Temperature-compensation circuits for simple solution-concentration sensor with temperature compensation using bulk acoustic waves

Author

Ikeda, Kiyoshi

Author_Institution

Fac. of Eng., Shinshu Univ.

fYear

2005

fDate

29-31 Aug. 2005

Firstpage

84

Lastpage

92

Abstract

This paper describes the use of a temperature-compensation circuits for simple solution-concentration sensor with temperature compensation using bulk acoustic waves. We analyzed the design method of temperature-compensation circuit (TCC) in order to eliminate considerable effect temperature has on sound velocity in liquids. The design methods are derived on a temperature-compensation factor by using a Taylor series expansion of the equation for sound velocity, which is a function of concentration and temperature centered on a reference concentration and reference temperature. The phase-locked loop (PLLM) was applied to NaCl solutions of varying concentrations and shown to yield an accurate determination of concentration within plusmn0.024% independent of variations in temperature of plusmn1.3degC at approximately 25.0degC

Keywords

acoustic wave velocity; bulk acoustic wave devices; chemical sensors; compensation; phase locked loops; NaCl; Taylor series expansion; bulk acoustic waves; phase-locked loop; solution-concentration sensor; sound velocity; temperature compensation circuits; Acoustic sensors; Acoustic waves; Circuits; Design methodology; Equations; Liquids; Phase locked loops; Sensor phenomena and characterization; Taylor series; Temperature sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-9053-9

Type

conf

DOI

10.1109/FREQ.2005.1573907

Filename

1573907