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Research on Particle Size Test Algorithm Based on Mie Theory

Author: WangXueYan
Tutor: LiuChanLao
School: Xi'an University of Technology
Course: Precision instruments and machinery
Keywords: Laser particle size analyzer Particle size measurement The scattered light intensity distribution Photodetector Inversion algorithm
CLC: TP301.6
Type: Master's thesis
Year: 2011
Downloads: 211
Quote: 1
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Abstract


Laser particle size analyzer based on Mie scattering theory by particle scattering intensity distribution inversion of particle size distribution, in theory, be attributed to the first kind of Fredholm integral equations, because this is a typical ill-posed problem, granularity anti algorithm is the core content and hot laser particle size analyzer. Therefore it is very necessary and urgent to carry out research in this area. This study focused inversion algorithm based on Mie scattering theory granularity test. VisualC 6.0 software, combined with laboratory testing platforms, mainly to the completion of the work are as follows: 1) on the basis of the Mie scattering theory and laser particle size analyzer works, the establishment of a single particle and particle-based light scattering model, the theoretical derivation and Visual C 6.0 as a platform for simulation and verification, including Mie scattering light levels and distribution pattern simulation program, Numerical simulation of the angular distribution of the scattered light of different size particles. The particle system according to the different particle size range of angular distribution of the scattered light intensity, the design of the corresponding annular photodetector size parameters, and its particle system of the scattered light intensity simulation detection. 2) the typical non-independent mode and standalone mode inversion algorithm, summarizes the characteristics of each of the non-independent mode and standalone mode inversion algorithm. Simulation study found that: non-independent mode inversion algorithm is simple, but the need to meet a specific function of the particle size distribution of the particles prior assumptions, which limits its application to a large extent. Iterative inversion algorithm independent mode can be obtained theoretically arbitrary particle system, the particle size distribution, but it is extremely sensitive to noise and may easily cause distortion of the results of particle size measurement. 3) the introduction of random noise analog measured light energy column vector light energy distribution for the independent mode algorithm is extremely sensitive to noise, easy distortion caused by particle size measurements, carried out in-depth research, discusses the complexity of the light energy distribution and denoising on light energy from the actual measurement is not easy operability, the introduction of data smoothing algorithm, smoothed inversion results, effectively eliminates the error improve the precision and reliability of the particle size measurement. 4) in the existing test platform, a lot of testing of standard samples, combined with simulation study, analysis of error factors of the test system, the experimental system improvement program and requirements. Completed through the study of the subject, the theoretical analysis and experimental exploration of the laser particle size test system based on Mie scattering theory. The theoretical model is feasible, and the corresponding experimental study and the results are reliable. To solve the problems of the granularity test inversion algorithms practical applications affected by noise measurement distortion, to meet the high precision, reliable and stable modern powder industrial particle sizing requirements. It was found that the distribution tends to be the same by the smoothing processing, error will be further controlled through calibration, calibration, error.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Theories, methods > Algorithm Theory
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