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 or extinction coefficient still relies on the assistance of other instruments, and different instruments may have measurement bands. Problems such as inconsistency, asynchronous measurement process, complex operation and large error

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