Measurement method of particle size distribution of particle system

Abstract

The invention discloses a measurement method of particle size distribution of a particle system. The measurement method comprises following steps of establishing an integral equation relation betweenscattered light intensity distribution and particle size of a particle swarm by using a near-field scattering technique and performing discretization; constructing a function e, and determining a cutoff value of a best singular value by minimizing the function e; selecting a regularization parameter alpha by using an L curve method, and constructing a filter factor by combining the cutoff value ofthe best singular value, so as to obtain an approximate solution form of a particle size distribution column vector; and performing iteration calculation by using a Chahine iteration algorithm, so asto obtain a convergent solution to realize measurement of particle size distribution of the particle swarm. The introduced improved filter factor exerts model effective information greatly, and particle size distribution of particle systems with close particle size peak interval can be measured highly accurately and stably.

Description

technical field [0001] The invention belongs to the technical field of particle size measurement, and in particular relates to a high-resolution measurement method for particle size distribution of particle systems. Background technique [0002] Particles are closely related to human production and life. Obtaining particle size information can help protect human health, improve product performance, and monitor environmental pollution. The measurement methods of particle size can be divided into light scattering method, electric induction method, microscope method, sieving method and sedimentation method according to the measurement principle. Among them, the light scattering method has strong applicability, real-time fast, wide measurement range and good measurement repeatability. , non-contact and other advantages, has received widespread attention. Combining light scattering with intelligent optimization algorithms is currently the most widely used particle measurement te...

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Problems solved by technology

[0004] The particle size measurement of the light scattering method needs to solve the first kind of Fredholm integral equation, which is an ill-conditioned problem. The inversion algorithm with high performance is very important to the measurement results. In the case of high resolution of the particle size distribution of the particle system, the traditional Inversion algorithm is difficult to get satisfactory results

Existing algorithms for solving bimodal particle size distribution, such as function-limited solution, wavelet regularization inversion, and vector similarity measurement algorithm, have been proved to have good inversion effects on particle systems with far-distant peak particle sizes. The measurement accuracy needs to be improved for the near-distance peak distribution particle system solution with diameter ratio less than 1:2.5

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