Title :
Evaluation of natural spring water using automatic liquid measurement system with SH-SAW sensor
Author :
Kondoh, Jun ; Takahashi, Kazuhiro ; Matsui, Yoshikazu ; Shiokawa, Showko
Author_Institution :
Dept. of Syst. Eng., Shizuoka Univ., Japan
Abstract :
A surface acoustic wave (SAW) with a shear horizontal (SH) polarized displacement can work as a liquid-phase sensor. In this paper, we describe the evaluation of KI-index of natural spring waters using an automatic liquid measurement system with the SH-SAW sensor. The KI-index is determined from the concentration of calcium and sodium in water. Using the self-calibrating ratiometric method and an artificial neural network, the KI-index is estimated without any selective coatings for calcium and sodium. Furthermore, the optimization method for measuring water samples is discussed. The results indicate that the low frequency SH-SAW sensor has possibility to reduce the measuring time and high sensitive detection.
Keywords :
calcium; chemical sensors; sodium; surface acoustic wave sensors; water; H2O:Ca,Na; KI-index; SH-SAW sensor; artificial neural network; automatic liquid measurement system; liquid-phase sensor; natural spring water; self-calibrating ratiometric method; Acoustic measurements; Acoustic sensors; Acoustic waves; Artificial neural networks; Calcium; Polarization; Sensor phenomena and characterization; Sensor systems; Springs; Surface acoustic waves;
Conference_Titel :
Sensors, 2003. Proceedings of IEEE
Print_ISBN :
0-7803-8133-5
DOI :
10.1109/ICSENS.2003.1279083
