Large-dynamic-range and high-resolution from a strain sensing system using long-period grating interrogating FBG strain sensor

Abstract

We have demonstrated both large-dynamic range (8100p~) and high-resolution ( 0 . 5~~) from a strain sensing system using a long-period grating interrogating a fibre Bragg grating sensor

Uniaxial fiber Bragg grating accelerometer system with temperature and cross axis insensitivity

“…Several techniques have been proposed along the last years, in particularly based on simple interferometry [11], Fabry-Perot filters [12], matched gratings [13], acoustic-optic tunable filters [14], long period gratings [15,16], Sagnac loops based on the chirped fiber Bragg gratings [17] or multi-port fiber Mach-Zehnder interferometer for multi sensors interrogation [18]. These solutions provide high resolution in the wavelength domain but are relatively complex systems with high implementation costs [3].…”

A simple strain sensor using polymer fiber Bragg grating and long-period fiber grating

“…The results display a large measurement range of 15000 µε with reasonably good linearity in our proposed sensing system. This strain range is nearly two times larger than that of the sensing configuration reported in [11]. For silica optical fiber, a maximum tensile strain of roughly 1% can be applied without degrading the fiber strength and eventually breaking the fiber [5].…”

An FBG-Based Impact Event Detection System for Structural Health Monitoring

“…Changes in the measurand are reflected as shift in the characteristic Bragg wavelength of an FBG. Light intensity demodulation techniques [11][12][13] have been shown to possess the required dynamic response for logging impact events [10,14,15]. In this work, two different light intensity demodulation schemes have been compared.…”