期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 21, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/21/1/017002
关键词
structural health management; structural corrosion monitoring; fiber optic sensor network; fiber Bragg grating
资金
- Ministry of Education Science and Technology
- Program for Korea Research Institute of Standards and Science [KRISS-08-2402-221]
- Korea Ministry of Land, Transport and Maritime Affairs as Haneul Project
Corrosion deteriorates engineering structures, in particular large structures that are designed to have long lifetimes. This note describes a fiber optic Bragg gratings-based sensor head that enables monitoring of the corrosion of such structures. A corrosion-free fiber optic network can last longer than the lifetime of a given structure and has a remote sensing capability. Fiber Bragg gratings provide clear and reliable sensor responses and can be effectively implemented on a large structure due to their multiplexing capability. Many fiber optic corrosion sensors have been developed but most are environmental sensors. In order to monitor the corrosion of a target structure and not that of the sensor itself, the corrosion of a sacrificial plate made of a material identical to that of the target structure is monitored through Bragg wavelength release of a prestrained fiber Bragg grating installed on the sacrificial plate. The sensor head contains a corrosion-resistant casing for structural installation and a reference sensor for thermal effects compensation. The compensated Bragg wavelength shift determines the corrosion-induced loss in mass per unit of surface area of the target structure.
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