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An all-fibre temperature sensor is proposed based on a macro-bend singlemode fibre loop using a ratiometric power measurement scheme. The sensor has a linear characteristic with temperature at a fixed wavelength and bend radius. A direct linear relationship between the bend loss of the singlemode fibre and temperature is reported for the first time. By measuring the change in bend loss of the system a change in temperature can be measured assuming the system is calibrated. The proposed sensor has a higher temperature resolution than other conventional fibre-optic sensors and also benefits from simplicity.
Rajan, G., Semenova, Y., Farrell, G.: An all-fiber temperature sensor based on a macro-bend singlemode fiber loop. Electronic Letters, Vol.44, no. 19, pp1123-1124. 2008. doi:10.1049/el:20081233