STUDY OF THE RESPONSE OF AN INFRASOUND STATION: MB3 AND WIND NOISE REDUCTION SYSTEMS
Authors: Marc Escudier (Enviroearth), Nathalie Olivier (SeismoWave)
SeismoWave and Enviroearth, manufacturers, installers and operators of infrasound stations all over the world, have come together to improve the instrumentation on infrasound measuring stations.
The MB3d microbarometer is a new sensor that embeds a digitizer with remote calibration capabilities. With 1 Gb miniseed data storage, and less than 1W consumption, this sensor is an effective solution for temporary applications.
The Wind Noise Reduction System (also known as WNRS) are air inlets that allow to filtrate noise of the wind and the surrounding environment, improving the signal over noise ratio. New designs were made recently and the power spectral density graphs of two systems will be shown. At a frequency close to 1Hz, these filters can reduce up to 20dB the impact of the surrounding noise, although the attenuation depends on the kind of filter and the frequency.
We are also in the process of designing and developing an all-inclusive portable infrasound station and would like to discuss with the participants our first findings.