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Related Concept Videos

Gyroscope: Precession01:24

Gyroscope: Precession

Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Related Experiment Video

Updated: Jun 20, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Open-loop fiber-optic gyroscope using intensity-modulated source and phase modulation.

M Oh, Y Kim, M Chung

    Optics Letters
    |September 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a simple open-loop fiber-optic gyroscope using an intensity-modulated light source. It achieves direct readout of the Sagnac effect with good linearity across a wide dynamic range.

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    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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    Published on: March 20, 2017

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    Last Updated: Jun 20, 2026

    Quasi-light Storage for Optical Data Packets
    07:45

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    Published on: February 6, 2014

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    Area of Science:

    • Photonics
    • Optical Engineering
    • Inertial Sensing

    Background:

    • Fiber-optic gyroscopes (FOGs) are crucial for inertial navigation.
    • Traditional FOGs often require closed-loop control for high performance.
    • Open-loop configurations can simplify designs but may compromise accuracy.

    Purpose of the Study:

    • To develop a simplified open-loop fiber-optic gyroscope.
    • To achieve direct readout of the Sagnac effect without complex feedback.
    • To demonstrate linearity and wide dynamic range in the proposed system.

    Main Methods:

    • Utilized a standard fiber-optic gyroscope architecture.
    • Employed an intensity-modulated light source.
    • Applied sinusoidal modulation to the source and phase modulator at a specific frequency.
    • Optimized source modulation depth for signal detection.

    Main Results:

    • Successfully demonstrated direct readout of the Sagnac effect in an open-loop configuration.
    • Achieved good linearity in measurements.
    • Verified performance over a wide dynamic range.

    Conclusions:

    • The proposed open-loop approach offers a simple and effective method for fiber-optic gyroscopes.
    • Direct readout of the Sagnac effect is feasible with intensity modulation.
    • The system shows promise for applications requiring robust and linear inertial sensing.