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Novel method for measuring extinction coefficient of atmospheric aerosol

A technology of atmospheric aerosol and extinction coefficient, which is applied in the direction of scattering characteristic measurement, color/spectral characteristic measurement, etc., to achieve the effects of improved sensitivity, convenient operation and long optical path

Inactive Publication Date: 2013-04-17
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

All of the above methods have certain limitations, for example: the forward detection method requires a certain measurement distance (optical path), while the backward, lateral and reflection methods are all inversion methods, not direct measurement. In addition, the above methods are generally is the extinction coefficient measured at a certain wavelength

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  • Novel method for measuring extinction coefficient of atmospheric aerosol
  • Novel method for measuring extinction coefficient of atmospheric aerosol
  • Novel method for measuring extinction coefficient of atmospheric aerosol

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Embodiment Construction

[0031] Such as figure 1 As shown, the new method of measuring the extinction coefficient of atmospheric aerosol by using a coated glass tube includes a glass tube 1, the inner and outer walls of the glass tube 1 are coated with a high reflective film, and there are aerosol inlets, outlets 2, 3 and beam inlets, outlets 4 , 5, the aerosol inlet and outlet 2, 3 are respectively located at the two ends of the glass tube 1 and are all perpendicular to the glass tube 1, the aerosol inlet 2 is provided with an air valve 6, the aerosol outlet 3 is provided with an air pump 7, and the light beam enters, The exits 4 and 5 are respectively located at both ends of the glass tube 1 and form a certain angle with the glass tube. The beam entrance 4 is provided with a laser diode 8 with multiple wavelengths as a light source, and the light between the laser diode 8 and the beam entrance 4 The road is equipped with a collimator and a beam splitter 9. The beam emitted by the laser diode 8 passe...

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Abstract

The invention relates to a novel method for measuring the extinction coefficient of atmospheric aerosol. According to the method, a film plated glass pipe, a laser light source, an optical system and a data collection system are included, wherein light has long transmission light path and low loss in the film plated glass pipe, light of a certain wavelength makes long-distance transmission with a certain angle between pipe walls in the glass pipe filled with aerosol, the attenuation information of light by aerosol can be measured through probes at two ends of the glass pipe, and multiple reflections of light in the glass pipe greatly improves the extinction sensitivity of aerosol. The invention sets up the measurement formula of the extinction coefficient of a wave of multi-wavelength, and the relative calculation method based on the ratio avoids the measurement error caused by light intensity fluctuation during photoelectric conversion; and the novel method has the characteristics of simple principle, convenience in operation and fastness in detection speed.

Description

technical field [0001] The invention relates to the field of aerosol extinction coefficient measurement, in particular to a new method for directly measuring atmospheric aerosol extinction coefficients, which can measure the atmospheric aerosol extinction coefficients of multiple wavelengths in real time. Background technique [0002] Atmospheric aerosols are an important part of the atmosphere and an important factor in the physical and chemical processes of the atmosphere. Atmospheric aerosols have important direct and indirect effects on climate change. They absorb and scatter solar radiation through aerosol particles and directly change the earth- Energy budget of gas system. Based on atmospheric light scattering, the measurement of aerosol optical properties, especially the extinction coefficient at different wavelengths, and the establishment of wavelength conversion relationships can deepen the understanding of aerosol optical properties and expand the research on rad...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/49
Inventor 李学彬宫纯文朱文越徐惠玲高亦桥徐青山魏合理
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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