High temperature strain sensing with alumina ceramic derived fiber based Fabry-Perot interferometer

A Fabry-Perot interferometer (FPI) based on an alumina ceramic derived fiber (CDF) is proposed and demonstrated for high temperature strain sensing. The strain sensor is constructed by splicing a piece of CDF between two standard single-mode fibers (SMFs). The strain properties of the sensor are investigated from room temperature to 1200 degrees C. Experimental results show that the wavelength shift of the CDF-FPI presents a linear relationship with the tensile strain at both room temperature and high temperature with up to 1000 degrees C. The strain sensitivity is calculated to be 1.5 pm/mu epsilon at 900 degrees C, and the linear response is repeatable within 0-3000 mu epsilon. Moreover, for each applied force at 1000 degrees C, the wavelength shift versus time shows the stability of the developed CDF-FPI sensor within 0-2000 mu epsilon. The obtained results show that such a CDF-FPI has potential application in various engineering areas, such as aeronautics, metallurgy, and gas boiler. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.