Fiber optic temperature sensors using light emitting diodes

In the present work the results which have been obtained to explore the possibility of using light emitting diodes as temperature sensors are reported. Experiments have been performed with light emitting diodes (LEDs) of different types in order to measure the electroluminescent spectra and thereby to identify the material from which the device is fabricated. Temperature aging of LEDs is carried out so as to find their suitability as temperature sensors. In order to use LEDs as temperature sensors, they should have large power output change with temperature. From the experimental results presented it was observed that GaP:Zn,O red LEDs seem to be suitable as temperature sensors.