Characterization of improved tactile sensors using piezoelectric resonator

Liquid-Level Sensing by Trapped-Energy-Mode Thickness Vibration

“…Various types of piezoelectric resonators have also been used extensively for sensing applications, such as tactile sensors. [4][5][6][7][8][9][10][11][12] Some of the sensors reported thus far have employed trapped-energy vibration modes to obtain high sensitivity by taking advantage of the high mechanical quality factor Q m that they can provide. 5,6,11) The objective of the present research is to put the spatial distribution of the evanescent field itself in trappedenergy vibration modes to practical use, and this should be a new approach in liquid-level sensing.…”