Investigation of Infrasound Background Noise at Mátra Gravitational and Geophysical Laboratory (MGGL)
Investigation of Infrasound Background Noise at Mátra Gravitational and Geophysical Laboratory (MGGL)
复制标题
马特拉重力和地球物理实验室 (MGGL) 的次声背景噪声调查
DOI：
10.3390/universe6010010
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发表时间：
2020
期刊：
影响因子：
2.9
通讯作者：
S. Czellár
中科院分区：
文献类型：
--
作者：
E. Fenyvesi;J. Molnár;S. Czellár
次声波和地震波是第三代地下引力波探测器重力梯度噪声（牛顿噪声）的主要来源。这种噪声将限制仪器在低于20赫兹频率下的灵敏度。在探测器的设计阶段，对其产生原因的调查和可能的缓解方法是重中之重。因此，需要在几个地下站点进行长期站点特征测量。但是，在某些地点可以进行采矿活动。这些活动会引起测量信号的突然变化（瞬态），也会增加连续的背景噪声。我们开发了一种基于离散哈尔变换的算法来寻找次声信号中的这些瞬态。我们发现，消除瞬态可以减少噪声谱的变化，从而更准确地表征连续背景噪声。我们进行了控制连续噪声的实验。矿井里运行的机器被系统地打开和关闭，以便观察它们对噪声谱的影响。试验结果表明，矿井通风系统是产生连续噪声的主要因素。我们还估计了MGGL的次声牛顿噪声对类似爱因斯坦望远镜的地下GW探测器应变噪声的贡献。
Infrasound and seismic waves are supposed to be the main contributors to the gravity-gradient noise (Newtonian noise) of the third-generation subterranean gravitational wave detectors. This noise will limit the sensitivity of the instrument at frequencies below 20 Hz. Investigation of its origin and the possible methods of mitigation have top priority during the designing period of the detectors. Therefore, long-term site characterizing measurements are needed at several subterranean sites. However, at some sites, mining activities can occur. These activities can cause sudden changes (transients) in the measured signal, and increase the continuous background noise, too. We have developed an algorithm based on discrete Haar transform to find these transients in the infrasound signal. We found that eliminating the transients decreases the variation of the noise spectra, and therefore results a more accurate characterization of the continuous background noise. We carried out experiments for controlling the continuous noise. Machines operating at the mine were turned on and off systematically in order to see their effect on the noise spectra. These experiments showed that the main contributor of the continuous noise is the ventilation system of the mine. We also estimated the contribution of infrasound Newtonian noise at MGGL to the strain noise of a subterranean GW detector similar to Einstein Telescope.
影响因子：
8.6
作者：
Abbott, B. P.;Abbott, R.;Zweizig, J.
通讯作者：
Zweizig, J.