Integrating sphere embedded photo-thermal interferential aerosol scattering and absorbing synchronous measurement device

Abstract

The invention discloses an integrating sphere embedded photo-thermal interferential aerosol scattering and absorbing synchronous measurement device. The core is to depend on an optical path system and an air path system of the integrating sphere; the optical path system comprises a stimulating optical path and a detection optical path; some energy of the stimulating optical path is scattered by the aerosol particle and then a scattering signal is generated under the effect of integrating sphere; and meanwhile, the energy has a photothermal effect with the aerosol particle so as to generate an aerosol absorbing signal; the detection optical path is divided into an absorbing measuring part and a scattering measuring part; the scattering measurement adopts an integral optical detector for realizing the scattering coefficient measurement; an optical type Michelson vertical reflecting interference sensing structure is adopted for absorbing measurement; the photo-thermal interference principle is utilized to realize the absorbing coefficient measurement; the scattering and absorbing coefficient measurement of multiple wavelengths can be realized through the device; parameters, such as, aerosol extinction coefficient and single scattering reflection ratio can be acquired through simple treatment on the above basis; the research work for aerosol optical property can be further satisfied; the integrating sphere embedded photo-thermal interferential aerosol scattering and absorbing synchronous measurement device is suitable for the online detection for the atmospheric aerosol optical property.

Description

Technical field [0001] The invention relates to an aerosol on-line detection method, in particular to an aerosol scattering and absorption synchronous measurement device with light-heat interference embedded in an integrating sphere, belonging to the optical field. Background technique [0002] Atmospheric aerosol particles refer to various solid, liquid and mixed solid-liquid particles suspended in the atmosphere, and their particle size is generally 10 -9 ~10 -4 m, the scale spans 5 orders of magnitude, and the concentration spans up to 12 orders of magnitude. The sources include natural aerosols and man-made aerosols produced by human activities. It has the characteristics of complex chemical composition, wide spatial distribution, and strong temporal and spatial variability of microphysical parameters. The direct, semi-direct and indirect radiative forcing in the earth's atmosphere system plays an important role, and has an important influence on local, regional and even globa...

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Problems solved by technology

[0004] At present, there have been studies on aerosol absorption coefficient based on photothermal interference spectroscopy in the world, and good results have been achieved. However, the measurement of aerosol scattering coefficient

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