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A Novel Infrared Temperature Measurement with Dual Mode Modulation of Thermopile Sensor
Chih-Hsiung Shen1, Shu-Jung Chen2, Yi-Ting Guo3
1Department of Mechatronics Engineering, National Changhua University of Education, Changhua City 50074, Taiwan. hilbert@cc.ncue.edu.tw.
Abstract:
Superior to the traditional infrared temperature sensing architecture including infrared sensor and thermistor, we propose a novel sensing approach based on a single thermopile sensor with dual modes modulation. A switching and sensing circuit is proposed and realized with a chopper amplifier AD8551 and p-channel MOSFET (PMOS) for switching between detection of thermal radiation and the target and the ambient temperature for compensation. The error of target temperature after temperature compensation is estimated at less than 0.14 °C.
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