A point-wise fiber bragg grating sensor to measure the vibration of a cantilever plate subjected to impact loadings
Journal
IEEE Sensors Journal
Journal Volume
11
Journal Issue
9
Start Page
2113
End Page
2121
ISSN
1530437X
Date Issued
2011
Author(s)
Ma, Chien-Ching
Abstract
In this paper, an out-of-plane point-wise fiber Bragg grating (FBG) displacement sensing system is proposed and the application of the FBG sensor is extended for modal analysis of a cantilever plate with highly accurate dynamic measurement results. From the proposed FBG sensing system, the relationships between mode shapes and transient displacement responses of the cantilever plate subjected to impact loadings are discussed in detail. By comparing with a laser Doppler vibrometer (LDV) simultaneously, the proposed FBG displacement sensing system demonstrates extremely high sensitivity and resolution. A long-period fiber grating (LPFG) filter-based wavelength-optical intensity modulation technique is employed to demodulate the responses of the FBG. By employing the fast Fourier transform on the measured transient displacement responses, the resonant frequencies of the cantilever plate are determined. An optical full-field measurement technique called amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) and FEM numerical calculations are also used to provide full-field vibration mode shapes and resonant frequencies of the cantilever plate. Finally, the amplitude of the frequency spectrums obtained from FBG and LDV are emphasized from the mode shapes and impact locations. The experimental results show that the proposed FBG displacement sensor is able to measure transient out-of-plane point-wise displacement responses and can also be used to determine the resonant frequencies of the cantilever plate.
Subjects
Bragg Gratings
Dynamics
Optical Fiber Sensors
Vibrations
Cantilever Plate
Displacement Response
Displacement Sensing
Displacement Sensor
Dynamic Measurement
Electronic Speckle Pattern Interferometry
Fbg Sensing
Fbg Sensor
Fiber Bragg Grating (fbg)
Fiber Bragg Grating Sensors
Filter-based
Frequency Spectra
Full-field
Full-field Measurement Technique
High Sensitivity
Impact Loadings
Intensity Modulations
Laser Doppler Vibrometers
Long Period Fiber Grating
Mode Shapes
Numerical Calculation
Optical Fiber Sensors
Out-of-plane
Vibration Modes
Electric Sensing Devices
Fast Fourier Transforms
Fiber Optic Components
Fiber Optic Sensors
Fibers
Laser Doppler Velocimeters
Modal Analysis
Modulation
Nanocantilevers
Natural Frequencies
Sensors
Transient Analysis
Vibration Analysis
Vibration Measurement
Fiber Bragg Gratings
Type
journal article