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Related Experiment Video

Updated: May 6, 2026

Writing Bragg Gratings in Multicore Fibers
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A tailless FBG smart bolt with good performance.

Dan Hou1, Min Zheng1, Zhimin Yang1

  • 1Guangdong Provincial Optical Fiber Sensing Engineering Technology Research and Development Center, T&S Communications Co., Ltd., Shenzhen, 518118, China.

Heliyon
|September 23, 2024
PubMed
Summary
This summary is machine-generated.

A new tailless Fiber Bragg Grating (FBG) smart bolt accurately monitors torque and looseness. Its integrated sensor design shows a strong linear correlation between applied torque and wavelength, validated by experiments.

Keywords:
Bolt looseness monitoringIntegrated FBG sensorTailless FBG smart bolt

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Area of Science:

  • Mechanical Engineering
  • Sensor Technology
  • Materials Science

Background:

  • Traditional bolts lack integrated real-time monitoring capabilities.
  • Existing monitoring methods can be complex or intrusive.
  • Need for robust, integrated sensors in structural health monitoring.

Purpose of the Study:

  • To develop and validate a novel tailless Fiber Bragg Grating (FBG) smart bolt.
  • To enable accurate torque and bolt looseness monitoring.
  • To establish a theoretical and experimental correlation between applied torque and FBG wavelength.

Main Methods:

  • Design and fabrication of a novel tailless FBG smart bolt incorporating strain and temperature-compensated FBGs.
  • Theoretical modeling to establish the linear relationship between torque and central wavelength.
  • Experimental testing of the smart bolt under applied torque.

Main Results:

  • Successful development and fabrication of the tailless FBG smart bolt.
  • Experimental validation of a strong linear correlation between applied torque and the central wavelength.
  • Demonstrated good agreement between theoretical predictions and experimental results.

Conclusions:

  • The developed tailless FBG smart bolt offers a high-performance solution for torque and looseness monitoring.
  • The integrated FBG sensor design is effective for structural health monitoring applications.
  • The study confirms the feasibility and accuracy of using FBG technology in smart bolts.