A real-time dual-wavelength optical aerosol particle size measuring device

A particle size and aerosol technology, applied in the field of environmental detection, can solve the problems of different amplitudes of received light intensity, blurred particle size, different fluctuations, etc., and achieve the effect of improving detection accuracy.

Active Publication Date: 2015-07-08
上海镭慎光电科技有限公司 +1
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Problems solved by technology

[0021] 2) The refractive index of the particles is different, the amplitude of the received light intensity of the particles in the same particle size or similar particle size range is different, the fluctuation is different, the particle size is more blurred, and it is easy to cause particle size measurement errors
This technology requires multiple aerosol particle enrichment time, relatively low real-time performance, and is not suitable for real-time detection of single aerosol particle size based on the principle of elastic scattered light

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  • A real-time dual-wavelength optical aerosol particle size measuring device
  • A real-time dual-wavelength optical aerosol particle size measuring device
  • A real-time dual-wavelength optical aerosol particle size measuring device

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Embodiment Construction

[0092] The specific implementation method of the present invention is divided into two parts: the theoretical calculation of the scattered light field and the detection device.

[0093] I theoretical simulation

[0094] According to the actual semiconductor device index parameters, the wavelengths of the two selected light sources are λ 1 = 405nm and λ 2 = 980nm. According to Mie scattering theory and Van de Hulst judgment factor P, aerosol particles with different refractive index materials and particle sizes are selected. In practice, particle materials include substances whose refractive index varies with wavelength. For light scattering measurement, specific calculations can be made based on the particle type information in the environment. In the present invention, liquid water and hypothetical substances with fixed refractive indices of 1.5, 1.7, 2 and 2.5 are selected for calculation, discussion and analysis.

[0095] Table 1 Refractive index of water for different ...

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Abstract

A real-time dual-wavelength optical aerosol particle size measuring device is disclosed. The device comprises a single-particle focusing gas path, two light intensity detecting units, two optical field distribution detecting units, a scattering cavity, a microcomputer control unit and a power supply system. The device reduces influences of the particle refractive index, environment humidity, and other conditions on measurement of the particle optical-equivalent grain size by a light scattering method, and can improve particle size measurement sensitivity and accuracy. The particle refractive index is calculated by adopting a front side scattering optical field distribution detecting unit, thus improving particle size measurement accuracy. The device can be combined with other aerosol particle measuring techniques to improve measurement accuracy.

Description

technical field [0001] This patent relates to real-time detection of single aerosol particle size, especially a dual-wavelength single-aerosol particle size measurement device based on light scattering method with strong real-time performance, which can achieve high accuracy of aerosol particle size concentration ground detection. The invention can be applied to the fields of environment detection and the like. Background technique [0002] Aerosol refers to a mixed system formed by solid or liquid particles dispersed and suspended in a gaseous medium. The particle size ranges from 0.001 to 100 μm, and usually the dynamic diameter of the particles is between 0.01 and 10 μm, which can reside in the atmosphere for several hours. It is customary to refer to solid and liquid particles suspended in the atmosphere as aerosols. [0003] Particle size is an important parameter used to describe aerosol particles because it largely determines the behavior of particles suspended in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
Inventor 赵永凯陈正岩卜一川张佩黄惠杰
Owner 上海镭慎光电科技有限公司
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