Multiple shaft differential optical absorption spectrometry method and apparatus for detecting vertical distribution of atmospheric composition

Abstract

The invention discloses a multiaxis differential spectrum absorbing method and device for vertically distribution detection of atmospheric components. Wherein, a plurality of telescopes are arranged to observe the space from the ground in different angles of pitch, so as to detect and collect sun lights scattered by the atmosphere; the surfaces of the telescopes' lens cones are blackened to reduce stray light, the scattered sun light is converged at the ends of optic fibers after passing the lens and light filters in the telescopes; the optic fibers at the tail ends of the telescopes are combined and guide the scattered sun lights into the incident slit of an imaging spectrometer, which first disperses the scattered sun lights, and then concentrate them on a photosensitive surface of a face array imaging CCD detector; the spectral signals go through data analysis and treatment after A/D conversion and inputting into a computer. The invention is applicable for chemical research of atmosphere, provides input data and model verification for chemical model of atmosphere; and is applicable for verifying the results of atmospheric components detected by a satellite.

Description

technical field [0001] The invention belongs to an optical remote control method and device, in particular to a multi-axis differential absorption spectrum measurement method and device for vertical distribution detection of atmospheric components. Background technique [0002] The vertical distribution of air pollution components (such as NO2, SO2, HCHO, etc.) is very important for mastering the spatial distribution, transportation and evolution process of polluted gases. At present, the measurement methods for the vertical distribution of polluted gases mainly include: 1) adopt the method of establishing observation towers, and place point-type gas monitors (such as NO2 monitors) on different heights of the established observation towers to realize the measurement of different heights. Observation of the concentration of gas components to obtain the vertical distribution of the gas. But the main problem is that the observable height depends on the height of the observatio...

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Problems solved by technology

But the main problem is that the observable height depends on the height of the observation tower (generally preferably only more than 300 meters), and requires multiple gas monitors with different components, and the instruments still need to be calibrated regularly

2) Differential absorption lidar is used for detection. Differential absorption lidar can generally detect the vertical distribution of gas at a height of 3-5km. The main disadvantage is that the limited wavelength of the current laser limits the types of gases that can be detected, and the price is expensive. Difficult to realize automatic measurement, complex operation

3) The sounding balloon (or airship) uses the rising process of the balloon to detect, it is only a one-time observation and cannot be used for long-term observation

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