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Related Concept Videos

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...
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A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...

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Multiple-beam wedge-plate shear interferometer for collimation testing.

P Senthilkumaran, K V Sriram, M P Kothiyal

    Applied Optics
    |November 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A modified wedge-plate shear interferometer uses a reflective coating to create sharp interference fringes for precise collimation testing. Fringe splitting indicates non-collimated beams, serving as a reliable test criterion.

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    Area of Science:

    • Optical metrology
    • Interferometry

    Background:

    • Collimation testing is crucial for optical system performance.
    • Traditional wedge-plate interferometers may lack sensitivity for certain tests.

    Purpose of the Study:

    • To present a modified wedge-plate shear interferometer for enhanced collimation testing.
    • To introduce a novel criterion for assessing beam collimation using fringe splitting.

    Main Methods:

    • Coating the wedge plate surface to increase reflectivity.
    • Utilizing multiple-beam interference to generate sharp interference fringes.
    • Observing fringe splitting as an indicator of non-collimated test beams.

    Main Results:

    • Achieved significantly sharper interference fringes compared to standard methods.
    • Demonstrated that fringe splitting directly correlates with beam non-collimation.
    • Experimental validation confirmed the effectiveness of the modified interferometer.

    Conclusions:

    • The modified wedge-plate shear interferometer offers a sensitive and effective method for collimation testing.
    • The observed fringe splitting provides a clear and reliable criterion for assessing beam collimation.
    • This technique enhances the precision of optical alignment and quality control.