Simultaneous Measurement Method of Optical Constant and Particle Size Distribution of Spherical Particles Based on Multi-angle Light Scattering-Transmission Method
A technology of multi-angle light scattering and spherical particles, which is applied in the directions of transmittance measurement, scattering characteristic measurement, particle and sedimentation analysis, etc., which can solve the problems of large error in measurement value and weak measurement signal
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specific Embodiment approach 1
[0021] Specific embodiments 1. The method for simultaneously measuring the optical constant and particle size distribution of spherical particles based on the light scattering-transmission method described in this embodiment, the specific operation steps of the method are:
[0022] Step 1: Put the particles to be tested at the same concentration into a semi-cylindrical first sample container with a radius r and a second sample container with a thickness L, so that the sample particles to be tested in the two sample containers are in a suspended state ;
[0023] Step 2: Using the wavelength λ, the continuous steady-state laser light vertically irradiates the arc-shaped surface of the first sample container with a radius of r along the diameter direction of the first sample container, and is incident on the to-be-measured surface in the first sample container. The sample particle system, the scattered light is transmitted and output along the arc-shaped surface of the first samp...
specific Embodiment approach 2
[0034] Specific implementation mode two, this implementation mode further explains implementation mode one, the inverse problem in step three and step six adopts improved quantum particle swarm algorithm to realize, and described improved quantum particle swarm algorithm comprises the following steps:
[0035] Step A. Input system control parameters, namely: particle population size N s , the search space of the problem R=[low i , high i ], the maximum number of iteration steps N t , the dimension N of the problem and the maximum tolerance ε allowed by the objective function o the value of; i=1,2,...,N;
[0036] Step B. Using the chaos theory model in the search space R, for each particle position X i Initialize and evaluate the position of each particle and calculate the corresponding objective function F obj (X i ); Then, take the position of the current particle as the optimal position of the individual particle history P i ;Finally, find the particle with the smalle...
specific Embodiment approach 3
[0046] Specific implementation mode three. This implementation mode further explains implementation mode one. The specific method for obtaining the radiation intensity field in the calculation domain in step four is:
[0047] The scattered light intensity and spectral hemispherical transmittance were calculated using the following Mie theoretical equation:
[0048]
[0049]
[0050] i 1 =|S 1 (Θ)| 2 ,i 2 =|S 2 (Θ)| 2
[0051]
[0052] Among them, S 1 (Θ) and S 2 (Θ) is a complex amplitude function in Mie theory, i 1 and i 2 is the Mie scattering function, and its specific calculation formula comes from Mie theory. I(Θ,r,χ) represents the scattered light intensity at the scattering angle Θ from the center of the sphere r. χ is a scale parameter, defined as χ=πD / λ, D represents the particle size of a single particle, N is the particle number density of the particle system; f(χ) is the number probability density distribution function. L represents the stroke ...
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