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High-resolution bispectral imager at 1000 frames per second.

Marija Strojnik, Gonzalo Paez

    Optics Express
    |September 26, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a high-speed bispectral imaging instrument for analyzing flames. The advanced imager reveals flame dynamics like turbulence and oscillations in unprecedented detail.

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    Area of Science:

    • Optical Engineering
    • Combustion Science
    • Spectroscopy

    Background:

    • Bispectral imaging offers advantages over single-band imaging for analyzing complex phenomena.
    • Understanding flame dynamics is crucial for combustion control and safety.

    Purpose of the Study:

    • To introduce a novel bispectral imaging instrument capable of high-speed data acquisition.
    • To demonstrate the instrument's capability in analyzing dynamic flame behavior.

    Main Methods:

    • Development of a bispectral imager operating at 1000 frames per second.
    • Simultaneous imaging in two spectral bands (4.3 μm and 4.66 μm) using a single focal plane array.
    • Application to a methane flame from a Bunsen burner.

    Main Results:

    • Detection of bispectral puffing (2 Hz), pulsations, and oscillations (3 Hz) in flame radiation.
    • Observation of a quarter-period delay between oscillatory components in the two spectral bands.
    • Visualization of turbulence and vortex formation during flame-to-plume transition with 1-ms integration time.

    Conclusions:

    • The developed bispectral imager provides new insights into flame dynamics.
    • High-speed bispectral imaging is effective for studying transient combustion phenomena.
    • The instrument enables near-real-time display of bispectral ratioed flame images.