TY - JOUR
T1 - Temperature measurement and damage detection in concrete beams exposed to fire using PPP-BOTDA based fiber optic sensors
AU - Bao, Yi
AU - Hoehler, Matthew S.
AU - Smith, Christopher M.
AU - Bundy, Matthew
AU - Chen, Genda
N1 - Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2017/9/18
Y1 - 2017/9/18
N2 - In this study, Brillouin scattering-based distributed fiber optic sensor is implemented to measure temperature distributions and detect cracks in concrete structures subjected to fire for the first time. A telecommunication-grade optical fiber is characterized as a high temperature sensor with pulse pre-pump Brillouin optical time domain analysis (PPP-BODTA), and implemented to measure spatially-distributed temperatures in reinforced concrete beams in fire. Four beams were tested to failure in a natural gas fueled compartment fire, each instrumented with one fused silica, single-mode optical fiber as a distributed sensor and four thermocouples. Prior to concrete cracking, the distributed temperature was validated at locations of the thermocouples by a relative difference of less than 9%. The cracks in concrete can be identified as sharp peaks in the temperature distribution since the cracks are locally filled with hot air. Concrete cracking did not affect the sensitivity of the distributed sensor but concrete spalling broke the optical fiber loop required for PPP-BOTDA measurements.
AB - In this study, Brillouin scattering-based distributed fiber optic sensor is implemented to measure temperature distributions and detect cracks in concrete structures subjected to fire for the first time. A telecommunication-grade optical fiber is characterized as a high temperature sensor with pulse pre-pump Brillouin optical time domain analysis (PPP-BODTA), and implemented to measure spatially-distributed temperatures in reinforced concrete beams in fire. Four beams were tested to failure in a natural gas fueled compartment fire, each instrumented with one fused silica, single-mode optical fiber as a distributed sensor and four thermocouples. Prior to concrete cracking, the distributed temperature was validated at locations of the thermocouples by a relative difference of less than 9%. The cracks in concrete can be identified as sharp peaks in the temperature distribution since the cracks are locally filled with hot air. Concrete cracking did not affect the sensitivity of the distributed sensor but concrete spalling broke the optical fiber loop required for PPP-BOTDA measurements.
KW - PPP-BOTDA
KW - concrete crack detection
KW - distributed fiber optic sensor
KW - structural fire safety
KW - temperature distribution
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U2 - 10.1088/1361-665X/aa89a9
DO - 10.1088/1361-665X/aa89a9
M3 - Article
AN - SCOPUS:85030162370
SN - 0964-1726
VL - 26
JO - Smart Materials and Structures
JF - Smart Materials and Structures
IS - 10
M1 - 105034
ER -