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Simultaneous reconstruction method of optical constants and particle size distribution of spherical particles based on forward scattering multi-angle measurement

A technology of optical constants and spherical particles, applied in the field of physical parameter measurement of spherical particles, can solve the problems of inaccurate measurement results, etc., and achieve the effect of easy theoretical solution, high efficiency and sensitivity, and simple model.

Active Publication Date: 2017-11-17
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that in the existing conventional method for measuring the optical constant of spherical particles and the particle size distribution of the particle system, the measurement results of the two cannot be obtained at the same time, and the measurement results are inaccurate. Simultaneous reconstruction method of angularly measured optical constants and particle size distributions of spherical particles

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  • Simultaneous reconstruction method of optical constants and particle size distribution of spherical particles based on forward scattering multi-angle measurement
  • Simultaneous reconstruction method of optical constants and particle size distribution of spherical particles based on forward scattering multi-angle measurement
  • Simultaneous reconstruction method of optical constants and particle size distribution of spherical particles based on forward scattering multi-angle measurement

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specific Embodiment approach 1

[0038] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the simultaneous reconstruction method of spherical particle optical constant and particle size distribution based on forward scattering multi-angle measurement described in this embodiment, it includes the following steps:

[0039] Step 1: Fill the particles to be tested with the same concentration into a thickness of L 1 The first sample container is inside and the thickness is L 2 in the second sample container, so that the sample particles to be tested in the two sample containers are in a suspended state;

[0040] Step 2: Use the wavelength as λ 1 The continuous laser light vertically irradiates the left side surface of the first sample container along the thickness direction of the first sample container, and is incident on the sample particle system to be measured in the first sample container, and then along the right side of the first sample container Surface trans...

specific Embodiment approach 2

[0061] Specific implementation mode 2: This implementation mode further explains the implementation mode 1, and the inverse problem in step 4 and step 7 is realized by leapfrog algorithm.

specific Embodiment approach 3

[0062]Specific implementation mode three: this implementation mode further explains implementation mode one or two, and the specific method for obtaining the radiation intensity field in the calculation domain in step five is:

[0063] Calculated using the following radiative transfer equation:

[0064]

[0065] In the formula, I(x, θ) is the radiation intensity at the direction x of the zenith angle θ, x is the position in the radiation field to be obtained, I(x, θ′) is the radiation intensity at x in the direction θ′; θ′ is the radiation intensity to be obtained Measure the incident direction of radiation received by any point inside the sample particle system, Φ(θ′,θ) is the scattering phase function of the sample particle system to be measured incident from the θ′ direction and scattered from the θ direction.

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Abstract

The invention relates to a simultaneous reconstruction method of spherical particle optical constants and particle size distribution based on forward scattering multi-angle measurement, belonging to the technical field of physical parameter measurement of spherical particles. The invention aims to solve the problem that in the existing conventional methods for measuring the optical constant of spherical particles and the particle size distribution of particle systems, the measurement results of the two cannot be obtained at the same time, and the measurement results are inaccurate. In the measurement process, it uses two continuous lasers with different wavelengths to irradiate the surface of the spherical particle system sample, and uses the detector to measure the transmission signals of the particle system at different angles, and finally obtains the optical constants and particle size distribution of the particle system indirectly through the inverse problem solving technology. Situation; it establishes the direct and inverse problem solving models of the transmission signal measurement of the spherical particle system at different angles, and proposes a simultaneous reconstruction technology of optical constants and particle size distribution of the particle system on the premise that other parameters of the particle system are known. The invention is used for simultaneous reconstruction of spherical particle optical constant and particle size distribution.

Description

technical field [0001] The invention relates to a simultaneous reconstruction method of spherical particle optical constants and particle size distribution based on forward scattering multi-angle measurement, and belongs to the technical field of physical parameter measurement of spherical particles. Background technique [0002] Granular systems are ubiquitous in nature and in industrial production. It involves petrochemical, biopharmaceutical, building material production, infrared detection, satellite remote sensing and many other fields. The radiation properties of particles, such as optical constants, scattering coefficients, and absorption coefficients, all directly affect the basic process of radiation transmission. Therefore, it is particularly important to solve the optical constants of the particles. The particle size distribution of the particle system is also one of its important parameters and technical indicators, which is closely related to the efficient use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
Inventor 任亚涛齐宏史要涛于创利于翠萍阮立明谈和平
Owner HARBIN INST OF TECH
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