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Updated: May 28, 2025

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Acoustic Sensing Fiber Coupled with Highly Magnetostrictive Ribbon for Small-Scale Magnetic-Field Detection.

Zach Dejneka1, Daniel Homa1,2, Logan Theis2

  • 1Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA.

Sensors (Basel, Switzerland)
|February 13, 2025
PubMed
Summary
This summary is machine-generated.

This study demonstrates a novel fiber-optic sensing method for magnetic field detection. Using magnetostrictive materials and Fiber Bragg Grating (FBG) sensors, researchers achieved nanotesla-level sensitivity for distributed magnetic characterization.

Keywords:
distributed acoustic sensorsmagnetic-field sensorsmagnetismmagnetostrictionoptic sensors

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Fiber-optic sensing offers potential for magnetic field detection in downhole and biomedical applications.
  • Integrating magnetostrictive materials with fiber-based strain sensors enables novel magnetic characterization methods.
  • Existing methods may lack the distributed and high-sensitivity capabilities required for certain applications.

Purpose of the Study:

  • To investigate the strain response of magnetostrictive alloys (Metglas® 2605SC and Vitrovac® 7600 T70) when subjected to an AC magnetic field.
  • To evaluate the performance of Fiber Bragg Grating (FBG) acoustic sensors for detecting magnetic fields through magnetostrictive strain.
  • To demonstrate a new distributed fiber-optic sensing approach for high-sensitivity magnetic field measurements.

Main Methods:

  • Utilized highly magnetostrictive alloys (Metglas® 2605SC and Vitrovac® 7600 T70) as sensing elements.
  • Employed Fiber Bragg Grating (FBG) acoustic sensors to detect strain induced by the magnetic field.
  • Interrogated distributed FBG sensors using Sentek Instrument's picoDAS system to analyze the strain response transferred to the fiber.

Main Results:

  • Achieved a minimal detectable magnetic field amplitude of 60 nT using the Vitrovac® ribbon.
  • Demonstrated superior sensitivity with Metglas®, measuring field amplitudes as low as 3 nT.
  • Confirmed that FBG sensors require no bonding to the magnetostrictive material for effective field detection.

Conclusions:

  • The developed fiber-optic sensing configuration offers nanotesla-level sensitivity for magnetic characterization.
  • Distributed FBG sensors are commercially available, easily integrated, and provide a simple yet effective solution.
  • This approach shows significant potential for distributed magnetic measurements in various applications.