Title :
Temperature-compensation circuits for simple solution-concentration sensor with temperature compensation using bulk acoustic waves
Author_Institution :
Fac. of Eng., Shinshu Univ.
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;
Conference_Titel :
Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-9053-9
DOI :
10.1109/FREQ.2005.1573907
