Title :
Identification of ionic solutions using a liquid flow system with SH-SAW sensors
Author :
Kondoh, J. ; Furukawa, T. ; Matsui, Yusuke ; Shiokawa, S.
Author_Institution :
Fac. of Eng., Shizuoka Univ., Hamamatsu, Japan
Abstract :
A surface acoustic wave (SAW) propagates on 36° rotated Y-cut, X-propagating LiTaO3 is a pseudo mode with a shear horizontal polarized displacement (SH-SAW). Resent reports have shown that liquid-phase sensor using SH-SAW device can detect electrical properties of liquid with high sensitivity. This paper describes a novel technique for identifying the differences of ionic solutions by use of the SH-SAW sensor in a liquid flow system. The identification principle is based on the time responses of the samples obtained from the flow system. Several kinds of ionic solutions, such as aqueous solutions of HCl, LiCl, etc., are measured and observed evident difference in transient. Using pattern matching based on the transient responses, unknown samples are distinguished perfectly. Moreover, not only kind of ion but also conductivity and molar concentration are decided
Keywords :
chemical sensors; flow; liquids; solutions; surface acoustic wave sensors; HCl; LiCl; LiTaO3; aqueous solution; conductivity; electrical properties; ionic solution identification; liquid flow system; liquid-phase SH-SAW sensor; molar concentration; pattern matching; pseudo mode; rotated Y-cut X-propagating LiTaO3; shear horizontal surface acoustic wave; time response; transient response; Acoustic propagation; Acoustic sensors; Acoustic signal detection; Acoustic waves; Fluid flow; Polarization; Sensor phenomena and characterization; Sensor systems; Surface acoustic wave devices; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.583998
