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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Related Experiment Video

Updated: Jun 20, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

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Published on: November 21, 2019

Magneto-optic current sensor using a helical-fiber Fabry-Perot resonator.

F Maystre, A Bertholds

    Optics Letters
    |September 16, 2009
    PubMed
    Summary

    A novel helical fiber-optic Fabry-Perot resonator enhances magneto-optic current sensor sensitivity. This compact design offers four times greater sensitivity than single-pass sensors due to resonator finesse.

    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Sensor Technology

    Background:

    • Magneto-optic sensors are crucial for non-invasive current measurement.
    • Traditional sensors face limitations in sensitivity and compactness.
    • Fabry-Perot resonators offer potential for enhanced optical sensing.

    Purpose of the Study:

    • To introduce a compact magneto-optic current sensor utilizing a helical fiber-optic Fabry-Perot resonator.
    • To investigate the impact of helical geometry on sensor performance.
    • To quantify the sensitivity enhancement achieved by the resonator's finesse.

    Main Methods:

    • Designing a single-turn helical fiber-optic Fabry-Perot resonator.
    • Integrating the resonator into a magneto-optic current sensor configuration.

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  • Conducting experimental measurements to compare sensitivity with single-pass sensors.

    • Main Results:

    • The helical shape enables a compact sensor with necessary polarization properties.
    • Resonator finesse significantly increases sensor sensitivity.
    • Experimental validation shows a fourfold sensitivity increase for a finesse of F=6 compared to single-pass sensors.

    Conclusions:

    • The helical fiber-optic Fabry-Perot resonator is a promising approach for high-sensitivity, compact current sensing.
    • The resonator's finesse is a key factor in achieving enhanced magneto-optic sensing performance.
    • This technology offers a significant improvement over existing single-pass sensor designs.