Method for measuring particle concentration and sizes on basis of ultraphonic impedance spectrum

Abstract

The invention relates to a method for measuring particle concentration and sizes on the basis of an ultraphonic impedance spectrum. The method comprises that steps that 1, a theoretical impedance real component spectrum is obtained through an ECAH model and theory; 2, a theoretical curve of particle size-resonant frequency and a theoretical curve of a concentration-resonant amplitude are obtained; 3, an acoustic impedance spectrum is obtained from experiments according to an ultrasonic transducer and calculation, a real time component is taken from the acoustic impedance spectrum, and an experimental impedance real component spectrum is obtained; treatment is conducted on signals obtained from the experiments through a formula in the third step, resonant frequency for measuring the object impedance real component spectrum can be obtained, the resonant frequency fR is extracted, and the concentration and the particle size of a measured object can be obtained from the curves of the particle size-resonant frequency and the concentration-resonant amplitude determined in the second step. According to the method for measuring the particle concentration and sizes on the basis of the ultraphonic impedance spectrum, a system is simple in structure and low in cost, online measurement can be achieved, and the method can be used for the laboratory science research; compared with utilizing the ultrasonic attenuation and phase velocity, the method is more suitable for measurement of particles in a high concentration two-phase mixture.

Description

Technical field [0001] The invention relates to an ultrasonic measurement method, in particular to a method for measuring the particle size and concentration of particles in a two-phase mixture based on the principle of ultrasonic impedance spectroscopy. Background technique [0002] Because the particles cover many fields such as energy, chemical industry, food, medicine, and the nature of the particles has an impact on the product and process control in these fields, such as the use effect of drugs, the shelf life of food, the utilization rate of energy, and the impact on the 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 shortcomings. One of the common shortcomings is that they are not eas...

AI Technical Summary

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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