In-fibre Bragg grating temperature sensor system for medical applications

Rao, Yun-Jiang; Webb, David J.; Jackson, David A.; Zhang, Lin and Bennion, Ian (1997). In-fibre Bragg grating temperature sensor system for medical applications. Journal of lightwave technology, 15 (5), pp. 779-785.


A novel quasidistributed in-fiber Bragg grating (FBG) temperature sensor system has been developed for temperature proving 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.

Uncontrolled Keywords: Michelson interferometers, arrays, biomedical equipment, diffraction gratings, fibre optic sensors, hyperthermia, monochromators, temperature sensors, wavelength division multiplexing, 30 to 60 degC, FBG sensor array, FBG temperature sensors, accuracy, crosstalk-free wavelength-division-multiplexing, demultiplexing, drift-compensated interferometric detection, high-resolution detection, human body, hyperthermia treatment, in vivo, in-fiber Bragg-grating temperature sensor system, medical applications, protection sleeve, quasidistributed in-fiber Bragg grating, resolution, return signals, sensor head design, simple monochromator, strain-free probe, superluminescent diode, temperature changes, temperature proving, wavelength-shifts
Published Date: 1997-05


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