Cavity enhanced absorption spectrum device and method for simultaneous measurement of trace gas concentration and aerosol extinction
A technology of absorption spectroscopy and trace gas, which is applied in the field of cavity-enhanced absorption spectroscopy devices, can solve the problems of simultaneous monitoring of gas trace gas concentration and limitations of aerosol extinction measurement, and achieve low price, high sensitivity and time resolution, The effect of simple operation of the device
Inactive Publication Date: 2015-05-06
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0004] The technical problem to be solved by the present invention is: in order to make up for the measurement limitations of traditional measurement techniques that cannot simultaneously monitor gas trace gas concentration and aerosol extinction, the present invention proposes a cavity-enhanced absorption method for simultaneous measurement of trace gas concentration and aerosol extinction Spectroscopy device and method
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[0030] The preferred technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereby.
[0031] like figure 1 Schematic diagram of a basic structure of a cavity-enhanced absorption spectroscopy device for simultaneous monitoring of trace gas concentration and aerosol extinction. Among them, 1 is the broadband light source, 2 and 11 are the first and second lenses, 3 is the diaphragm, 4 and 9 are the first and second high reflection mirrors, 5 and 8 are the first and second purge protection gas inlets Air port, 6 is the sampling air inlet, 7 is the exhaust port, 10 is the optical filter, 12 is the optical fiber, 13 is the spectrometer and 14 is the optical cavity. The light emitted by the broadband light source 1 is collimated by the first lens 2 and enters the optical cavity through the diaphragm 3. The light beam is reflected and absorbed mult...
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Abstract
The invention relates to a cavity enhanced absorption spectrum device and method for simultaneous measurement of trace gas concentration and aerosol extinction. The LED temperature is controlled by a semiconductor refrigeration chip to ensure the stability of light intensity output. High reflectivity mirrors at both ends of an optical cavity have the same curvature radius and reflectivity greater than 99.9%, and compose a stable optical resonator. Usually, cavity enhanced absorption spectrum measures the light intensity in the cavity with or without gas absorption and the variation curve of the high reflectivity mirrors' lens reflectivity along with the wavelength, and finally the concentration of absorption gas in the cavity can be obtained. The device and the method provided by the invention can realize simultaneous measurement of trace gas concentration and aerosol extinction. The actual measured total absorption coefficient is divided into two parts, one part is a trace gas absorption structure changing rapidly along with the wavelength, and the other part is gas scattering and aerosol extinction coefficient changing slowly along with the wavelength. Nonlinear least-square fitting is carried out on the measured total absorption coefficient to calculate the concentration of the to-be-measured trace gas, and finally the gas absorption structure and gas scattering are deducted from the total absorption coefficient so as to obtain the aerosol extinction coefficient.
Description
technical field [0001] The invention relates to the field of trace gas and aerosol monitoring, in particular to a cavity-enhanced absorption spectroscopy device and method for simultaneous measurement of trace gas concentration and aerosol extinction, suitable for simultaneous monitoring of trace gas concentration and aerosol extinction coefficient. Background technique [0002] With the rapid development of my country's economy, the acceleration of urbanization and industrialization, the problem of environmental pollution is becoming more and more obvious, especially in recent years, the regional air pollution problems such as photochemical pollution, haze fine particle pollution seriously exceed the standard, air pollution The situation is becoming increasingly prominent. Environmental monitoring is an important part of environmental protection, and the improvement of environmental monitoring technology plays an important role and significance in promoting environmental pro...
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IPC IPC(8): G01N21/31
Inventor 秦敏段俊方武卢雪沈兰兰谢品华刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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