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Galvanometer

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...

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

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Highly sensitive optic fiber vector magnetometer based on the Fabry-Perot interferometer and harmonic Vernier effect.

Tianqi Yan, Chao Jiang, Ling Gao

|January 29, 2025

Summary

This study presents a novel fiber optic sensor for accurately measuring magnetic field (MF) intensity and direction. The sensor utilizes two parallel Fabry-Perot interferometers (FPIs) to achieve high sensitivity and ease of manufacturing.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Area of Science:

Optoelectronics
Fiber optic sensing
Magnetometry

Background:

Accurate measurement of vector magnetic fields is crucial for various scientific and industrial applications.
Existing magnetic field sensors often face limitations in sensitivity, size, or cost.
Fiber optic sensors offer advantages such as immunity to electromagnetic interference and remote sensing capabilities.

Purpose of the Study:

To develop and experimentally validate a high-sensitivity vector magnetic field sensor.
To leverage the harmonic Vernier effect for enhanced magnetic field sensing.
To demonstrate a cost-effective and robust fiber optic sensor design.

Main Methods:

Fabrication of a cantilever beam structure using two standard single-mode fibers within a capillary tube to form Fabry-Perot interferometer 1 (FPI₁).
Integration of FPI₁ with the magnetostrictive material Terfenol-D to enable response to magnetic fields.
Construction of a harmonic Vernier effect sensor (S₁) by combining FPI₁ with a reference interferometer (FPI₂).

Main Results:

FPI₁ demonstrated a high axial strain sensitivity of 15.0 pm/µε.
The Terfenol-D coated FPI₁ achieved magnetic field intensity sensitivity of 91.43 pm/mT and direction sensitivity of -12.75 pm/°.
The harmonic Vernier effect sensor S₁ exhibited amplified sensitivities: -4.308 nm/mT for intensity and 892.3 pm/° for direction, representing 47x and 33.0x improvements, respectively.
The sensor S₁ achieved high sensitivity in measuring both magnetic field intensity and direction.

Conclusions:

The proposed fiber optic sensor effectively measures vector magnetic fields with high sensitivity.
The sensor's design is easy to manufacture, reproducible, cost-effective, robust, and simple to operate, making it suitable for practical applications.
This sensor represents a promising alternative for vector magnetic field sensing in various fields.