GustBuster

Vipac Engineers and Scientists has addressed the problem of wind noise in unattended blast noise monitoring by developing GustBuster. With GustBuster, a light-weight, cylindrical windscreen, blast noise can be measured even under very windy conditions. The device consists of weather resistant materials and dramatically reduces the effects of low frequency wind noise. Easy to attach to any monitoring station, GustBuster measures 400mmx400mm.

Low frequency wind noise results from turbulence. Most of the acoustic energy resulting from a blast occurs well below 100Hz, in the same region of the spectrum as turbulence. Through testing different types of flow resistant materials in different configurations, Vipac has developed a windscreen to reduce wind turbulence without affecting the accuracy of the blast noise measurement itself.

This windscreen allows identification of acoustic signals resulting from a blast, whilst cutting out wind noise generated by turbulence.

Noise generated by 50km/h wind The following graph displays the reduction in wind noise achieved by GustBuster. An overall reduction of 20dB at windspeeds of 50km/h to 70km/h has been demonstrated. GustBuster has a transmission loss to acoustic signals of 0.2dB at 100Hz.

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