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RESULTS OF TESTS INVOLVING HEMISPHERICAL WIND SCREENS IN THE REDUCTION OF WIND NOISE,
ATMOSPHERIC SCIENCES LAB WHITE SANDS MISSILE RANGE N MEX
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Hemispherical wind screens, covered with screen mesh and acoustic cloth, are of considerable value in reducing wind noise associated with infrasonic monitoring devices and improving the signal-to-noise ratio as shown in field and wind tunnel tests. The amplitude of the wind noise below sixteen 16 cps was significantly reduced and noise components at higher frequencies were effectively eliminated. Comparison tests showed that wind screens of three feet in diameter are more effective for noise reduction than the method used in the SOTIM sonic observation of the trajectory and impact of missiles system. Author
APPROVED FOR PUBLIC RELEASE