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Related Concept Videos

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Deflection of a Beam01:19

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Magnetic Tweezers for the Measurement of Twist and Torque
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Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

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Multiple-twisted spiral beams.

Evgeniya Razueva, Eugeny Abramochkin

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |June 4, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We present a new method to create spiral light beams with rotating intensity patterns. This technique allows for controlled rotation angles and diverse beam shapes, advancing optical beam generation.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Electromagnetism

    Background:

    • Spiral light beams exhibit unique intensity profiles that rotate during propagation.
    • Controlling the rotation rate and total angle of these beams is crucial for applications in optical manipulation and information transfer.

    Purpose of the Study:

    • To develop a method for constructing paraxial light fields with specific rotational properties.
    • To enable the generation of multiple-twisted spiral beams with controllable intensity shapes and rotation rates.

    Main Methods:

    • Derivation of analytical expressions for the complex amplitude of spiral beams.
    • Utilizing an integral description of Laguerre-Gaussian beams for beam construction.

    Main Results:

    • Successful construction of paraxial light fields with whole transverse intensity rotation (spiral beams).
    • Generation of multiple-twisted beams with total rotation angles as integer multiples of π/2.
    • Demonstration of a straightforward method to achieve various intensity shapes and rotation rates.

    Conclusions:

    • The proposed method offers a versatile and direct approach to generating multiple-twisted spiral beams.
    • This technique facilitates the creation of tailored light fields for advanced optical applications.