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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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Related Experiment Video

Updated: Jun 12, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Universal digital speckle shearing interferometer.

A R Ganesan, D K Sharma, M P Kothiyal

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

    This study introduces a novel speckle shear interferometer capable of real-time fringe generation for various shear types. Advanced digital image processing techniques achieve unit contrast fringes, enhancing interferometric analysis.

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    Area of Science:

    • Optics and Photonics
    • Digital Image Processing
    • Experimental Mechanics

    Background:

    • Speckle interferometry is a powerful tool for non-contact surface measurement.
    • Shear interferometry provides derivatives of the wavefront, useful for stress analysis.
    • Real-time processing is crucial for dynamic applications.

    Purpose of the Study:

    • To present a versatile speckle shear interferometer.
    • To demonstrate real-time generation of multiple shear fringe types.
    • To validate the system's performance using experimental mechanics.

    Main Methods:

    • Development of a speckle shear interferometer with adaptable optical configurations.
    • Integration with a digital image processing system for real-time analysis.
    • Application of nonlinear processing techniques, specifically level slicing, for fringe enhancement.

    Main Results:

    • The interferometer successfully generated lateral, radial, rotational, inversion, and folding shear fringes in real time.
    • Unit contrast fringes were achieved through nonlinear processing.
    • Experimental validation was performed on an edge-clamped diaphragm under concentrated load.

    Conclusions:

    • The developed speckle shear interferometer offers a flexible and effective method for optical metrology.
    • Real-time fringe generation and enhancement capabilities open new avenues for stress and deformation analysis.
    • The system's performance is suitable for investigating complex mechanical behaviors.