In-fibre Bragg grating temperature sensor system for medical applications

Yun-Jiang Rao, David J. Webb, David A. Jackson, Lin Zhang, Ian Bennion

Research output: Contribution to journalArticlepeer-review


A novel quasidistributed in-flber Bragg grating (FBG) temperature sensor system has been developed for temperature profiling in vivo in the human body for medical applications, e.g., hyperthermia treatment. This paper provides the operating principle of FBG temperature sensors and then the design of the sensor head. High-resolution detection of the wavelength-shifts induced by temperature changes are achieved using drift-compensated interferometric detection while the return signals from the FBG sensor array are demultiplexed with a simple monochromator which offers crosstalk-free wavelength-division-multiplexing (WDM). A "strain-free" probe is designed by enclosing the FBG sensor array in a protection sleeve. A four FBG sensor system is demonstrated and the experimental results are in good agreement with those obtained by traditional electrical thermocouple sensors. A resolution of 0.1°C and an accuracy of ±0.2°C over a temperature range of 30-60°C have been achieved, which meet established medical requirements.

Original languageEnglish
Pages (from-to)779-785
Number of pages7
JournalJournal of Lightwave Technology
Issue number5
Publication statusPublished - May 1997


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