Abstract

The design of passive infrared detection systems requires a knowledge of the sea-horizon background noise. The horizontal wave-number distribution of noise from the sky immediately above and the sea immediately below the horizon was measured during 1956 and 1957. The measurements, which are discussed in this paper, included the range of wave numbers from 7.1 to 91 cycles/rad. The results are graphed in terms of the one-dimensional angular Wiener spectrum of the background noise as a function of the horizontal wave number and show that both the sky and sea noise spectra are inversely proportional to the 1.7 power of the wave number in the region from 14 to 91 cycles/rad. A brief discussion of the analyzing equipment is also included.

© 1959 Optical Society of America

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