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Title
Japanese: 
English:Reference-free calibration for wearable core body temperature sensor based on single heat flux method 
Author
Japanese: 橋本優生, 多田壮翔, 西田佳史.  
English: Yuki Hashimoto, Soto Tada, Yoshifumi Nishida.  
Language English 
Journal/Book name
Japanese: 
English:IEEE Sensors Letters 
Volume, Number, Page Vol. 8    No. 8    pp. 1-4
Published date July 30, 2024 
Publisher
Japanese: 
English:IEEE 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1109/LSENS.2024.3435965
 
DOI https://doi.org/10.1109/LSENS.2024.3435965
Abstract Core body temperature (CBT) is one of the useful physiological indicators that is linked to physiological changes. Wearable sensors are expected to be developed to monitor CBT easily during activities. Single heat flux method is one of the non-invasive techniques that estimates CBT by measuring heat flow changes near the skin with temperature sensors. The method requires calibrating parameters for estimating CBT in advance by comparing them with reference values obtained through another method. The invasive measurement method is generally used to obtain the reference values, which poses a challenge in terms of measurement burden. Here, we propose a new calibration method that does not require acquiring reference values. This method identifies calibration parameters based on the temperature history after the measurement probe is attached. It has been numerically and experimentally confirmed that the estimation accuracy by the method is equivalent to that of a general-purpose electronic thermometer. This outcome decreases the measurement workload in CBT measurement using the single heat flux method and significantly enhances its usability.

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