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Proceedings Paper

Sensitivity enhancement of fiber optic FBG sensor for acoustic emission
Author(s): Dae-Cheol Seo; Dong-Jin Yoon; Il-Bum Kwon; Seung-Suk Lee
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Paper Abstract

A fiber optic Bragg grating based acoustic emission sensor system is developed to provide on-line monitoring of cracks or leaks in reactor vessel head penetration of nuclear power plants. Various type of fiber Bragg grating sensor including the variable length of sensing part was fabricated and prototype sensor system was tested by using PZT pulser and pencil lead break sources. In this study, we developed a cantilever type fiber sensor to enhance the sensitivity and to resonant frequency control. Two types of sensor attachment were used. First, the fiber Bragg grating sensor was fully bonded to the surface using bonding agent. Second one is that one part of fiber was partially bonded to surface and the other part of fiber will be remained freely. The resonant frequency of the fiber Bragg grating sensor will depend on the length of sensing part. Various kinds of resonant type fiber Bragg grating acoustic emission sensors were developed. Also several efforts were done to enhance the sensitivity of FBG AE sensor, which include FBG spectrum optimization and electrical and optical noise reduction. Finally, based on the self-developed acquisition system, a series of tests demonstrate the ability of the developed fiber sensor system to detect a pencil lead break event and continuous leak signal.

Paper Details

Date Published: 8 April 2009
PDF: 10 pages
Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 729415 (8 April 2009); doi: 10.1117/12.821516
Show Author Affiliations
Dae-Cheol Seo, Korea Research Institute of Standards and Science (Korea, Republic of)
Dong-Jin Yoon, Korea Research Institute of Standards and Science (Korea, Republic of)
Il-Bum Kwon, Korea Research Institute of Standards and Science (Korea, Republic of)
Seung-Suk Lee, Korea Research Institute of Standards and Science (Korea, Republic of)


Published in SPIE Proceedings Vol. 7294:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009
H. Felix Wu; Aaron A. Diaz; Peter J. Shull; Dietmar W. Vogel, Editor(s)

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