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Related Concept Videos

Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.

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Related Experiment Video

Updated: Jun 6, 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

Fiber-optic Faraday-effect magnetic-field sensor based on flux concentrators.

M N Deeter

    Applied Optics
    |November 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study details a fiber-optic magnetic-field sensor using yttrium-iron-garnet (YIG). It achieves high sensitivity and a wide bandwidth for precise magnetic field measurements.

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    Last Updated: Jun 6, 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

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
    09:03

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

    Published on: January 7, 2019

    Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
    07:01

    Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

    Published on: June 9, 2016

    Area of Science:

    • Optoelectronics
    • Magnetometry
    • Materials Science

    Background:

    • Fiber-optic sensors offer remote and non-intrusive measurement capabilities.
    • Accurate magnetic field sensing is crucial in various scientific and industrial applications.
    • Yttrium-iron-garnet (YIG) exhibits favorable magneto-optic properties for sensing.

    Purpose of the Study:

    • To describe the design and performance of a novel fiber-optic Faraday-effect magnetic-field sensor.
    • To optimize sensitivity using flux concentrators and a YIG sensing element.
    • To evaluate the sensor's noise equivalent field and bandwidth.

    Main Methods:

    • Utilized a fiber-optic Faraday-effect sensor configuration.
    • Employed polarization-rotated reflection with a single polarization-maintaining optical fiber.
    • Integrated ferrite flux concentrators magnetically coupled to a YIG sensing element.
    • Characterized sensor performance, including noise equivalent field and bandwidth.

    Main Results:

    • The sensor design successfully integrated a YIG element with ferrite flux concentrators.
    • The system demonstrated a noise equivalent field of 6 pT/√Hz.
    • A 3-dB bandwidth of approximately 10 MHz was achieved.

    Conclusions:

    • The developed fiber-optic sensor provides sensitive and broadband magnetic field detection.
    • The design leveraging YIG and flux concentrators is effective for enhancing sensor performance.
    • This sensor technology holds promise for advanced magnetometry applications.