A fast calculation method of mie scattering for on-line monitoring of dust particles

Abstract

The invention discloses a rapid calculation method for mie scattering applied to dust particulate matter online monitoring. The method comprises the following steps that a particle scattering system is calculated, and a scattering coefficient table is formed; a particle size distribution mathematic model is built, and a reasonable initial value of a model parameter in an optimization algorithm is selected; particulate matter size distribution is subjected to inversion, and the particulate matter concentration is calculated. The particle theory scattering system is calculated in advance, a table look-up method is adopted for model parameter optimization calculation, repeated loop computation is avoided, and the calculation time is greatly shortened; a grid method is adopted in the algorithm for searching for a reasonable model parameter initial value for performing the first-time optimization algorithm, so that the global minimum value of a target function is accurately obtained; the model parameter initial value not measured at the first time is set as the model optimal parameter calculated the last time, iterations are reduced, and the operating speed is increased; the method has the advantages that the dust particulate matter size application range is large, and concentration change speed is large, and the method is used for a measuring system for performing real-time measurement of the dust particulate matter concentration.

Description

technical field [0001] The invention relates to the technical field of dust particle concentration measurement, in particular to a mie scattering fast calculation method applied to the online monitoring of dust particles. Background technique [0002] The sources of particulate matter in the atmosphere are complex, and the research results show that dust is an important factor causing atmospheric particulate matter pollution. The dust particle size range is large and the concentration changes rapidly. Therefore, the monitoring of dust changes requires a method with a wide range of applications, fast measurement speed, and online real-time measurement. [0003] The light scattering method to measure the concentration of particulate matter has the advantages of fast measurement speed, simple and convenient device, and real-time measurement. The principle of light scattering means that when the light hits the particles in the medium, the interaction with the medium will deviat...

AI Technical Summary

Problems solved by technology

However, in the current data processing process, the speed is slowed down due to improper selection of the initial value and repeated calls to the Mie scattering function. Generally, each data processing time reaches more than 90s, which greatly affects the response speed of the instrument and cannot meet the tracking measurement requirements for the concentration of dust particles.

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