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Related Concept Videos

Position and Displacement Vectors01:00

Position and Displacement Vectors

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To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
Further, several important kinds of...
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Eccentricity of an Ellipse01:27

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An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
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Eccentric Loading01:16

Eccentric Loading

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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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General Case of Eccentric Axial Loading01:12

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
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Displacement Current01:19

Displacement Current

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Position and Displacement01:31

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
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All-fiber 3D vector displacement (bending) sensor based on an eccentric FBG.

Weijia Bao, Qiangzhou Rong, Fengyi Chen

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    This study presents a novel fiber-optic sensor for measuring 3D vector displacement. The sensor utilizes eccentric fiber Bragg gratings to detect bending direction and magnitude for precise spatial tracking.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Nanotechnology

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for sensing applications.
    • Measuring 3D vector displacement typically requires complex sensor arrays.
    • Existing methods often lack compactness and directional sensitivity.

    Purpose of the Study:

    • To develop a compact and highly sensitive fiber-optic sensor for 3D vector displacement measurement.
    • To leverage the unique properties of eccentrically inscribed FBGs for enhanced directional sensing.
    • To integrate bending and strain monitoring for comprehensive spatial analysis.

    Main Methods:

    • Fabrication of eccentric fiber Bragg gratings in depressed cladding fiber (DCF) using femtosecond laser side-illumination and phase-mask technique.
    • Monitoring Bragg reflection characteristics to determine bending orientation and magnitude.
    • Integration with axial strain monitoring for complete 3D vector displacement calculation.

    Main Results:

    • Demonstrated a compact sensing probe with eccentrically positioned FBGs in DCF.
    • Showcased the bending orientation-dependence of the fundamental resonance.
    • Achieved accurate 3D vector displacement measurement through geometric analysis of bending and strain data.

    Conclusions:

    • The developed fiber-optic sensor effectively measures 3D vector displacement.
    • Eccentric gratings provide inherent directional sensitivity crucial for vector measurements.
    • This technology offers a promising solution for compact and precise spatial sensing applications.