Multi-spectral back scattering type soot grain size and concentration measuring device and measuring method thereof

Abstract

The invention belongs to the field of environmental pollution monitoring, and particularly relates to a multi-spectral back scattering type soot grain size and concentration simultaneous measuring device and a measuring method thereof. Visible light emitted from a wide-spectrum light source is emitted into a flue via an illuminating optical fiber in a reflecting type optical fiber probe, and is scattered by soot in the flue so as to form scattered light, the scattered light enters a readout optical fiber via dustproof glass with a fixed-period purging device, and is split by a light splitter, multi-spectral light intensity information of the back scattered light is acquired by a linear array CCD (charge coupled device), and a signal acquisition and data processing portion realizes modeling, inverting and monitoring. A detector of the measuring device can be integrated with the light source, angle debugging is omitted, and the measuring device has higher sensitivity according to a scattering theory. The measuring method has the advantages of simple solution procedures, fast inverting speed, stable inverting results and the like.

Description

technical field [0001] The invention belongs to the field of environmental pollution monitoring, and in particular relates to a simultaneous measurement device and measurement method based on multispectral backscattering smoke particle size and concentration. Background technique [0002] Scattering occurs when light interacts with particles. The detector is installed at a certain scattering angle, and after obtaining the scattered light intensity data, the inversion of the particle size and concentration of smoke and dust is realized based on the scattering theory. The light scattering method retains the advantages of long-distance and long-term continuous measurement of emission sources in the turbidity method. However, the detector and the light source of the forward scattering method and the edge scattering method are still placed separately, so the installation is complicated and the angle is required to be precise; while the currently commonly used turbidity method ha...

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Problems solved by technology

However, the detector and the light source of the forward scattering method and the edge scattering method are still placed separately, so the installation is complicated and the angle is required to be precise; while the currently commonly used turbidity method has little change in light intensity when the smoke concentration is extremely low; the concentration is extremely high When the light intensity attenuation is too large, the signal-to-noise ratio is greatly reduced, so in the above cases, the effect is poor; when the smoke composition changes, the measurement results will also be biased

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