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15 June 2023 Dynamic discrimination between temperature and strain in single-mode fiber using a hybrid Brillouin/Rayleigh-based sensor
Matthew J. Murray, Joseph B. Murray, Hannah M. Ogden, Brandon Redding
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Proceedings Volume 12532, Optical Waveguide and Laser Sensors II; 1253208 (2023) https://doi.org/10.1117/12.2661662
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States
Abstract
We present a distributed fiber optic sensor that discriminates between temperature and strain along a 500 m fiber with 5 m spatial resolution and a quasi-static temperature (strain) resolution of 15 mK (130 nɛ). The technique relies on a slope-assisted Brillouin system that combines gain and phase information from both the Stokes and anti-Stokes components and a frequency-scanning Rayleigh system that measures the shift in the Rayleigh backscattered spectrum. Uniquely, this hybrid approach enables dynamic measurements with a bandwidth of 1.7 kHz and temperature (strain) noise spectral density of 0.52 mK/√Hz (4.6 nɛ/√Hz), while suppressing cross sensitivity by 25 dB.
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Matthew J. Murray, Joseph B. Murray, Hannah M. Ogden, and Brandon Redding "Dynamic discrimination between temperature and strain in single-mode fiber using a hybrid Brillouin/Rayleigh-based sensor", Proc. SPIE 12532, Optical Waveguide and Laser Sensors II, 1253208 (15 June 2023); https://doi.org/10.1117/12.2661662
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KEYWORDS
Sensors
Single mode fibers
Fiber optics sensors
Spatial resolution
Temperature metrology
Geometrical optics
Reflectometry
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