Wind-induced noise in a screened microphone
Solid lines: octave band pressure levels due to atmospheric turbulence on a screened microphone with , , at wind speeds of (bottom to top) 2, 4, 6, 8, and ; dashed lines: presssure levels at same wind speeds according to Strasberg.
Linear (dashed) and A-weighted (solid lines) -octave pressure levels due to atmospheric turbulence on a screened microphone with , , at wind speeds of (bottom to top) 2, 4, 6, 8, and ; thick gray line: A-weighted pressure level according to Strasberg at .
A-weighted broadband pressure level caused by atmospheric or wake turbulence with , .
Reduced octave band pressure levels at different wind speeds (in legend: m/s), bold line is predicted spectrum. Left: unscreened microphone, from Larsson et al. (open symbols) and Boersma (black); middle: screened microphone, from Larsson et al. (open symbols), Jakobsen et al. (gray), and Boersma (black); right: screened microphone, measurements in Horsterwold (open symbols), Kwelder (gray) and Zernike (black).
Same as Fig. 4, but after fitting with stability function .
Values of stability function after fitting reduced spectral levels with theoretical spectrum, for measurements in day or night time, and for unscreened microphones in daytime.
Measurements during a storm on May 28, 2000 in front of a big shed; left: averages of wind speeds at microphone height and height and equivalent sound pressure level ; right: as a function of microphone wind speed and predicted sound pressure level for three values of .
Measured (line with markers) and calculated screening effect of a relative to a 2.4 or diameter wind screen.
Frequency distributions of stability factor at 2 and height, based on observations over 1987 (bars) and resulting from fitted spectra (open circles); class : .
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