Distributed Strain Monitoring in Tunnel Shotcrete (with and without yieldable concrete wedges) by fiber-based TW-COTDR technique

2016 ◽  
Author(s):  
I. Planes ◽  
S. Girard ◽  
A. Boukenter ◽  
E. Marin ◽  
S. Delepine-Lesoille ◽  
...  
Keyword(s):  
Strain Monitoring ◽  
Distributed Strain

Distributed strain monitoring of two-way slabs

2019 ◽  
Vol 189 ◽  
pp. 580-588
Author(s):  
Sara Nurmi ◽  
Neil A. Hoult ◽  
Simon D. Howell
Keyword(s):  
Strain Monitoring ◽  
Distributed Strain

Experimental Study of Temperature Correction on Single-Mode Sleeve Fiber for Distributed Strain Monitoring

2011 ◽  
Vol 340 ◽  
pp. 136-142
Author(s):  
You Long Gao ◽  
Guang Li Xu ◽  
Jun Yi Zhang ◽  
Qi Lang Le
Keyword(s):  
Experimental Study ◽  
Temperature Effect ◽  
Single Mode ◽  
Temperature Correction ◽  
Force Condition ◽  
Strain Monitoring ◽  
Additional Strain ◽  
Different Temperatures ◽  
Distributed Strain ◽  
Correction Equations

Because of the temperature effect of the distributed strain observation, it is not easy to analyze the real strain in tested data. Experiments of fibers under different temperatures and force conditions are carried out. The bare fiber, Φ 0.9 SM and Φ 2.0 SM single-mode sleeve fibers are chosen in the experiment scheme. It was found that the temperature effect of the distributed strain is independent with the force condition. The additional strain of fibers under the stress and different temperatures are discussed. For practices using, temperature correction equations on single-mode sleeve fiber are proposed to reduce the temperature effect.

scholarly journals Industrial Qualification Process for Optical Fibers Distributed Strain and Temperature Sensing in Nuclear Waste Repositories

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
S. Delepine-Lesoille ◽  
X. Phéron ◽  
J. Bertrand ◽  
G. Pilorget ◽  
G. Hermand ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Brillouin Scattering ◽  
Hydrogen Release ◽  
Nuclear Wastes ◽  
Strain Measurements ◽  
Strain Monitoring ◽  
Geological Repository ◽  
Radiation Hard ◽  
Waste Repositories ◽  
Distributed Strain

Temperature and strain monitoring will be implemented in the envisioned French geological repository for high- and intermediate-level long-lived nuclear wastes. Raman and Brillouin scatterings in optical fibers are efficient industrial methods to provide distributed temperature and strain measurements. Gamma radiation and hydrogen release from nuclear wastes can however affect the measurements. An industrial qualification process is successfully proposed and implemented. Induced measurement uncertainties and their physical origins are quantified. The optical fiber composition influence is assessed. Based on radiation-hard fibers and carbon-primary coatings, we showed that the proposed system can provide accurate temperature and strain measurements up to 0.5 MGy and 100% hydrogen concentration in the atmosphere, over 200 m distance range. The selected system was successfully implemented in the Andra underground laboratory, in one-to-one scale mockup of future cells, into concrete liners. We demonstrated the efficiency of simultaneous Raman and Brillouin scattering measurements to provide both strain and temperature distributed measurements. We showed that 1.3 μm working wavelength is in favor of hazardous environment monitoring.

Distributed strain monitoring for different composites structures with high resolution based on optical fiber sensing

Optik ◽  
2021 ◽  
pp. 168113
Author(s):  
Yage Zhan ◽  
Ziting Wang ◽  
Min Han ◽  
Long Xu ◽  
Zhongkang Song ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Fiber ◽  
Fiber Sensing ◽  
Strain Monitoring ◽  
Optical Fiber Sensing ◽  
Distributed Strain
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