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Double-channel light cavity ring-down atmospheric aerosol extinction instrument and extinction factor measuring method

A technology of atmospheric aerosol and optical cavity ringdown, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of inability to achieve real-time monitoring, measurement error of aerosol extinction coefficient, and affecting the value of aerosol extinction coefficient Accurate value and other issues, to achieve the effect of reducing the detection limit, avoiding changes in properties, and high degree of automation

Inactive Publication Date: 2013-06-12
CHINESE ACAD OF METEOROLOGICAL SCI +1
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Problems solved by technology

Since the concentration of some gases in the actual atmosphere changes rapidly with time, if the gas extinction coefficient at a time point is used to replace the gas extinction coefficient for a period of time, it will cause errors in the measurement of the aerosol extinction coefficient. Therefore, this existing The optical cavity ring-down aerosol extinction instrument still has errors in the measurement of the actual atmospheric aerosol extinction coefficient, especially when the background gas concentration changes rapidly, this error even affects the exact value of the aerosol extinction coefficient value, Therefore, if a real-time and accurate aerosol extinction coefficient is to be obtained, it is necessary to monitor the change of the extinction coefficient of the gas including the background gas in real time, but the existing single-channel optical cavity ring-down aerosol extinction instrument cannot achieve this real-time monitoring

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  • Double-channel light cavity ring-down atmospheric aerosol extinction instrument and extinction factor measuring method
  • Double-channel light cavity ring-down atmospheric aerosol extinction instrument and extinction factor measuring method
  • Double-channel light cavity ring-down atmospheric aerosol extinction instrument and extinction factor measuring method

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Embodiment Construction

[0036] The 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.

[0037] as attached figure 1 As shown, the dual-channel optical cavity ring-down atmospheric aerosol extinction instrument of the present invention includes an optical path system, an electrical circuit system, and an air path system as a whole, wherein the optical path system at least includes a first optical cavity 1, a second optical cavity 2, and a light source as a light source. Laser 3, the monochromatic laser output by the laser 3 is guided into the first optical cavity 1 and the second optical cavity 2 as dual channels, and simultaneously forms oscillation in it; the gas circuit system includes a protective gas circuit and a sample gas circuit , used to provide protective gas and sample gas to be measured to the first optical cavity 1 and the second optical cav...

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Abstract

The invention provides a double-channel light cavity ring-down atmospheric aerosol extinction instrument and an extinction factor measuring method. According to the extinction instrument, utilizes a double-channel light cavity ring-down spectrum technology is applied to carry out in-situ real-time measurement on an extinction factor of atmospheric aerosol. The instrument comprises a light path system, a circuit system and a gas path system, wherein the light path system is internally provided with a first light cavity and a second light cavity, and the first light cavity and the second light cavity are utilized as double channels; and the gas path system respectively provides atmospheric gas and background atmospheric gas containing the aerosol for the first light cavity and the second light cavity, the circuit system can eliminate the transformation of the extinction factor of the aerosol caused by gas change in real time, and the extinction factor value of the atmospheric aerosol is accurately measured in a real time.

Description

technical field [0001] The invention relates to the field of measurement of atmospheric aerosol extinction coefficient, in particular to a dual-channel optical cavity ring-down atmospheric aerosol extinction instrument and a method for measuring the atmospheric aerosol extinction coefficient. Background technique [0002] Atmospheric aerosol extinction refers to the phenomenon that particles or liquid droplets in the atmosphere cause light scattering and absorption loss, causing light to attenuate when it passes through. To accurately obtain the extinction coefficient of atmospheric aerosols, the astigmatism coefficient and absorption coefficient of the aerosol are usually measured separately, and the sum of the astigmatism coefficient and the absorption coefficient is the atmospheric aerosol extinction coefficient. At present, the measurement of astigmatism coefficient is relatively mature, and it can realize accurate and fast measurement, and the experimental error can rea...

Claims

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Application Information

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IPC IPC(8): G01N21/17
Inventor 李凌颜鹏陈建民
Owner CHINESE ACAD OF METEOROLOGICAL SCI
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