Numerical Analysis of the Hybrid Photonic Crystal Fiber and Single Mode Fiber/Fiber Bragg Grating Sensor for Simultaneous Measurement of Temperature and Strain

Abstract

In this paper we investigate the performance of a Fiber Bragg Grating (FBG) as a strain-optic and temperature sensor, using the Coupled Mode Theory (CMT) and the Transfer Matrix Method (TMM), through numerical simulation in an interrogation system with Single-Mode Fiber (SMF) and Photonic Crystal Fiber (PCF). Parameters such as sensitivity, bandwidth, peak power, peak wavelength and side-lobes power, were analyzed through the Bragg wavelength change depending on the simultaneous variation of strain and temperature. The FBG sensor proposed suffered thermal variation 25 °C to 200 °C and of strain of 0 μs to 1000 μs, excellent linearity was obtained for the variation of the Bragg wavelength with differences of 0.7 nm for each 50 °C and 0.245 nm for each 200.

Prototype of a sensor for simultaneous monitoring of water level and temperature of rivers in the Amazon using FBG

“…There is a very popular expression in the literature that relates the variation in Bragg wavelength to the physical parameters of strain με and temperature Δ T , such equation is described by (Othonos 1997 ; Kreuzer 2006 ; de Sousa et al 2019 ): where the first term of the second member of the Eq. ( 2 ) represents the deformation resulting from the applied force on the grating, is the effective photoelastic constant, ν is the Poisson's ratio, , are the components of the tensor photoelastic.…”

Design and simulation of liquid infiltrated photonic crystal fibre in terahertz frequencies

“…The terahertz (THz) spectral region covering between 0.1-10 THz in the electromagnetic spectrum is gaining traction in the research and development arena, due to its potential in providing novel solutions for the telecommunication, sensing, quality control, and medical industries [1][2][3][4][5]. Photonic Crystal Fibres (PCFs) are special-purpose optical fibres containing an array of geometrically structured air holes spanning across the fibre's longitudinal axis.…”