Acoustical Effects of Wind Screens on Infrasound Measurements
AbstractSwallow Acoustic Consultants Ltd (SACL) conducted a two-week long measurement program to determine audible sound and infrasound levels at five homes in the Municipality of Kincardine, Ontario. The results of these acoustical measurements, conducted both outside and inside of each home, are discussed; along with comparisons to meteorological data obtained at one of the residences. In the absence of technically substantive information to the contrary, a standard 60 mm diameter open-cell foam wind screen was utilized for both outdoor and indoor measurements. Wind speeds ranged from 0 to 17 m/s with 24-hr daily averages as high as 12 m/s. During the course of the data analysis, of unweighted, A-weighted, and G-weighted results, SACL noted that high wind speeds appeared to have compromised some of the data collection. A methodology for filtering good/bad data is discussed. Furthermore, SACL undertook a wide ranging literature review of the technical and regulatory documentation pertaining to the use of wind screens. After this review, the lack of technical justification for the use of a wind screen has become apparent, despite their conventional utilization.
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