Title :
Liquid-level sensing by trapped-energy mode of backward-wave-type thickness vibration
Author :
Yamada, Ken ; Seto, Shuichi
Author_Institution :
Grad. Sch. of Eng., Tohoku Gakuin Univ., Miyagi, Japan
Abstract :
The authors have presented a new technique that employs a piezoelectric thickness vibrator operating in a trapped energy mode for detecting a small-scale variation in liquid level. In this study, the feasibility of applying backward-wave-type energy trapping to liquid level sensing is investigated. It has been found that backward-wave-type energy trapping shows a sensing property slightly different from those obtained using conventional trapped-energy modes. Gradual variations in resonance characteristics with liquid level have been observed for backward-wave-type energy trapping when the liquid surface is in the surrounding electroded region.
Keywords :
backward wave tubes; electric sensing devices; level measurement; piezoelectric devices; backward wave type thickness vibration; liquid level sensing; piezoelectric thickness vibrator; resonance characteristics; sensing property; small scale variation; trapped energy mode; Acoustics; Charge carrier processes; Dispersion; Electrodes; Resonant frequency; Sensors; Vibrations; Backward-wave mode; Energy-trapping; Liqid level sensor; Piezoelectric resonator; Piezoelectric sensor;
Conference_Titel :
Ultrasonics Symposium (IUS), 2010 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-0382-9
DOI :
10.1109/ULTSYM.2010.5935607
