A large range temperature sensor based on an angled fiber end

We proposed a simple structure optical fiber temperature sensor, which is easy to be fabricated and used. The fiber sensor is made by polishing the optical fiber end to be 30° angle and its operating principle is based on Michelson interferometer. In order to demonstrate the performance of the fabricated temperature sensor, we carried out low temperature experiment (−40 °C-140 °C) and high temperature experiment (250 °C-900 °C) with two different kinds of thermostats. The results show us that the temperature sensitivity of the sensor increases with increasing temperature both in the low temperature range (−40 °C-140 °C) and in the high temperature range (250 °C-900 °C). The measured temperature sensitivity is 9.5 pm/°C at −40 °C and the measured temperature sensitivity is 17.86 pm/°C at 900 °C.