Title :
Precise estimation of viscosity of liquid using leaky surface acoustic waves propagating along liquid/polymer/LiNbO3 structures
Author :
Furukawa, Shoji ; Furukawa, Hiroshi ; Nomura, Tooru ; Yasuda, Tsutomu ; Tamura, Minoru
Author_Institution :
Dept. of Comput. Sci. & Electron., Kyushu Inst. of Technol., Fukuoka, Japan
Abstract :
A surface acoustic wave (SAW) propagating on a LiNbO3 substrate has a large shear horizontal (SH) displacement. However, it is not possible to make a good estimate of the viscosity using the substrate for the case of the small viscosity liquids, such as water, because the propagation loss is relatively large. The polymer film/LiNbO 3 structure is proposed for the leaky SAW substrate. By using this substrate, an almost perfect SH mode can be attained. The loss is caused principally by the viscous coupling. Consequently, the viscosity coefficient can be well estimated even in the case of water
Keywords :
electric sensing devices; surface acoustic wave devices; viscometers; viscosity measurement; LiNbO3; LiNbO3 substrate; leaky surface acoustic waves; liquid-polymer-piezoelectric structures; shear horizontal mode; viscosity coefficient; viscosity of liquid; viscous coupling; Acoustic propagation; Acoustic waves; Equations; Polymer films; Propagation losses; Solids; Substrates; Surface acoustic waves; Surface waves; Viscosity;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275991
