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

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 ...

AI Technical Summary

Problems solved by technology

Photoelectric smoke technology uses the absorption and scattering of smoke particles to detect smoke. The scattering type is a point measurement, and the absorption type can only measure the average smoke concentration on the line.

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