Infrasound sensors record the ambient acoustic field that contains not only signals of interest but also noise and clutter. Noise is defined as atmospheric turbulence that is incoherent over the distances of meters, whereas, signals of interest and clutter are acoustic pressure waves that are coherent over 10s of meters to 100s of kilometers. There is a growing interest in monitoring sources that extend across the acoustic spectrum from infrasound (below 20 Hz) into the low‐end audible acoustic (20–1000 Hz). Monitoring of these extended band signals with a single sensor is made possible with the development of contemporary infrasound sensors, such as Hyperion IFS‐3000 with a flat response from 0.01 to 1000 Hz. Combining infrasound sensors with seismometers provides opportunity to better assess noise contributions for both sensor types and improve characterization of sources that occur close to the solid earth–atmosphere boundary. Because sensors are installed to target these broadband acoustic sources, considerations need to be made when selecting a mechanical wind filter to mitigate the noise, while minimizing the impacts to the signals of interest across these frequency ranges. Motivated by these opportunities, this article compares traditional infrasound wind filter designs, that is, porous hoses rosettes and domes, in an urban setting for frequencies 0.01–45 Hz. Data analysis compares the filters, in terms of their response to noise and signals with direct comparisons of wind filters, as a function of frequency. The quantification of performance of these filters in an urban setting provides insight into their effects on detection of sources of interest in this environment.

中文翻译：

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用于次声传感器降噪的机械风过滤器的比较

次声传感器记录的环境声场不仅包含感兴趣的信号，还包含噪声和杂波。噪声被定义为在数米距离内不相干的大气湍流，而感兴趣的信号和杂波是在数十米到数百公里内相干的声压波。人们对从次声（低于 20 Hz）延伸到低端可听声学（20-1000 Hz）的声学频谱的监测源越来越感兴趣。随着现代次声传感器（例如具有 0.01 至 1000 Hz 平坦响应的 Hyperion IFS-3000）的发展，使用单个传感器监测这些扩展频带信号成为可能。将次声传感器与地震仪相结合，为更好地评估两种传感器类型的噪声贡献提供了机会，并改进了发生在固体地球大气边界附近的源的表征。由于安装了传感器以瞄准这些宽带声源，因此在选择机械风过滤器以减轻噪音时需要考虑，同时最大限度地减少对这些频率范围内感兴趣的信号的影响。受这些机会的启发，本文比较了城市环境中频率为 0.01–45 Hz 的传统次声风过滤器设计，即多孔软管玫瑰花结和圆顶。数据分析将滤波器在噪声和信号响应方面与风滤波器的直接比较进行比较，作为频率的函数。