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Flexible Passive Sensor Patch with Contactless Readout for Measurement of Human Body Temperature
Marco Zini1, Marco Baù1,2, Alessandro Nastro1,2
1Department of Information Engineering, University of Brescia, 25123 Brescia, Italy.
Biosensors
|June 27, 2023
Summary
This study introduces a flexible skin temperature patch using an RLC resonant circuit. The passive patch enables accurate, contactless temperature measurement, reducing errors from bending.
Area of Science:
- * Materials Science
- * Electrical Engineering
- * Biomedical Engineering
Background:
- * Accurate human skin temperature monitoring is crucial for medical diagnostics and health management.
- * Existing methods often face challenges with flexibility, comfort, and contactless readout.
- * Flexible electronic sensors offer potential for improved wearable health monitoring solutions.
Purpose of the Study:
- * To develop a passive, flexible patch for accurate human skin temperature measurement.
- * To enable contactless interrogation of the temperature-sensing patch.
- * To minimize the impact of mechanical bending on measurement accuracy.
Main Methods:
- * A flexible patch designed as an RLC resonant circuit with a ceramic capacitor temperature sensor and inductive coil.
- * Incorporation of an additional series inductor to mitigate frequency shifts due to patch bending.
- * Contactless interrogation using a time-gated technique with an external readout coil.
- * Experimental validation of the sensor's performance in the 32-46 °C range.
Main Results:
- * The patch demonstrated reduced resonant frequency variation from 812 ppm to 7.5 ppm with bending (curvature radius up to 73 mm).
- * Achieved a sensitivity of -619.8 Hz/°C within the tested temperature range.
- * Demonstrated a high resolution of 0.06 °C for precise temperature readings.
- * Successful contactless interrogation confirmed the system's practical applicability.
Conclusions:
- * The developed passive flexible patch offers a promising solution for accurate, contactless skin temperature monitoring.
- * The design effectively minimizes bending-induced errors, enhancing reliability in wearable applications.
- * This technology has significant potential for non-invasive physiological monitoring in healthcare settings.
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