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Related Experiment Video

Updated: May 8, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Magnetic field sensor using tilted fiber grating interacting with magnetic fluid.

Jie Zheng1, Xinyong Dong, Peng Zu

  • 1Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China.

Optics Express
|August 14, 2013
PubMed
Summary

A new magnetic field sensor uses a tilted fiber Bragg grating (TFBG) and magnetic fluid to measure magnetic fields up to 196 Gauss. This sensor can also simultaneously detect temperature variations.

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Area of Science:

  • Optoelectronics
  • Magnetometry
  • Fiber optic sensing

Background:

  • Magnetic field sensors are crucial for various applications.
  • Existing sensors face limitations in sensitivity, size, or simultaneous measurement capabilities.
  • Optical fiber sensors offer advantages like immunity to electromagnetic interference.

Purpose of the Study:

  • To propose and demonstrate a novel magnetic field sensor.
  • To utilize the interaction between a tilted fiber Bragg grating (TFBG) and magnetic fluid.
  • To achieve sensitive magnetic field measurement and simultaneous temperature sensing.

Main Methods:

  • A TFBG was fabricated and immersed in magnetic fluid.
  • The complex refractive index of the magnetic fluid was modulated by an external magnetic field.

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Last Updated: May 8, 2026

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  • Cladding mode resonance extinction ratios and wavelength shifts were monitored.
  • Magnetic field strength and temperature were measured by analyzing spectral changes.

    • Main Results:

    • The sensor successfully measured magnetic field strength up to 196 Gauss.
    • The extinction ratio of cladding mode resonance correlated with magnetic field strength.
    • Simultaneous temperature measurement was achieved by analyzing the TFBG transmission spectrum wavelength shift.
    • The proposed sensor demonstrated good performance and potential for practical applications.

    Conclusions:

    • A novel magnetic field sensor based on TFBG and magnetic fluid was successfully demonstrated.
    • The sensor enables sensitive magnetic field measurement and simultaneous temperature sensing.
    • This technology holds promise for advanced sensing applications requiring dual-parameter detection.