A Wireless Passive Sensor for pH Monitoring Employing Temperature Compensation

被引：0
|
作者：
Bhadra, S. [1 ]
Bridges, G. E. [1 ]
Thomson, D. J. [1 ]
Freund, M. S. [2 ]
机构：
[1] Univ Manitoba, Dept Elect & Comp Engn, Winnipeg, MB R3T 2N2, Canada
[2] Univ Manitoba, Dept Chem, Winnipeg, MB, Canada
来源：
2011 IEEE SENSORS | 2011年
基金：
加拿大自然科学与工程研究理事会;
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We present an integrated coupled-coil passive sensor for temperature compensated remote pH monitoring. The sensor is a RLC resonant circuit consisting of an inductive coil connected in parallel to a thermistor, a varactor and a pH combination electrode. pH variation of the solution changes the voltage-dependent capacitance and shifts the resonant frequency of the sensor, while temperature change of the solution affects the resistance and changes the quality factor. The resonant frequency and quality factor of the sensor are tracked remotely by an interrogator coil coupled to the sensor coil. A temperature range of 25 degrees C-60 degrees C and pH over a 2-12 dynamic range can be measured simultaneously. With temperature compensation, the accuracy of the pH measurement is demonstrated to be 0.1 pH. The sensor overcomes the pH measurement error due to the temperature dependence of electrode based passive pH sensors.
引用
收藏
页码：1522 / 1525
页数：4
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