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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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Reflection plate interferometer.

C J Wick, S Winnikow

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The reflection plate interferometer, a Schlieren system alternative, offers high-quality interferograms for fluid density gradient analysis. Optimal performance is achieved with specific incident angles and adjustable fringe direction.

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    Area of Science:

    • Optical Physics
    • Fluid Dynamics

    Background:

    • Schlieren systems are common for visualizing fluid density variations.
    • Interferometric techniques offer quantitative density measurements.

    Purpose of the Study:

    • To investigate the operating characteristics of a reflection plate interferometer.
    • To present the necessary relations for understanding its performance.
    • To evaluate its suitability for fluid density gradient analysis.

    Main Methods:

    • Experimental investigation of a reflection plate interferometer.
    • Analysis of interferograms generated by the system.
    • Determination of optimal operating parameters and fringe characteristics.

    Main Results:

    • The reflection plate interferometer operates effectively within incident angles of 40-65 degrees.
    • Fringe spacing is inversely proportional to the shearing plate thickness.
    • Undisturbed fringe direction is adjustable relative to the test object.

    Conclusions:

    • The reflection plate interferometer provides high-quality interferograms.
    • It is a viable alternative to Schlieren systems for fluid density gradient measurement.