Wind-induced microphone noise complicates infrasound measurements considerably. A wind-shielding dome for signal-to-noise ratio improvement of acoustic pressure infrasound frequencies was designed and tested. The semi-spherical shape aimed at maximizing the pressure averaging of large atmospheric turbulent eddies while keeping the structure reasonably compact. The insertion loss of the dome was measured in a semi-anechoic chamber (in absence of flow) and showed nearly full transparency in the low frequency range. In an outdoor test, wind turbine infrasound was simultaneously measured with an uncovered and a dome-covered low-frequency microphone under different wind speeds and turbulence intensities. Largest improvements of the signal-to-noise ratio were measured at high mean wind speeds for frequencies down to 0.5 Hz. The dome allowed to clearly identify the infrasonic tonal components of wind turbines that were otherwise completely covered by the wind-induced microphone noise even at low mean wind speeds. The use of the dome thus opens possibilities for more accurately measuring infrasonic immissions from e.g. wind turbines.

风引起的麦克风噪声使次声测量变得相当复杂。设计并测试了用于改善声压次声频率信噪比的防风罩。半球形的形状旨在使大型湍流涡流的压力平均最大化，同时保持结构合理紧凑。在半消声室中（没有流动的情况下）测量圆顶的插入损耗，并在低频范围内显示出几乎完全的透明性。在室外测试中，在不同的风速和湍流强度下，用一个未覆盖的和一个圆顶覆盖的低频麦克风同时测量了风力涡轮机的次声。在低至0.5 Hz的频率下，以高平均风速测量了信噪比的最大改进。圆顶可以清楚地识别出风力涡轮机的次声调成分，否则，即使在低平均风速下，该声调成分也完全被风声传声器的噪音所覆盖。因此，圆顶的使用为更精确地测量来自例如风力涡轮机的次声辐射提供了可能性。