Granule graininess, concentration and density measuring method and device

Abstract

The invention discloses a measuring method and device for measuring the particle granularity, consistency and density, which relates to the technical field of ultrasonic measurement. The invention aims at solving the technical problem of increasing the commonality and the precision of the ultrasonic measurement. The measuring device includes a computer, a signal process circuit, a pulse wave launch / receive circuit and a broadband transducer, which are orderly connected together; the broadband transducer is arranged at the external side of a baffle plate. The process procedures of the computer are as follows: ultrasonic amplitude phase spectrum is obtained after the rapid Fourier transformation of the signal, and then the phase spectrum is converted to obtain a reflection coefficient, the acoustic characteristic impedance, the acoustic attenuation coefficient and the sound velocity; the compound density can be calculated by the measuring value, and the consistency can be calculated through the known particle and the density of the continuous medium; the frequency analysis of the direct reflection wave and the transmission echo is carried out to obtain difference between the acoustic attenuation spectrum and the theoretical acoustic attenuation spectrum, and the difference is then regarded as the objective function, and then is optimized with optimization method to calculate the distribution of the particle granularity. The invention has the advantages of measuring and analysis basing on the reflecting ultrasonic, great commonality and precise measuring result.

Description

technical field [0001] The present invention relates to ultrasonic measurement technology, in particular to a method and device for simultaneously measuring particle size, concentration and mixture density of discrete particles in two-phase flow (suspension or emulsion) using reflected ultrasonic signals Technology. Background technique [0002] The measurement of the particle size and concentration of dispersed particles in two-phase flow has a wide application background in the fields of energy, chemical industry, medicine, environment, water conservancy, materials and other fields involving two-phase flow. Existing particle measurement methods such as sieving, microscopy, holography, electrical induction, sedimentation, and light scattering are usually difficult to achieve rapid, non-contact online measurement under high concentration conditions. [0003] Ultrasound has a wide frequency range, strong penetrating ability, can propagate in colored or even opaque substances...

AI Technical Summary

Problems solved by technology

The existing ultrasonic particle concentration measurement methods mostly use empirical formulas or pre-calibration, and fail to take into account the influence of particle size differences in polydisperse distribution states on sound attenuation and sound velocity spectrum. Strict acoustic theoretical models have shown that particle size and The difference in distribution has a great influence on sound attenuation and sound velocity. Neglecting this effect will lead to poor versatility of the measurement method, making it difficult to ensure accurate results and obtain the particle size distribution of particles.

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