Tiny optical fiber temperature sensor based on temperature-dependent refractive index of zinc telluride film

摘要

The temperature-dependent refractive index of zinc telluride film can be used to develop a tiny, low cost and film-coated optical fiber temperature sensor. Pulse reference-based compensation technique is used to largely reduce the background noise which makes it possible to detect the minor reflectivity change of the film in different temperatures. The temperature sensitivity is 0.0034dB/°C and the background noise is measured to be 0.0005dB, so the resolution can achieve 0.2°C.