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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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Measurement of temperature using speckle shearing interferometry.

C Shakher, A K Nirala

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

    A new laser speckle shearing interferometry method accurately measures gaseous flame temperatures. This technique offers easier implementation compared to speckle photography, showing good agreement with thermocouples.

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    Area of Science:

    • Optical diagnostics
    • Thermometry
    • Fluid dynamics

    Background:

    • Accurate temperature measurement in gaseous flames is crucial for combustion analysis.
    • Traditional methods like thermocouples can disturb the flame, while optical methods offer non-intrusive alternatives.
    • Speckle-based techniques have shown promise for flame diagnostics.

    Purpose of the Study:

    • To introduce and validate a laser speckle shearing interferometric technique for measuring temperature profiles in gaseous flames.
    • To compare the performance and ease of implementation of this new technique against established methods.

    Main Methods:

    • Utilized laser speckle shearing interferometry to capture interferograms of a gaseous flame.
    • Acquired temperature data using a thermocouple for comparison.
    • Employed speckle photography as another comparative optical diagnostic technique.

    Main Results:

    • Demonstrated good agreement between temperature profiles measured by laser speckle shearing interferometry, speckle photography, and thermocouple.
    • Laser speckle shearing interferometry proved easier to implement than speckle photography.
    • Eliminated the need for point-by-point analysis and halo effect correction inherent in speckle photography.

    Conclusions:

    • Laser speckle shearing interferometry is a viable and user-friendly technique for non-intrusive flame temperature profiling.
    • This method offers advantages in fringe analysis and implementation complexity over speckle photography.
    • The technique shows potential for advanced combustion research and diagnostics.