Distributed fiber optic strain sensing by synthesizing dynamic grating in polarization-maintaining erbium-doped fiber

2004 ◽  
Author(s):  
Xinyu Fan ◽  
Zuyuan He ◽  
Kazuo Hotate
Keyword(s):  
Fiber Optic ◽  
Strain Sensing ◽  
Erbium Doped ◽  
Polarization Maintaining ◽  
Dynamic Grating

Temperature and Strain Sensing Mechanism in Polarization Maintaining Fiber Based on Brillouin Dynamic Grating

2019 ◽  
Vol 48 (8) ◽  
pp. 806001 ◽  
Author(s):  
徐志钮 XU Zhi-niu ◽  
赵丽娟 ZHAO Li-juan ◽  
陈飞飞 CHEN Fei-fei ◽  
车小霞 CHE Xiao-xia ◽  
郭文翰 GUO Wen-han ◽  
...  
Keyword(s):  
Strain Sensing ◽  
Sensing Mechanism ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Dynamic Grating

scholarly journals Microanchored borehole fiber optics allows strain profiling of the shallow subsurface

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cheng-Cheng Zhang ◽  
Bin Shi ◽  
Song Zhang ◽  
Kai Gu ◽  
Su-Ping Liu ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Field Experiments ◽  
Fiber Optic ◽  
Strain Sensing ◽  
Near Surface ◽  
Shallow Subsurface ◽  
Buried Cables ◽  
Capacity Theory ◽  
Confining Pressures ◽  
Strain Determination

AbstractVertical deformation profiles of subterranean geological formations are conventionally measured by borehole extensometry. Distributed strain sensing (DSS) paired with fiber-optic cables installed in the ground opens up possibilities for acquiring high-resolution static and quasistatic strain profiles of deforming strata, but it is currently limited by reduced data quality due to complicated patterns of interaction between the buried cables and their surroundings, especially in upper soil layers under low confining pressures. Extending recent DSS studies, we present an improved approach using microanchored fiber-optic cables—designed to optimize ground-to-cable coupling at the near surface—for strain determination along entire lengths of vertical boreholes. We proposed a novel criterion for soil–cable coupling evaluation based on the geotechnical bearing capacity theory. We applied this enhanced methodology to monitor groundwater-related vertical motions in both laboratory and field experiments. Corroborating extensometer recordings, acquired simultaneously, validated fiber optically determined displacements, suggesting microanchored DSS as an improved means for detecting and monitoring shallow subsurface strain profiles.

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