Wind noise reduction in infrasound and near-infrasound measurements

Outdoor infrasound and near-infrasound measurements are limited by wind noise. Often porous hoses or pipe arrays are utilized to take advantage of large spacial averaging of the turbulence induced pressures. However, those devices can reduce the integrity of the acoustic signal that is of interest. In those cases, smaller devices are required and different noise reduction techniques need to be considered. We will present data from low frequency sensors placed on the bare ground, placed in the ground under a piece of foam mounted flush to the surface, and under a large hemispherical foam dome. This data will also be compared to similar measurements with porous hoses. This work will illustrate that the screening technique one should use is dependent on the frequency range of interest and will also provide a best-case approach for typical measurements.