Improved method for measuring particle size and concentration of solid particles on the basis of ultrasonic attenuation spectrum principle
A technology of solid particles and attenuation spectrum, which is applied in particle and sedimentation analysis, measuring devices, particle size analysis, etc., and can solve problems such as ultrasonic attenuation spectrum errors
Active Publication Date: 2015-08-12
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
However, the existing model only considers the ultrasonic attenuation caused by the absorption and scattering of ultrasonic waves by the medium, ignores the influence of the size of the ultrasonic receiving transducer on ultrasonic reception, and causes errors in the theoretical and experimental ultrasonic attenuation spectra. The Monte Carlo method corrects the calculation results of the theoretical model, thereby inventing an improved ultrasonic attenuation spectrum measurement method for particle size and concentration
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[0039] The present invention is aimed at the problems existing in the existing method of ultrasonic measurement of particle concentration. For the known geometrical dimensions of ultrasonic transducers, a Monte Carlo method is used to improve the theoretical model, calculate the ultrasonic attenuation spectrum, and then analyze the original Theoretical predictions were corrected to realize an improved ultrasonic attenuation spectroscopy method for measuring particle size and concentration.
[0040] This method is implemented as follows:
[0041] 1), such as figure 1 As shown, the ultrasonic transmitting transducer excites a beam of pulsed ultrasonic waves under the action of the excitation circuit, and the ultrasonic receiving transducer is arranged at a distance L, and the ultrasonic transmitting transducer reaches the area of the receiving transducer, that is, the measurement area. In the case that there are no particles in the measurement area, the sound absorption of th...
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An improved method for measuring the particle size and concentration of solid particles in a gas or liquid medium on the basis of an ultrasonic attenuation spectrum principle comprises the following steps: (1) assuming a solid particle system with an average radius of R and a volumetric concentration of Cv in a measurement zone, and calculating to obtain an ultrasonic attenuation spectrum alpha(f), wherein the unit is neper / meter, and the f represents the ultrasonic frequency; (2) calculating the extinction coefficient Kext; (3) judging whether the phonon is absorbed or scattered; (4) calculating the emergence angle of phonon scattering; (5) calculating the objective function to obtain the particle average radius (R) and volumetric concentration (Cv).
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 attenuation spectrum. Background technique [0002] A particle refers to a geometric body with a specific shape within a certain size range and in a segmented state, which can be solid, liquid, or gas. The particle size and concentration of solid particles 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 ultrasonic waves for various detection and measurement. The propagation law of ultrasonic waves in ...
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Login to View More IPC IPC(8): G01N15/02G01N15/06
Inventor 苏明旭蔡小舒郭盼盼
Owner UNIV OF SHANGHAI FOR SCI & TECH