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Related Concept Videos

Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's first...
Normal and Shear Force01:14

Normal and Shear Force

When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
Shearing Stress01:18

Shearing Stress

Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.

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Related Experiment Video

Updated: Jun 12, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Talbot interferometry with increased shear: part 3.

K Patorski

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

    Higher harmonic detection in Talbot interferometry boosts sensitivity. This study theoretically and experimentally verifies detecting symmetrical and nonsymmetrical diffraction orders from a square wave grating.

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    Area of Science:

    • Optics and Photonics
    • Interferometry

    Background:

    • Talbot interferometry is a widely used technique for optical measurements.
    • Increasing the sensitivity of interferometric methods is crucial for high-precision applications.

    Purpose of the Study:

    • To investigate methods for enhancing the sensitivity of Talbot interferometry.
    • To explore the detection of higher harmonics in the Fresnel diffraction field.

    Main Methods:

    • Theoretical analysis of diffraction orders from a square wave-type amplitude grating.
    • Experimental verification of the theoretical predictions.

    Main Results:

    • Demonstrated that detecting higher harmonics increases Talbot interferometry sensitivity.
    • Successfully detected both symmetrical and nonsymmetrical diffraction orders.
    • Validated theoretical models with experimental data.

    Conclusions:

    • Higher harmonic detection is an effective strategy to improve Talbot interferometry sensitivity.
    • The described method provides a pathway for more precise optical measurements.