Strain sensing in fiber optic coils with buried Bragg gratings

2000 ◽  
Author(s):  
Anup Sharma ◽  
L. Phillips ◽  
Sherrie J. Burgett ◽  
Paul B. Ruffin ◽  
W. Long
Keyword(s):  
Fiber Optic ◽  
Bragg Gratings ◽  
Strain Sensing

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.

scholarly journals The effect of fault architecture on slip behavior in shale revealed by distributed fiber optic strain sensing

2021 ◽  
Author(s):  
Chet Hopp ◽  
Yves Guglielmi ◽  
Antonio Pio Rinaldi ◽  
Florian Soom ◽  
Quinn Wenning ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Strain Sensing ◽  
Fault Architecture

scholarly journals Temperature and Strain Sensing With Femtosecond Laser Written Bragg Gratings in Defect and Nondefect Suspended-Silica-Core Fibers

2012 ◽  
Vol 24 (7) ◽  
pp. 554-556 ◽  
Author(s):  
Luís André Fernandes ◽  
Martin Becker ◽  
Orlando Frazao ◽  
Kay Schuster ◽  
Jens Kobelke ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Bragg Gratings ◽  
Strain Sensing ◽  
Silica Core

Common-mode noises self-suppressed 3-component fiber optic accelerometer based on low-reflectivity Bragg gratings

2021 ◽  
Author(s):  
Fei Liu ◽  
Duo Yi ◽  
yi chen ◽  
ping xu ◽  
Min Zhang ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Bragg Gratings ◽  
Common Mode
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