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Wind-induced noise in a screened microphone
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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 .

Image of FIG. 3.
FIG. 3.

A-weighted broadband pressure level caused by atmospheric or wake turbulence with , .

Image of FIG. 4.
FIG. 4.

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).

Image of FIG. 5.
FIG. 5.

Same as Fig. 4, but after fitting with stability function .

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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 .

Image of FIG. 8.
FIG. 8.

Measured (line with markers) and calculated screening effect of a relative to a 2.4 or diameter wind screen.

Image of FIG. 9.
FIG. 9.

Frequency distributions of stability factor at 2 and height, based on observations over 1987 (bars) and resulting from fitted spectra (open circles); class : .


Generic image for table

Measurement characteristics.


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Scitation: Wind-induced noise in a screened microphone