Wind noise minimization for single infrasonic sensors.

Abstract

One of the main limitations in outdoor infrasound measurements in open areas is the noise generated by turbulent winds. Pipe arrays or arrays constructed using porous hoses are often used to average out the pressure fluctuations from the turbulence. These devices have a limited useful bandwidth, since they also average out the acoustic response at higher frequencies and distort received acoustic waveforms. We have investigated relatively small configurations to reduce wind noise based on our research into low‐frequency wind noise over open outdoor surfaces. Such devices may be useful for temporary arrays for which waveform integrity is more important than wind noise reduction at very low frequencies. In this talk, we present results for infrasonic sensors placed bare on the surface, mounted underneath a flush metal foam flat surface, and under two types of hemispherical dome. For reference, these will be compared to and contrasted with wind noise measurements with barriers and pipe arrays previously repor...