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Infrared noise caused by turbulent flows.

L S Taylor

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    Summary
    This summary is machine-generated.

    Formulas quantify infrared detector noise power and spectra from turbulent flow. Finite aperture averaging is ineffective for noise reduction unless apertures are very wide.

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    Area of Science:

    • Physics
    • Optical Engineering

    Background:

    • Infrared (IR) detectors are susceptible to noise from adjacent turbulent flow.
    • Understanding and mitigating this noise is crucial for accurate IR measurements.

    Purpose of the Study:

    • To derive formulas for root-mean-square (rms) noise power and power spectrum observed by an IR detector near turbulent flow.
    • To analyze the effect of finite aperture size on the observed noise spectrum.

    Main Methods:

    • Derivation of mathematical formulas for noise power and power spectrum.
    • Expression of the finite aperture power spectrum in terms of the point detector power spectrum.
    • Calculation of the spectrum for a finite circular aperture using idealized experimental data.

    Main Results:

    • Formulas for rms noise power and power spectrum were successfully derived.
    • Aperture averaging showed limited effectiveness in reducing noise spectrum.
    • Significant noise reduction requires the use of very wide apertures.

    Conclusions:

    • The derived formulas provide a quantitative understanding of IR detector noise in turbulent environments.
    • Finite aperture averaging is not a universally effective method for noise suppression.
    • Future IR system designs should consider the implications of aperture size on noise performance.