continuous laser beam reaches the ground, it forms λ on the ground off Continuous laser beam spot; λ off After the continuous laser beam spot is diffuse...
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The invention relates to an earth observation laser radar device for trace gas column concentration detection and relates to the laser atmosphere remote sensing field. The radar device comprises a first laser device, a second laser device, a reception telescope, an array detector and a data processing inversion module. An included angle of the second laser device and the first laser device is theta; after the laser emitted by the first laser device and the second laser device reaches the ground, echoes acquired through diffuse reflection by the ground surface still return to the reception telescope along the original optical path and are focused at different pixel positions a and b on the array detector; through inversion processing of a and b detection signals, the trace gas column concentration over the target area can be acquired through inversion according to signals detected by two pixels. The radar device is advantaged in that continuous laser detection is employed, weight, volume, power consumption and cost of the laser devices are effectively reduced, and airborne or satellite column concentration observation of a variety of atmospheric components is further realized.
Description
technical field [0001] The invention relates to the field of laser atmospheric remote sensing, in particular to an earth observation laser radar for detecting trace gas column concentration. Background technique [0002] The current active detection of atmospheric trace gases is mainly based on Raman scattering and differential absorption principles. Among them, the technology related to this project is mainly the differential absorption lidar technology. [0003] At present, the laser radar used to detect the concentration of trace gas column on the ground is mainly the pulse laser radar of the IPDA system. Such lidars typically transmit in double pulses with a time difference of a few hundred microseconds between the two pulses. The operating wavelength of one of the laser pulses is within the absorption spectrum range of target gas molecules, set to λ on . The working wavelength of the other laser pulse is outside the absorption spectrum range of the target gas molecu...
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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 王玉诏罗萍萍
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH