Open AccessAn all fiber-optic multi-parameter structure health monitoring system
Author(s) -
Chennan Hu,
Zhihao Yu,
Anbo Wang
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.020287
Subject(s) - materials science , fiber bragg grating , optics , structural health monitoring , optical fiber , laser , fiber optic sensor , distributed acoustic sensing , multiplexing , optoelectronics , computer science , composite material , telecommunications , physics
In this work, we present an all fiber-optics based multi-parameter structure health monitoring system, which is able to monitor strain, temperature, crack and thickness of metal structures. This system is composed of two optical fibers, one for laser-acoustic excitation and the other for acoustic detection. A nano-second 1064 nm pulse laser was used for acoustic excitation and a 2 mm fiber Bragg grating was used to detect the acoustic vibration. The feasibility of this system was demonstrated on an aluminum test piece by the monitoring of the temperature, strain and thickness changes, as well as the appearance of an artificial crack. The multiplexing capability of this system was also preliminarily demonstrated.