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Sensors 2011, 11(12), 11605-11628; doi:10.3390/s111211605
Article

Dynamic Sensing Performance of a Point-Wise Fiber Bragg Grating Displacement Measurement System Integrated in an Active Structural Control System

1
,
2
 and
2,*
1 School of Aeronautics and Astronautics, Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China 2 Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan
* Author to whom correspondence should be addressed.
Received: 17 October 2011 / Revised: 28 November 2011 / Accepted: 3 December 2011 / Published: 13 December 2011
(This article belongs to the Special Issue Optical Fiber Sensors)

Abstract

In this work, a fiber Bragg grating (FBG) sensing system which can measure the transient response of out-of-plane point-wise displacement responses is set up on a smart cantilever beam and the feasibility of its use as a feedback sensor in an active structural control system is studied experimentally. An FBG filter is employed in the proposed fiber sensing system to dynamically demodulate the responses obtained by the FBG displacement sensor with high sensitivity. For comparison, a laser Doppler vibrometer (LDV) is utilized simultaneously to verify displacement detection ability of the FBG sensing system. An optical full-field measurement technique called amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) is used to provide full-field vibration mode shapes and resonant frequencies. To verify the dynamic demodulation performance of the FBG filter, a traditional FBG strain sensor calibrated with a strain gauge is first employed to measure the dynamic strain of impact-induced vibrations. Then, system identification of the smart cantilever beam is performed by FBG strain and displacement sensors. Finally, by employing a velocity feedback control algorithm, the feasibility of integrating the proposed FBG displacement sensing system in a collocated feedback system is investigated and excellent dynamic feedback performance is demonstrated. In conclusion, our experiments show that the FBG sensor is capable of performing dynamic displacement feedback and/or strain measurements with high sensitivity and resolution.
Keywords: fiber Bragg grating; sensing system; out-of-plane; point-wise displacement sensor; amplitude-fluctuation electronic speckle pattern interferometry; smart cantilever beam; velocity feedback control fiber Bragg grating; sensing system; out-of-plane; point-wise displacement sensor; amplitude-fluctuation electronic speckle pattern interferometry; smart cantilever beam; velocity feedback control
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.

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Chuang, K.-C.; Liao, H.-T.; Ma, C.-C. Dynamic Sensing Performance of a Point-Wise Fiber Bragg Grating Displacement Measurement System Integrated in an Active Structural Control System. Sensors 2011, 11, 11605-11628.

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