Two-dimensional smoke concentration field measuring device based on sheet light source

A technology of smoke concentration and measuring device, which is applied in the direction of measuring device, suspension and porous material analysis, particle suspension analysis, etc., to achieve the effect of promoting research, promoting realization, and good support

Active Publication Date: 2016-05-18
UNIV OF SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

Photoelectric smoke technology uses the absorption and scattering of smoke particles to detect smoke. The scatterin

Method used

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  • Two-dimensional smoke concentration field measuring device based on sheet light source
  • Two-dimensional smoke concentration field measuring device based on sheet light source
  • Two-dimensional smoke concentration field measuring device based on sheet light source

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Embodiment Construction

[0014] Although there are various geometric shapes of smoke particles, since the spatial orientation of particles can be considered random, Mie scattering calculations will not produce too much error if the spherical assumption is used, and the distance between smoke particles is large enough to satisfy the uncorrelated single scattering condition , the scattered wave intensity is additive, so the scattered light intensity of an aggregate with N smoke particles as scattering centers is N times the scattered light intensity of a single smoke particle.

[0015] According to the Mie scattering theory, when the wavelength is λ and the light intensity is I 0 When the ray is parallel incident on an isotropic spherical particle with diameter d, the scattering angle is The scattered light intensity at a distance r from the scatterer is I s :

[0016] I s = λ 2 8 ...

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Abstract

The invention discloses a two-dimensional smoke concentration field measuring device based on a sheet light source. The device comprises a smoke generation device, a laser emission device and a photographing and processing device, wherein the smoke generation device comprises a smoke generation box, a disturbance draught fan, a porous rectification layer, a glass smoke cavity and an optical smoke densimeter; the laser emission device comprises a laser device, a sheet light source lens set, a cylindrical lens, a plurality of upright columns and a guide rail A; the photographing and processing system comprises a CCD camera, an upright column, a guide rail B and a computer, the CCD camera receives scattered light of the sheet light source in the lateral vertical direction, intensities of the scattered light in different positions in a two-dimensional plane are obtained through image processing, a relative two-dimensional smoke concentration field is calculated according to a light scattering theory, and finally obtained data can be calibrated through linear average concentration measured by the linear optical smoke densimeter. Interference to a smoke field is small, smoke with uniform concentration distribution can be generated by means of disturbance and rectifying design, and theoretical research is well supported.

Description

technical field [0001] The invention relates to the technical field of smoke concentration field measurement, in particular to a two-dimensional smoke concentration field measurement device based on a sheet light source. Background technique [0002] Smoke is a characteristic parameter accompanying the whole process of fire, and it is one of the characteristics that people are most concerned about in the field of fire science research. Smoke concentration directly reflects the amount of smoke, the reduction of visibility and the degree of harm of smoke. It is used as the basic experimental parameter in the standard fire test. Commonly used fire smoke concentration measurement devices are mainly divided into two types: ion-sensing smoke type and photoelectric smoke-sensing type. The ion-sensing smoke-type smoke concentration measuring device is a point-type measurement, and there are great restrictions on the distance between the detector and the fire source and the size of ...

Claims

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Application Information

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IPC IPC(8): G01N15/06
CPCG01N15/06G01N2015/0693
Inventor 张永明林高华贾阳王进军王锋
Owner UNIV OF SCI & TECH OF CHINA
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