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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Pasted type distributed two-dimensional fiber Bragg grating vibration sensor.

Tianliang Li1, Yuegang Tan1, Zude Zhou1

  • 1School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, Hubei, China.

The Review of Scientific Instruments
|August 3, 2015
PubMed
Summary
This summary is machine-generated.

A novel two-dimensional fiber Bragg grating (FBG) vibration sensor is presented. This sensor effectively measures vibrations in two dimensions by analyzing wavelength shifts, offering high sensitivity and linearity for distributed sensing applications.

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Area of Science:

  • Optical Engineering
  • Sensor Technology
  • Materials Science

Background:

  • Traditional vibration sensors often lack multi-dimensional capabilities.
  • Fiber Bragg Gratings (FBGs) offer a robust platform for sensing applications.
  • Accurate two-dimensional vibration measurement is crucial in various engineering fields.

Purpose of the Study:

  • To propose and investigate a novel pasted type distributed two-dimensional fiber Bragg grating (FBG) vibration sensor.
  • To demonstrate the principle, numerical simulation, and experimental validation of the proposed sensor.
  • To evaluate the sensor's performance characteristics, including resonant frequencies, frequency range, dynamic range, sensitivity, and linearity.

Main Methods:

  • Development of a pasted type two-dimensional FBG vibration sensor.
  • Utilizing the optical fiber as an elastomer for vibration detection.
  • Separating two-dimensional vibration components through the subtraction/addition of two FBGs' center wavelength shifts.
  • Conducting numerical simulations and experimental analyses to validate the sensor's performance.

Main Results:

  • Experimental resonant frequencies for x/y vibration directions are 1300 Hz and 20.51 Hz, consistent with simulations.
  • Flat frequency ranges are 10-750 Hz (x-direction) and 3-12 Hz (y-direction).
  • High sensitivity achieved: 32.84 pm/g (x-direction) and 451.3 pm/g (y-direction) with good linearity.
  • Low cross-sensitivity of 3.91% demonstrated.

Conclusions:

  • The proposed two-dimensional FBG vibration sensor effectively measures vibrations in two dimensions.
  • The sensor exhibits excellent performance metrics, including sensitivity, linearity, and a wide dynamic range.
  • This technology is suitable for distributed two-dimensional vibration measurement applications.