Brillouin scattering based sensor in high gamma dose environment: design and optimization of optical fiber for long-term distributed measurement

2012 ◽  
Author(s):  
X. Phéron ◽  
J. Bertrand ◽  
S. Girard ◽  
Y. Ouerdane ◽  
S. Delepine-Lesoille ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Gamma Dose ◽  
Environment Design ◽  
Design And Optimization ◽  
High Gamma ◽  
Distributed Measurement

scholarly journals Distributed Fiberoptic Sensor for Simultaneous Temperature and Strain Monitoring Based on Brillouin Scattering Effect in Polyimide-Coated Fibers

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Liwen Sheng ◽  
Ligong Li ◽  
Leijun Hu ◽  
Ming Yuan ◽  
Jinpeng Lang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Optical Fiber Sensor ◽  
Frequency Shifts ◽  
Strain Monitoring ◽  
Excellent Candidate ◽  
Sensitivity Problem ◽  
Distributed Measurement ◽  
Two Peaks ◽  
Fiberoptic Sensor

A unique multiparameter sensor for distributed measurement of temperature and strain based on spontaneous Brillouin scattering in polyimide-coated optical fiber is proposed, which is an excellent candidate for the cross-sensitivity problem in conventional Brillouin sensing network. In the experimental section, the discrimination of strain and temperature is successfully demonstrated by analysing the unequal sensing coefficients of the Brillouin frequency shifts generated by different acoustic modes. The Brillouin frequency shifts of the main two peaks are successfully measured to discriminate the strain and temperature with an accuracy 19.68 με and 1.02°C in 2.5 km sensing range. The proposed distributed Brillouin optical fiber sensor allows simultaneous measurement of temperature and strain, thus opening a door for practical application such as oil explorations.

scholarly journals High-Performance Distributed Brillouin Optical Fiber Sensing

2021 ◽  
Vol 11 (1) ◽  
pp. 69-90
Author(s):  
Yongkang Dong
Keyword(s):  
Optical Fiber ◽  
High Performance ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Dynamic Grating ◽  
Distributed Measurement ◽  
The Time Domain ◽  
Stimulated Brillouin

AbstractThis paper reviews the recent advances on the high-performance distributed Brillouin optical fiber sensing, which include the conventional distributed Brillouin optical fiber sensing based on backward stimulated Brillouin scattering and two other novel distributed sensing mechanisms based on Brillouin dynamic grating and forward stimulated Brillouin scattering, respectively. As for the conventional distributed Brillouin optical fiber sensing, the spatial resolution has been improved from meter to centimeter in the time-domain scheme and to millimeter in the correlation-domain scheme, respectively; the measurement time has been reduced from minute to millisecond and even to microsecond; the sensing range has reached more than 100 km. Brillouin dynamic grating can be used to measure the birefringence of a polarization-maintaining fiber, which has been explored to realize distributed measurement of temperature, strain, salinity, static pressure, and transverse pressure. More recently, forward stimulated Brillouin scattering has gained considerable interest because of its capacity to detect mechanical features of materials surrounding the optical fiber, and remarkable works using ingenious schemes have managed to realize distributed measurement, which opens a brand-new way to achieve position-resolved substance identification.

A Multiplexed Optical Fiber Sensor System For Distributed Measurement Of Structural Strains

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari ◽  
Z. Chen ◽  
Q. Li
Keyword(s):  
Optical Fiber ◽  
Optical Switch ◽  
Optical Fiber Sensor ◽  
Fiber Material ◽  
Smart Structure ◽  
Sensor System ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Large Structures ◽  
Distributed Measurement

ABSTRACTStructurally integrated optical fiber sensors form the basis for smart structure technology. Over the past decade a variety of sensor configurations have been developed for measurement of strains and deformations in structures. Strains and deformations alter the refractive index and the geometry of the optical fiber material. These changes perturb the intensity, phase, and polarization of the light-wave propagating along the probing fiber. The optical perturbations are detected for the determination of strain. The research presented here describes the development of a new optical fiber sensor system for measurement of structural strains based on white light interferometry. An optical switch provides for multiplexing of strain signals from various locations in the structure. Redundant Bragg grating type fiber optic sensors as well as strain gauges were employed for comparison and verification of strain signals as measured by the new system. The system provides capability for distributed sensing of strains in large structures.

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