Grain graininess and concentration measuring method and device thereof

Abstract

The measuring device comprises a computer used for data process, a signal process circuit connected to the computer, a pulse wave transmitting / receiving circuit connected to the signal processing circuit; a bandwidth transmitting / receiving transducer assembly connected to the pulse transmitting / receiving circuit. The data process program compares the measuring signal with the preset standard substance; the actually measured acoustic attenuation spectrum is combined with the acoustic attenuation spectrum obtained based on the scattering formula computational theory to construct the matrix and linear equation; using dual frequency attenuation ratioing to realize the calculation of average particle size; according to the particle size, inversely computes the particle concentration.

Description

technical field [0001] The invention relates to ultrasonic measurement technology, in particular to a measurement technology for particle size distribution and concentration of discrete particles in two-phase suspension or emulsion. Background technique [0002] Two-phase flow particle measurement technology refers to the measurement of particle size distribution and concentration of dispersed particles. It has a wide application background in many fields involving two-phase flow, such as power, chemical industry, medicine, environmental protection, materials, and water conservancy. A common feature of this application is that particulate matter needs to be measured in an on-line, non-contact, dilution-free (higher concentration) state. Existing particle measurement methods such as sieving, microscopy, holography, induction, sedimentation and light scattering are difficult to achieve the measurement of the above conditions. [0003] Because ultrasound has a wide frequency r...

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Problems solved by technology

[0004] In the existing ultrasonic particle concentration measurement methods, simple empirical formulas or sample calibration are used in advance, and the influence of different particle sizes in a polydisperse distribution state on the measurement of ultrasonic attenuation (or sound velocity) is not considered. In fact, the particle size The difference in distribution and distribution has a great influence on ultrasonic attenuation (or sound velocity). Neglecting this effect will lead to a large error in the measured concentration, and it is impossible to obtain accurate measurement results, and it is even more impossible to obtain the particle size

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