Sensors 2010, 10(6), 5975-5993; doi:10.3390/s100605975
Article

A Fiber Optic Doppler Sensor and Its Application in Debonding Detection for Composite Structures

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Received: 30 April 2010; in revised form: 20 May 2010 / Accepted: 29 May 2010 / Published: 14 June 2010
(This article belongs to the Special Issue Intelligent Sensors - 2010)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Debonding is one of the most important damage forms in fiber-reinforced composite structures. This work was devoted to the debonding damage detection of lap splice joints in carbon fiber reinforced plastic (CFRP) structures, which is based on guided ultrasonic wave signals captured by using fiber optic Doppler (FOD) sensor with spiral shape. Interferometers based on two types of laser sources, namely the He-Ne laser and the infrared semiconductor laser, are proposed and compared in this study for the purpose of measuring Doppler frequency shift of the FOD sensor. Locations of the FOD sensors are optimized based on mechanical characteristics of lap splice joint. The FOD sensors are subsequently used to detect the guided ultrasonic waves propagating in the CFRP structures. By taking advantage of signal processing approaches, features of the guided wave signals can be revealed. The results demonstrate that debonding in the lap splice joint results in arrival time delay of the first package in the guided wave signals, which can be the characteristic for debonding damage inspection and damage extent estimation.
Keywords: Fiber optic Doppler sensor; guided wave; debonding damage detection; composite structures
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MDPI and ACS Style

Li, F.; Murayama, H.; Kageyama, K.; Meng, G.; Ohsawa, I.; Shirai, T. A Fiber Optic Doppler Sensor and Its Application in Debonding Detection for Composite Structures. Sensors 2010, 10, 5975-5993.

AMA Style

Li F, Murayama H, Kageyama K, Meng G, Ohsawa I, Shirai T. A Fiber Optic Doppler Sensor and Its Application in Debonding Detection for Composite Structures. Sensors. 2010; 10(6):5975-5993.

Chicago/Turabian Style

Li, Fucai; Murayama, Hideaki; Kageyama, Kazuro; Meng, Guang; Ohsawa, Isamu; Shirai, Takehiro. 2010. "A Fiber Optic Doppler Sensor and Its Application in Debonding Detection for Composite Structures." Sensors 10, no. 6: 5975-5993.

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