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Device for detecting shapes of single aerosol particles in real time

A particle shape, real-time detection technology, applied in the direction of measuring devices, individual particle analysis, particle and sedimentation analysis, etc., can solve the problems of multi-aerosol particle enrichment time, relatively low real-time performance, and not suitable for single aerosol particles, etc. Achieve the effect of improving detection accuracy, avoiding missed detection, and reducing overlapping errors

Active Publication Date: 2015-07-29
上海镭慎光电科技有限公司
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Problems solved by technology

However, this method is based on the principle of biofluorescence analysis technology, and the fluorescence spectrum intensity of the enriched multiple bioaerosol particles is used as the detection object, and it takes time for the enrichment of multiple aerosol particles, and the relative real-time performance is low, so it is not suitable for elastic scattering. Applications of optical principles for real-time detection of single aerosol particle shape

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  • Device for detecting shapes of single aerosol particles in real time
  • Device for detecting shapes of single aerosol particles in real time
  • Device for detecting shapes of single aerosol particles in real time

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Embodiment Construction

[0069] The present invention will be described in detail below with reference to the drawings and embodiments, but the protection scope of the present invention should not be limited thereto.

[0070] First, the method is described below based on a theoretical two-dimensional scattering pattern of spherical particles. The Mie scattering theory is suitable for calculating the light field scattered by spherical particles with a particle size between 100nm and 10μm.

[0071] Assuming that the incident light is unpolarized light, the wavelength λ=632.8nm, based on the Mie scattering theory, the first-order minimum value of the light intensity distribution curve corresponding to the scattering angle of the scattering light field of spherical particles with different particle diameters d of refractive index m=1.59 and The position of the maximum value of level 1. According to the numerical aperture NA of the conventional optical receiving system is about 0.34, the receiving and sca...

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Abstract

The invention discloses a device for detecting shapes of single aerosol particles in real time. The device comprises a single particle focusing gas path, a scattering cavity, a power supply system, two positioning trigger units, a scattering pattern detection unit and a microcomputer control processing unit. On the basis of characteristics of forward and lateral scattered light fields of the particles and in combination of related information of particle size measurement, the device judges the shapes of the particles, the detectable lower limit of particle size is increased, and the accuracy in actual application is high; with the adoption of the scattering cavity design, the structure is simpler, the stability is high, and assembling and debugging of optical systems are easy; in combination of the single particle aerodynamics focusing gas path technology as well as automatic control of the microcomputer control system, the single aerosol particles are detected in real time.

Description

technical field [0001] The invention relates to real-time detection of aerosols, especially a method and device for rapid detection of the shape of a single aerosol particle with strong real-time performance. distinction and discrimination. The invention can be applied to the fields of environment detection and the like. Background technique [0002] Aerosol refers to multiple mixed systems formed by solid or liquid particles dispersed and suspended in a gaseous medium. The particle or particle size is 0.001-100 μm. It is customary to call these particles aerosols. Particles with a diameter of less than 10 μm can float in the atmosphere for a long time and are called floating dust. [0003] Aerosol particles have an important impact on many physical and chemical processes such as earth-atmosphere radiation balance, cloud formation to rain, water cycle, and visibility changes, as well as human health. Aerodynamic particle size d p Aerosol particles smaller than 10 μm ar...

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Application Information

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IPC IPC(8): G01N15/14
Inventor 赵永凯卜一川廖小情张佩孙征宇陈正岩黄惠杰
Owner 上海镭慎光电科技有限公司
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