Title :
Research on APM device for liquid dielectric constant sensing
Author :
Yao Min ; Chen Zhijun ; Zhao Min ; Mengyang Wang
Author_Institution :
College of automation engineering, Nanjing university of aeronautics and astronautics, China
Abstract :
Compare to SAW (surface acoustic wave) device, APM (acoustic plate mode wave) device is more suitable for liquid sensing. In this paper, the theoretical model of APM device loaded with non-viscous liquid is built using the propagation characteristics of acoustic wave in laminated mediums. It´s proved the influence of liquid mechanical parameters can be eliminated if the APM has only SH(shear-horizontal) particle displacement. Therefore, when the liquid is non-viscous and non-conductive, only the dielectric constant of the liquid would affect the propagation velocity of SH-APM device. According to the simulation results, two APM devices with different substrates (PZT-5H and LiNbO3) are fabricated and tested.
Keywords :
Boundary conditions; Couplings; Dielectric constant; Dielectric liquids; Liquids; Sensors; Substrates; APM wave; liquid dielectric constant; non-viscous liquid;
Conference_Titel :
Ultrasonics Symposium (IUS), 2012 IEEE International
Conference_Location :
Dresden, Germany
Print_ISBN :
978-1-4673-4561-3
DOI :
10.1109/ULTSYM.2012.0186
