Leandro González, DanielBravo Acha, MikelOrtigosa Cayetano, AmaiaLópez-Amo Sáinz, Manuel2019-12-232019-12-232015D. Leandro, M. Bravo, A. Ortigosa and M. Lopez-Amo, 'Real-Time FFT Analysis for Interferometric Sensors Multiplexing,' in Journal of Lightwave Technology, vol. 33, no. 2, pp. 354-360, 15 Jan.15, 2015.0733-872410.1109/JLT.2014.2388134https://academica-e.unavarra.es/handle/2454/35956In this paper, a theoretical and experimental study of two interferometric sensor multiplexing schemes has been carried out by means of the fast Fourier transform (FFT) analysis. This work addresses one of the main drawbacks of photonic crystal fiber (PCF) sensors, that is, its multiplexing capability. Using a commercial optical interrogator combined with a simple FFT measurement technique, the simultaneous real-time monitoring of several PCF sensors is achieved. A theoretical analysis has been performed where simulations matched with the experimental results. For the experimental verification, highly birefringent (HiBi) fiber sections that operated as sensing elements were multiplexed and tested in two configurations. Due to the FFT analysis, both multiplexing schemes can be properly interrogated by monitoring the FFT phase change at the characteristic spatial-frequency of each sensor. For this purpose a commercial interrogator and a custom Matlab program were used for computing the FFT and for monitoring the FFT phase change in real-time (1 Hz).7 p.application/pdfeng© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other workFiber loop mirror (FLM)Fourier transformsMultiplexingOptical fiber sensorsPhotonic crystal fiber (PCF)info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess