Flexible Passive Sensor Patch with Contactless Readout for Measurement of Human Body Temperature

Year: 2023

Authors: Zini M., Basch M., Nastro A., Ferrari M., Ferrari V.

Autors Affiliation: Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; INO CNR Natl Inst Opt Natl Res Council, Via Branze 45, I-25123 Brescia, Italy.

Abstract: A passive flexible patch for human skin temperature measurement based on contact sensing and contactless interrogation is presented. The patch acts as an RLC resonant circuit embedding an inductive copper coil for magnetic coupling, a ceramic capacitor as the temperature-sensing element and an additional series inductor. The temperature affects the capacitance of the sensor and consequently the resonant frequency of the RLC circuit. Thanks to the additional inductor, the dependency of the resonant frequency from the bending of the patch has been reduced. Considering a curvature radius of the patch of up to 73 mm, the maximum relative variation in the resonant frequency has been reduced from 812 ppm to 7.5 ppm. The sensor has been contactlessly interrogated by a time-gated technique through an external readout coil electromagnetically coupled to the patch coil. The proposed system has been experimentally tested within the range of 32-46 & DEG;C, giving a sensitivity of -619.8 Hz/& DEG;C and a resolution of 0.06 & DEG;C.

Journal/Review: Biosensors-Basel

Volume: 13 (6)      Pages from: 572-1  to: 572-10

KeyWords: body temperature sensor; coil-coupled sensor; passive sensor; RLC resonator; contactless; time-gated technique; autocorrelation
DOI: 10.3390/bios13060572

ImpactFactor: 4.900
Citations: 2
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24
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