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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...

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Simple electronic speckle-shearing-pattern interferometer.

C Joenathan, R Torroba

    Optics Letters
    |September 23, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel electronic speckle-shearing-pattern interferometer uses a split lens and diffuser to create sheared images. This method allows for digital processing and analysis of lateral and radial shearing patterns for optical measurements.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Digital Image Processing

    Background:

    • Speckle interferometry is a technique used for non-contact measurement of surface displacement and strain.
    • Traditional speckle interferometers can be complex and require specialized optical components.
    • There is a need for simpler and more cost-effective interferometric systems.

    Purpose of the Study:

    • To describe a simple electronic speckle-shearing-pattern interferometer (ESPI).
    • To demonstrate the capability of the interferometer for analyzing lateral and radial shearing patterns.
    • To present the results obtained from the developed ESPI system.

    Main Methods:

    • Utilized a split lens to focus and shear an object's image onto a diffuser.
    • Employed a television camera to capture the sheared speckle patterns from the diffuser.
    • Digitized and processed the captured images using a host computer for analysis.

    Main Results:

    • Successfully generated and captured sheared speckle patterns.
    • Presented results for both lateral and radial shearing configurations.
    • Demonstrated the feasibility of digital processing for ESPI analysis.

    Conclusions:

    • The described ESPI system offers a simple and effective method for optical measurements.
    • The system is capable of analyzing different types of shearing patterns.
    • Digital processing enhances the practicality and accessibility of speckle interferometry.