Ultrasensitive temperature measurement using optical fiber Fabry-Perot interferometers

Abstract

In this paper, a Fabry-Perot interferometer filled with ultraviolet curing adhesive sensitization of high sensitivity fiber optic temperature sensor is proposed, by filling the F-P cavity with ultraviolet curing adhesive, due to the high coefficient of thermal expansion of the ultraviolet curing adhesive, the traditional fiber optic temperature sensor is achieved by primary sensitization. Combined with the optical vernier effect sensitization mechanism for secondary sensitization of the fiber optic Fabry-Perot interferometer, the sensor achieves a compact polymer-core sensing probe fiber optic interferometer structure and exhibits a temperature detection sensitivity of -17.55 nm/℃. This paper uses the F-P cavity peak phase spectral tracking algorithm for the vernier response spectrum collected by the vernier effect to obtain the peak spectral tracking and realise the high sensitivity detection.