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Updated: May 26, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Published on: September 30, 2019

A magnetostrictive composite-fiber Bragg Grating sensor.

Sully M M Quintero1, Arthur M B Braga, Hans I Weber

  • 1Department of Mechanical Engineering, Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea 22453-900, Rio de Janeiro, Brazil. sully@aluno.puc-rio.br

Sensors (Basel, Switzerland)
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

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This study introduces a compact fiber optic sensor for magnetic field detection. Optimized with Terfenol-D composite, it achieves high resolution for both DC and AC magnetic field measurements.

Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Magnetic field sensing is crucial for various applications.
  • Existing sensors may lack compactness, sensitivity, or versatility for DC/AC fields.
  • Optical Fiber Bragg Grating (FBG) sensors offer potential for robust magnetic field measurement.

Purpose of the Study:

  • To develop and characterize a light and compact FBG sensor for DC and AC magnetic field measurements.
  • To investigate the optimal composition of a magnetostrictive coating for enhanced sensor performance.
  • To evaluate the impact of compressive preloading on sensor resolution.

Main Methods:

  • Coating an FBG with a magnetostrictive composite of Terfenol-D particles in an epoxy resin.
  • Testing various Terfenol-D volume fractions and particle sizes (212-300 μm).
Keywords:
fiber Bragg gratingmagnetic field sensormagnetostrictive composite

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  • Investigating the effect of compressive preload (up to 8.6 MPa) on sensor response.
  • Conducting static (up to 750 mT) and dynamic measurements using a magnetic rotor.

    • Main Results:

    • An epoxy resin binder with 30% volume fraction of Terfenol-D (212-300 μm) yielded the best magnetostrictive response.
    • Achieved a resolution of 0.4 mT without preload and 0.3 mT with an 8.6 MPa compressive pre-stress.
    • Sensor demonstrated capability for measuring magnetic fields up to 750 mT under static conditions.
    • Successful dynamic measurements were performed with an unbalanced rotor.

    Conclusions:

    • A novel, compact FBG sensor utilizing a Terfenol-D composite coating is effective for magnetic field sensing.
    • Optimized coating composition and compressive preloading significantly enhance sensor resolution.
    • The developed sensor shows promise for accurate DC and AC magnetic field measurements in dynamic environments.