Method for measuring particle diameter and concentration based on ultrasonic pulsation principle

Abstract

The invention relates to a method for measuring particle diameter and concentration based on an ultrasonic pulsation principle. A transmitted acoustic intensity is attenuate when an incidence ultrasonic wave is scattered and absorbed through a granular medium; focused ultrasound is adopted and a measurement area is arranged in an ultrasonic focused acoustic beam band; when a ratio of the particle diameter to ultrasonic focused acoustic beam diameter is controlled within a scope of 0.1-20, quantity and diameters of particles passing the acoustic beam vary with time, and transmitted acoustic intensity fluctuates and varies with time, to generate an acoustic pulse effect; random pulsation of the ultrasonic signal is related to quantity and diameters of particles in the ultrasonic focused acoustic beam measurement area at the moment of measuring; a random variation sequence of the transmitted ultrasonic intensity is measured and is calculated and analyzed, therefore, average particle diameter and concentration of particles are calculated through the ultrasonic pulsation principle. The method disclosed by the invention can realize online measurement; the method is applicable to laboratory scientific research, and is specifically applicable to the industrial field.

Description

technical field [0001] The invention relates to an ultrasonic detection technology, in particular to a method for measuring particle size and concentration based on the principle of ultrasonic pulsation. Background technique [0002] Particles refer to geometric objects with a specific shape within a certain size range, which can be solid, liquid, or gas, such as coal powder in power plant boilers, liquid droplets in steam turbines, dust in the atmosphere, red blood cells in blood, milk protein in etc. The particle size and concentration in the two-phase system are of great significance to modern industrial production such as energy, environment, materials, biology, chemical industry and other fields. Particles with suitable particle size and concentration in the production process can not only improve production efficiency and ensure product quality, but also save energy and reduce pollution emissions. [0003] Ultrasonic testing technology is a technology that uses ultra...

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Problems solved by technology

[0004] The present invention aims at the problems existing in the existing method of ultrasonic measurement of particle concentration, and proposes a method for measuring particle size and concentration based on the principle of ultrasonic pulsation. The incident ultrasonic wave is scattered and absorbed by the particle medium, and the intensity of the transmitted sound wave will attenuate. Focus the ultrasonic wave and arrange the measurement area in the focused ultrasonic beam section. When the ratio of the particle size to the focused ultrasonic beam diameter is controlled within the range of 0.1-20, the number and particle size of the particles passing through it change with time, and the transmitted sound intensity It will also fluctuate with time, resulting in the effect of acoustic pulsation. The random pulsation of the ultrasonic signal is related to the particle size and number in the measurement area of ​​the ultrasonic focused sound beam at the moment of measurement. The random change sequence of the transmitted ultrasonic intensity is measured and carried out. Statistical analysis, the average particle size and concentration of particles can be obtained by applying ultrasonic pulsation theory

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