A Novel Infrared Temperature Measurement with Dual Mode Modulation of Thermopile Sensor

Chih-Hsiung Shen; Shu-Jung Chen; Yi-Ting Guo

doi:10.3390/s19020336

A Novel Infrared Temperature Measurement with Dual Mode Modulation of Thermopile Sensor

Sensors (Basel). 2019 Jan 15;19(2):336. doi: 10.3390/s19020336.

Authors

Chih-Hsiung Shen¹, Shu-Jung Chen², Yi-Ting Guo³

Affiliations

¹ Department of Mechatronics Engineering, National Changhua University of Education, Changhua City 50074, Taiwan. hilbert@cc.ncue.edu.tw.
² Department of Mechatronics Engineering, National Changhua University of Education, Changhua City 50074, Taiwan. sjchen@cc.ncue.edu.tw.
³ Department of Mechatronics Engineering, National Changhua University of Education, Changhua City 50074, Taiwan. M0751010@mail.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.

Keywords: CMOS-MEMS; modulation; switching; thermopile.

Grants and funding

MOST 107-2221-E-018-012/Ministry of Science and Technology, Taiwan