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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.3K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Protection and Installation of FBG Strain Sensor in Deep Boreholes for Subsurface Faults Behavior Monitoring.

Sang-Jin Choi1, Kwon Gyu Park1, Chan Park2

  • 1Petroleum & Marine Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon 34132, Korea.

Sensors (Basel, Switzerland)
|August 10, 2021
PubMed
Summary

Fiber optic sensors, specifically fiber Bragg grating (FBG) strain sensors, were protected using fiber-reinforced plastic (FRP) forming for deep borehole installations. This protective method ensured sensor functionality and durability in challenging geotechnical applications.

Keywords:
FBG strain sensorborehole installation and completionfault behavior monitoringfiber reinforced plastic (FRP) formingsensor protection measures

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Area of Science:

  • Geotechnical Engineering
  • Sensor Technology
  • Materials Science

Background:

  • Fiber optic sensors, such as fiber Bragg grating (FBG) sensors, offer advantages over electrical sensors in geotechnical applications due to their immunity to electrical interference, durability, and cost-effectiveness.
  • However, protecting these sensors, cables, and splices is crucial for maintaining functionality during installation and operation in demanding borehole environments.
  • Deep subsurface fault monitoring requires robust sensor systems capable of withstanding harsh conditions.

Purpose of the Study:

  • To introduce and evaluate novel fiber-reinforced plastic (FRP) forming schemes for protecting fiber Bragg grating (FBG) strain sensors and their splices during deep borehole installations.
  • To assess the effectiveness of the proposed protective measures through uniaxial load testing and post-completion monitoring.
  • To demonstrate the successful application of protected FBG sensors for monitoring deep subsurface fault behavior.

Main Methods:

  • Installation of FBG strain sensors within 1 km deep boreholes.
  • Development and implementation of fiber-reinforced plastic (FRP) forming techniques to encapsulate sensors and splices.
  • Conducting uniaxial load tests on protected sensor components.
  • Performing post-installation monitoring of sensor performance in the borehole environment.

Main Results:

  • Uniaxial load tests confirmed that the FRP forming effectively protected the FBG sensors and splices.
  • Post-completion monitoring indicated successful installation and sustained functionality of the protected FBG sensors in deep boreholes.
  • The protective measures did not significantly impact the intrinsic performance of the FBG sensors.

Conclusions:

  • Fiber-reinforced plastic (FRP) forming provides a viable and effective protective solution for fiber Bragg grating (FBG) strain sensors in deep borehole geotechnical applications.
  • The implemented protective schemes ensure sensor integrity and reliable data acquisition for monitoring subsurface fault behavior.
  • Further considerations are suggested to enhance the broader applicability of FBG sensors in challenging borehole environments.