Distributed Fiber-Optic Sensor for Dynamic Strain Measurement

A novel Brillouin-based distributed sensing technique is presented that can obtain the strain profile of the entire sensing fiber with a single optical pulse. Experimentally obtained spectra show that this comb excited pump signal is capable of strain and temperature measurement in a dynamic system....

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Bibliographic Details
Published in:IEEE sensors journal 2008-07, Vol.8 (7), p.1067-1072
Main Authors: Chaube, P., Colpitts, B.G., Jagannathan, D., Brown, A.W.
Format: Article
Language:English
Subjects:
Brillouin scattering
Capacitive sensors
Detection
Dynamical systems
Dynamics
Fiber optics
Fibers
Frequency measurement
Optical fiber polarization
Optical fiber sensors
Optical fiber testing
optical fiber transducers
Optical fibers
Optical pulses
Sea measurements
Sensors
Spatial resolution
Strain
Strain measurement
temperature measurement
Time measurement
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Description
Summary:A novel Brillouin-based distributed sensing technique is presented that can obtain the strain profile of the entire sensing fiber with a single optical pulse. Experimentally obtained spectra show that this comb excited pump signal is capable of strain and temperature measurement in a dynamic system. The results show the expected sinusoidal strain profile for a 12 s periodic strain cycle applied to the test fiber. The strain distribution for the entire fiber was obtained in 256 mus , thereby demonstrating for the first time, the potential to measure dynamic strains up to 3.9 kHz with 12 m resolution. Increased acquisition speed comes at the expense of achievable spatial resolution.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2008.926107