Multidimensional dynamic displacement and strain measurement using an intensity demodulation-based fiber bragg grating sensing system
Journal
Journal of Lightwave Technology
Journal Volume
28
Journal Issue
13
Start Page
1897
End Page
1905
ISSN
07338724
15582213
Date Issued
2010
Author(s)
Ma, Chien-Ching
Abstract
We set up a multidimensional dynamic fiber Bragg grating (FBG) displacement and strain sensing system. The proposed sensing system allows the FBGs to have the ability to measure transient point-wise displacement (in-plane and out-of-plane) and strain responses simultaneously with high sensitivity. The sensing system employs a long-period fiber grating filter and two FBG filters to dynamically demodulate the responses of the FBG sensors. To demonstrate the dynamic sensing ability and the application of the proposed system, the transient elastic wave propagation in a solid subjected to vertical and lateral impact loadings are investigated. A laser Doppler vibrometer is employed in our experiments simultaneously to verify the transient responses of out-of-plane particle transient motions measured by the out-of-plane FBG displacement sensor. The in-plane displacement measurement ability is demonstrated by the responses obtained by two geometrically orthogonal in-plane FBG displacement sensors. Dynamic strain sensing ability of our all-fiber sensing system is also demonstrated. The experimental results both in time domain and frequency domain show that the proposed FBG sensing system is capable of performing real-time displacement (out-of-plane and in-plane) and strain measurements.
Subjects
Fiber Bragg Grating (fbg) Sensors
In-plane Displacement Sensors
Laser Doppler Vibrometers (ldv)
Long-period Fiber Grating (lpfg) Filters
All Fiber
Displacement Sensor
Dynamic Displacements
Dynamic Sensing
Dynamic Strain
Fbg Sensing
Fbg Sensor
Fiber Bragg Grating (fbg)
Fiber Bragg Grating Sensing System
Fiber Bragg Grating Sensor
Frequency Domains
High Sensitivity
In-plane
In-plane Displacement
In-plane Displacement Measurement
Intensity Demodulation
Laser Doppler Vibrometers
Lateral Impact
Long Period Fiber Grating
Out-of-plane
Sensing Systems
Strain Response
Strain Sensing Systems
Time Displacements
Time Domain
Transient Elastic Waves
Transient Motions
Transient Response
Classifiers
Diffraction Gratings
Doppler Effect
Elastic Waves
Fiber Bragg Gratings
Fiber Optic Components
Fiber Optic Sensors
Fibers
Laser Doppler Velocimeters
Strain Gages
Strain Measurement
Transient Analysis
Wave Propagation
Sensors
Type
journal article