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Writing Bragg Gratings in Multicore Fibers
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A Fiber Bragg Grating Based Torsional Vibration Sensor for Rotating Machinery.

Jingjing Wang1, Li Wei2, Ruiya Li3

  • 1School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China. jingjingwangwhut@163.com.

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Summary

This study introduces a novel fiber Bragg grating (FBG) torsional vibration sensor. Its unique design offers small size, lightweight properties, and resistance to interference, enabling precise torsional vibration measurement.

Keywords:
fiber Bragg gratingrotating machinerytorsional vibration

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Area of Science:

  • Optical Engineering
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Torsional vibrations are critical parameters in many mechanical systems.
  • Existing sensors often face limitations in size, weight, and environmental interference.
  • Fiber Bragg Gratings (FBGs) offer a robust platform for sensing applications.

Purpose of the Study:

  • To propose and validate a new fiber Bragg grating (FBG) based sensor for torsional vibration measurement.
  • To design a compact, lightweight, and interference-resistant torsional vibration sensor.
  • To analyze the sensor's performance characteristics, including natural frequency and sensitivity.

Main Methods:

  • Development of a novel sensor architecture utilizing two mass ball optical fiber systems.
  • Employing optical fibers as elastomers with mass balls fixed at the center.
  • Utilizing wavelength shifts from four FBGs to calculate torsional vibration signals.
  • Implementing differential measurement between two systems to mitigate horizontal vibration and temperature interference.
  • Conducting numerical analysis and structural parameter design.

Main Results:

  • The proposed sensor is small, lightweight, and exhibits anti-electromagnetic interference properties.
  • The sensor successfully calculates torsional vibration signals based on FBG wavelength shifts.
  • Differential design effectively cancels out horizontal vibration and temperature effects.
  • Experimental validation confirmed a minimum torsional natural frequency of 27.35 Hz.
  • Achieved a torsional vibration measurement sensitivity of 0.3603 pm/(rad/s²).

Conclusions:

  • The developed FBG-based sensor is a viable solution for accurate torsional vibration monitoring.
  • The sensor's design offers significant advantages in terms of size, weight, and environmental robustness.
  • The achieved sensitivity and frequency response are suitable for various industrial applications.