期刊名称：International Journal on Smart Sensing and Intelligent Systems
印刷版ISSN：1178-5608
出版年度：2011
卷号：4
期号：02
页码：205-223
出版社：Massey University
摘要：Abstract- A novel ultrasonic dispersion system for the dispersing of particles which are
mixed in liquid has been proposed in this paper. The frequency of produced ultrasonic
wave varies from 30 kHz to 60 kHz with 100 Hz steps. It means that the operating
frequency band of designed system is 30 kHz. The maximum and optimum energy of
ultrasonic wave can be transfer inside the liquid container with the high efficiency in
majority of operating time by the use of some facilities which are implemented in our novel
system, so it causes one of the superiority of manufactured system in compare with the
other similar systems which are available in markets. Ultrasonic transducers which are
used in this system as the generator of ultrasonic wave is the type of air coupled ceramic
ultrasonic piezoelectric with the nominal maximum power 50 watt. By the considering of frequency diagram of applied piezoelectric, it can be find out that the piezoelectrics
produce the maximum amplitude of ultrasonic wave on their resonance frequency, so this
system is designed to work on resonance frequency of piezoelectric, continuously. This is
done by the use of control system which is consisted of two major parts, sensing part and
controlling part. A Hall Effect current sensor is used as the sensing part and the
controlling program is implemented on AVR microcontrollers. In addition, the control
algorithm of program is presented in this paper. The manufactured ultrasonic dispersion
system has been consisted of 9 piezoelectrics so that it can produce 450 watt ultrasonic
energy, totally.
关键词：Index terms: Ultrasonic dispersion; frequency adjusting; Transducer; high power ultrasonic; nano-;particles.
