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Magnetic Field Sensing Based on Bi-Tapered Optical Fibers Using Spectral Phase Analysis.

Luis A Herrera-Piad1, Joseph W Haus2, Daniel Jauregui-Vazquez3

  • 1Departamento de Ingeniería Electrónica, División de Ingenierías, Universidad de Guanajuato, Carretera, Salamanca-Valle de Santiago km 3.5 + 1.8, Comunidad de Palo Blanco, Salamanca Gto. C.P. 36885, Mexico. la.herrerapiad@ugto.mx.

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Summary
This summary is machine-generated.

A novel magnetic field sensor uses a bi-tapered optical fiber (BTOF) on magnetic tape. This compact system offers remote sensing with a linear response and low-cost materials, achieving a phase sensitivity of 0.28 rad/mT.

Keywords:
magnetic fiber optic sensoroptical signal processingtapered optical fibers

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Area of Science:

  • Photonics
  • Optoelectronics
  • Materials Science

Background:

  • Optical fiber sensors offer advantages in sensitivity and remote operation.
  • Magnetic field sensing is crucial for various industrial and scientific applications.
  • Bi-tapered optical fibers (BTOFs) provide unique modal interference characteristics.

Purpose of the Study:

  • To design, fabricate, and characterize a compact magnetic field sensor system.
  • To investigate the performance of a BTOF-based sensor for magnetic field detection.
  • To evaluate the sensor's sensitivity, linearity, and remote sensing capabilities.

Main Methods:

  • A compact sensor system was designed using a short bi-tapered optical fiber (BTOF) span on a magnetic tape.
  • Transmission spectra from a broadband light source were monitored.
  • Phase analysis of the interference optical spectrum was applied to characterize the sensor response.
  • The interference signal was analyzed based on the interaction between a high-order modal component and the core fiber mode.

Main Results:

  • Two fabricated BTOFs with distinct interference spectrum characteristics were analyzed.
  • The sensor demonstrated a linear response to magnetic field increments.
  • A phase sensitivity of approximately 0.28 rad/mT was achieved.
  • The system demonstrated remote sensing operation.

Conclusions:

  • The developed BTOF-based sensor system is a compact and effective solution for magnetic field detection.
  • The sensor exhibits a linear response and good sensitivity, suitable for practical applications.
  • The use of low-cost transducer magnetic material and remote sensing capability enhances its applicability.