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Wireless Temperature Sensor Operating in Complete Metallic Environment Using Permanent Magnets

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2 Author(s)
Gupta, L.A. ; Birck Nanotechnol. Center, Purdue Univ., West Lafayette, IN, USA ; Peroulis, D.

This paper presents the first wireless temperature sensor operating in a complete metallic environment using permanent rare-earth magnets. The sensor is based on change in magnetic field strength with temperature, which is detected using commercially available Hall Effect sensors. Temperature of a hot plate at a distance of 19 mm in air and through a 9.5-mm-thick nonmagnetic austenitic stainless steel plate is successfully detected from 5 °C to 80 °C as a proof-of-concept demonstration. The curve fit values show excellent response with R2 value greater than 98% for both the cases.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )