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Measurement Method of Particle Concentration and Size Based on Ultrasonic Impedance Spectroscopy

A technology of impedance spectroscopy and acoustic impedance, which is applied in the field of measuring particle size and concentration in two-phase mixtures based on the principle of ultrasonic impedance spectroscopy, can solve the problems of high concentration transmittance drop and achieve the effect of simple structure

Active Publication Date: 2017-09-29
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0004] The present invention aims at the problem of high-concentration transmittance decrease in the existing particle measurement technology, and proposes a method for non-invasive online measurement of particle concentration and particle size in conditions of high concentration or strong attenuation by using ultrasonic impedance spectroscopy

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  • Measurement Method of Particle Concentration and Size Based on Ultrasonic Impedance Spectroscopy
  • Measurement Method of Particle Concentration and Size Based on Ultrasonic Impedance Spectroscopy
  • Measurement Method of Particle Concentration and Size Based on Ultrasonic Impedance Spectroscopy

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Embodiment Construction

[0036] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] A method for measuring particle size and concentration based on ultrasonic impedance spectroscopy, specifically comprising the following steps:

[0038] 1) To use reflection spectrum to characterize the characteristics of particles, it is necessary to establish the relationship between acoustic impedance and particle two-phase medium according to the classical model of ultrasonic particle measurement—ECAH model (Epstein–Carhart–Allegra–Hawley). The model comprehensively considers viscous loss, heat loss, scattering loss and internal absorption. For granular two-phase systems, compression waves, shear waves, and thermal waves in elastic, isotropic, heat-conducting spherical solid particles and continuous Wave equations in phase media. The mathematical expression of its complex wave number κ is:

[0039] κ=ω / c(ω)+iα(ω)

[0040] in ω ...

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Abstract

The invention relates to a method for measuring particle size and concentration based on the principle of ultrasonic impedance spectroscopy, comprising the steps of: 1. Obtaining the theoretical impedance real part spectrum by using the ECAH model and theoretical calculation; 2. Obtaining the theory of "particle size-resonance frequency" curve and the theoretical curve of "concentration-resonance amplitude"; 3. The acoustic impedance spectrum obtained from the experiment is obtained through the ultrasonic transducer and calculation, and the real part of the experimental impedance spectrum is obtained by taking the real part of it; the signal obtained from the experiment is obtained by Through the formula processing described in step 3, the resonance frequency of the real part spectrum of the impedance of the measurement object can be obtained, and the resonance frequency can be extracted, and then the "particle size - resonance frequency" and "concentration - resonance amplitude" determined in step 2 The concentration and particle size of the measurement object can be obtained by checking the value of the curve. The system structure of the invention is simple and cheap, and the method can realize on-line measurement and can be used for laboratory scientific research. Compared with the use of ultrasonic attenuation and phase velocity, the method is more practical for the measurement of particles in a two-phase mixture with too high concentration.

Description

technical field [0001] The invention relates to an ultrasonic measurement method, in particular to a method for measuring particle size and concentration in a two-phase mixture based on the principle of ultrasonic impedance spectroscopy. Background technique [0002] Because particles cover many fields such as energy, chemical industry, food, and medicine, and the properties of particles have an impact on product and process control in these fields, such as the use effect of drugs, food shelf life, energy utilization, and equipment during the production process. damage. It can be seen that particles play a vital role in industry, and the detection of particles has also received extensive attention and research. In some recent studies, dynamic light scattering, PIV, and image methods have all been well used to measure particles. But they all have various disadvantages, one of which is that they are not easy to be used for the detection of particles at high concentrations. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01N15/06
Inventor 纪晓明苏明旭汪雪
Owner UNIV OF SHANGHAI FOR SCI & TECH
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