Abstract
We report here a low-cost evanescent field wave fiber optic temperature sensor. The amount of rays guided along the fiber probe is the result of the absorption of evanescent waves produced at the core-cladding interface. We systematically investigate the wavelength dependence of this sensor during the measurement of the temperature. The degree of variation with respect to the temperature is also determined by alteration of measuring liquid. We observe an enhanced responsivity of the fiber sensor towards a higher wavelength side. The sensor set-up offers simultaneous detection of refractive indices when correlated with temperature variation. All the results reported here bear a good repeatability.
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