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Formulas are derived for the rms noise power and power spectrum observed by an ir detector adjacent to a turbulent flow layer. The power spectrum seen by a finite aperture is conveniently expressed in terms of the power spectrum observed by a point detector. Using a simple idealization of experimental results for the latter, the spectrum observed by a finite circular aperture is calculated. Aperture averaging appears to be surprisingly ineffective in limiting the noise spectrum unless wide apertures can be employed.
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