A kind of scanning detection method of ambient gas and lidar
A technology of environmental gas and detection method, which is applied in the field of laser remote sensing, can solve the problems of insufficient quantification of air pollutant emissions, long detection distance, and high temporal and spatial resolution, so as to improve scanning detection accuracy, avoid detection errors, and reduce requirements.
Active Publication Date: 2020-08-28
UNIV OF SCI & TECH OF CHINA
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The existing in-situ measurement observations are not enough to quantify the global atmospheric pollutant emissions. The lidar method is to detect the atmospheric backscattering signal of actively emitting light pulses, which can provide the three-dimensional distribution of atmospheric trace gases. Due to its non-contact detection, With the characteristics of high temporal and spatial resolution and long detection distance, it is an effective means for detecting atmospheric gas components, and can detect areas where in-situ measurement technology cannot be used due to location or safety issues
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[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0057] As mentioned in the background technology, lidar detection can be divided into many methods, among which differential absorption lidar has realized the detection of various gas components in the atmosphere, and differential absorption lidar usually uses two wavelengths of laser light, one of which is in the The absorption cross-section on the gas to be measured is strong, and the absorption cross-section of the laser of another wavelength on the gas to b...
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The invention discloses a scanning detection method for environmental gases and a laser radar. The scanning detection method comprises the following steps: selecting a first frequency point to the Nthfrequency point on a voltage-frequency scanning curve, and selecting a first control voltage to the Nth control voltage corresponding to each frequency point; controlling a wavelength tunable continuous laser to output scanning continuous light according to the ith control voltage, and finely tuning the ith control voltage to lock the frequency of the corresponding scanning continuous light of the ith frequency point; amplifying the scanning pulse light obtained after chopping the scanning continuous optical and then emitting the scanning pulse light to an environment to be detected; collecting gas echo signals of the environment to be detected so as to obtain corresponding gas absorption data from the first frequency point to the Nth frequency point; and determining the concentration distribution information of gases to be detected based on the gas absorption data. The scanning detection of the environment gases is realized through the wavelength tunable continuous laser, so that therequirement of the laser radar for the light source is reduced; and the frequency of the scanning continuous light is locked in the scanning detection process, so that the scanning detection precision is improved.
Description
technical field [0001] The invention relates to the field of laser remote sensing, and more specifically, relates to a method for scanning and detecting ambient gas and a laser radar. Background technique [0002] The detection of atmospheric gas composition is of great significance for the study of climate change and environmental protection. Especially with the rapid development of social economy, the emission of air pollutants has exceeded the carrying capacity of the environment. The existing in-situ measurement observations are not enough to quantify the global atmospheric pollutant emissions. The lidar method is to detect the atmospheric backscattering signal of actively emitting light pulses, which can provide the three-dimensional distribution of atmospheric trace gases. Due to its non-contact detection, With the characteristics of high temporal and spatial resolution and long detection distance, it is an effective means of detecting atmospheric gas components, and ...
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IPC IPC(8): G01N21/39G01S17/88
CPCG01N21/39G01S17/88
Inventor 夏海云余赛芬岳斌上官明佳章振窦贤康
Owner UNIV OF SCI & TECH OF CHINA
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