Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Acoustic emission sensor system using a chirped fiber-Bragg-grating Fabry–Perot interferometer and smart feedback control

Abstract

We demonstrate a fiber-optic acoustic emission (AE) sensor system that is capable of performing AE detection, even when the sensor is experiencing large quasi-static strains. The sensor is a Fabry–Perot interferometer formed by cascaded chirped fiber-Bragg gratings (CFBGs). The reflection spectrum of the sensor features a number of narrow spectral notches equally spaced within the reflection bandwidth of the CFBG. A semiconductor laser whose wavelength can be fast tuned through current injection is used to lock the laser line to the center of a slope of a spectral notch. When the notch is knocked out of the tuning range of the laser, a neighboring notch moves into the range. Through a smart feedback control scheme, the laser is unlocked from the current spectral lock and relocked to the desired point of the new notch. The fast speed of the unlocking/relocking process (<1ms) ensures that the AE signal is monitored without significant disruption.

© 2017 Optical Society of America

Full Article  |  PDF Article
More Like This
Orientation-discriminating curvature sensor based on a chirped fiber Bragg grating Fabry–Perot interferometer

Xue-Peng Pan, Bo Wang, Qi Guo, Shan-Ren Liu, He-Er Yang, Cai Sun, Qi-Dai Chen, Hong-Bo Sun, and Yong-Sen Yu
Opt. Lett. 47(16) 4119-4122 (2022)

Linearly chirped tapered fiber-Bragg-grating-based Fabry–Perot cavity and its application in simultaneous strain and temperature measurement

Konrad Markowski, Kazimierz Jędrzejewski, Michał Marzęcki, and Tomasz Osuch
Opt. Lett. 42(7) 1464-1467 (2017)

Chirped fiber tip Fabry–Perot interferometer

Xinpu Zhang, Liyang Shao, Xihua Zou, Bin Luo, Wei Pan, and Lianshan Yan
Opt. Lett. 42(17) 3474-3477 (2017)

Supplementary Material (1)

NameDescription
Visualization 1: MOV (12651 KB)      Response of fiber-optic sensor system (yellow waveform on the oscilloscope) and the reference AE sensor system (purple waveform on the oscilloscope) when a 10 Hz dynamic background strain was applied on the fiber-optic sensor.

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved