Ultrasonic attenuation spectrum based mixed solid particle size and concentration measurement method

A technology of solid particle and attenuation spectrum, applied in particle and sedimentation analysis, measuring device, particle size analysis, etc.

Inactive Publication Date: 2015-08-19
UNIV OF SHANGHAI FOR SCI & TECH
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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 of modeling the mixed particle system through the Monte Carlo method, calculating the theoretical ultrasonic attenuation spectrum,...

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  • Ultrasonic attenuation spectrum based mixed solid particle size and concentration measurement method
  • Ultrasonic attenuation spectrum based mixed solid particle size and concentration measurement method
  • Ultrasonic attenuation spectrum based mixed solid particle size and concentration measurement method

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Embodiment Construction

[0045] The present invention is aimed at the problems existing in the existing methods of ultrasonic measurement of particle concentration. For the known geometric dimensions of ultrasonic transducers, a theoretical model is established by the Monte Carlo method to calculate the ultrasonic attenuation spectrum, thereby realizing an ultrasonic Attenuation spectroscopy is a method for measuring the particle size and concentration of mixed particles in a liquid medium.

[0046] This method is implemented as follows:

[0047] 1), such as figure 1 As shown, under the action of the excitation circuit, the ultrasonic transmitting transducer T1 emits a beam of pulsed ultrasonic waves, and the ultrasonic receiving transducer R1 is arranged at a distance L, and the area between the ultrasonic transmitting transducer and the receiving transducer is the measurement area. In the case that there are no particles in the measurement area, the sound absorption of the continuum is ignored, and...

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Abstract

The invention relates to an ultrasonic attenuation spectrum principle based method for measuring the average particle size and concentration of two types of mixed solid particles in a liquid or gas medium. The ultrasonic attenuation spectrum principle based method comprises the following steps of step 1, measuring an experimental measurement ultrasonic attenuation spectrum alpha (f) under the condition that the two types of solid particles A and B are located in a measurement area, wherein f is the ultrasonic frequency; step 2, calculating an acoustic attenuation coefficient Kext of the particle and acoustic wave effect; step 3, determining whether the particles are A particles or B particles and determining whether phonons are absorbed or scattered through the acoustic attenuation coefficient; step 4, calculating a scattering emergence angle theta M1 of the scattered phonons; step 5, continuing to calculate a theoretical ultrasonic attenuation spectrum through a result of the step 4; step 6, establishing an objective function according to the theoretical ultrasonic attenuation spectrum and the experimental measurement ultrasonic attenuation spectrum to solve the particle size and volume concentration. The ultrasonic attenuation spectrum based mixed solid particle size and concentration measurement method can be applied to the two types of mixed solid particles and laboratory scientific research and the online measurement and the application of the industrial field can be implemented.

Description

technical field [0001] The invention relates to an ultrasonic detection technology, in particular to a method for measuring the particle size and concentration of solid mixed particles in a liquid or gas medium based on the principle of ultrasonic attenuation spectrum. Background technique [0002] A particle refers to a geometric body with a specific shape and in a segmented state within a certain size range, which can be solid, liquid, or gas. The object of the present invention is solid particles, such as solid particles in coal-water slurry for combustion, chemical reaction Solid crystals 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...

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Application Information

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IPC IPC(8): G01N15/02G01N15/06
Inventor 苏明旭蔡小舒李运思
Owner UNIV OF SHANGHAI FOR SCI & TECH
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