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Particle Monitoring Using Ultrasound in the Gas Flow  

Jhang Kyung-young (한양대학교 기계공학부)
Kim Joo-chul (한양대학교 정밀기계공학과 대학원)
Kim Hong-jun (한양대학교 정밀기계공학과 대학원)
Hwang Won-ho (포항산업과학연구원(RIST) 기전연구팀)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.10, 2004 , pp. 78-85 More about this Journal
Abstract
The particle amount monitoring technique using ultrasound is proposed to determine the proper maintenance time of the filter in the supply process of pure gas in the unit of oxygen plant. There are advantages that it is adaptable in high temperature and high pressure, and it is not disturbed by being exposed in the gas flow, and it can be implemented very economically. The applicability of the ultrasonic technique is pre-studied through the theoretical analysis for the dependency of attenuation of ultrasonic wave on the particles in the gas flow. For the purpose, absorption, scattering and dispersion models are considered, and the attenuation by absorption and the change rate of the propagation speed are calculated fur the specific range of particle size and the ultrasonic wave frequency. It was expected by simulation that the absorptive attenuation by particles was the most sensitive to the change of particle amount. The experimental result showed high correspondence with the theoretical expectation so that this ultrasound attenuation measurement was proved to be highly effective for monitoring the amount of floating particles in the gas flow.
Keywords
Ultrasound; Particle Monitoring; Absorptive Attenuation; Scattering;
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