The importance of instrument location on barometric pressure-induced noise
The importance of instrument location on barometric pressure-induced noise
复制标题
仪器位置对气压引起的噪声的重要性
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
H. Steffen
中科院分区：
文献类型：
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作者：
H. Steffen
在宽带地震仪、应变仪和倾斜仪的记录中，气压引起的噪声是分析地球内部结构和性质的数据的主要限制因素之一。甚至连黑森林天文台(BFO)的仪器也受到了影响，这些仪器安装在170米深的山上，在气闸门后面。我们用BFO有限元模型的LP研究了压力噪声的物理传递机制，重点讨论了压力变化对拱顶内不同位置的水平分量的影响，例如在圆柱体和壁龛上。结果表明，在1m的距离内，噪声放大倍数可达37倍，且被测分量的方向发生变化。每个组件受到不同的影响，这使得确定最佳位置变得困难。此外，以前的结果可以得到证实，并可以得出修正建议。
Barometric pressure-induced noise in records of broadband seismometers, strainmeters and tiltmeters is one of the major limiting fac tors in analyzing the data for studies of the Earth’s interior structure and prope ties. Even the instruments at the Black Forest Observatory (BFO), installed in a d epth of 170 m in a mountain behind an air-lock door, are influenced. We invest igate the physical transfer mechanisms for pressure-induced noise with the he lp of a Finite Element model of the BFO, emphasizing the effect of pressure changes on the horizontal components at different locations inside a vault, e. g. on pi ers and in niches. The results show noise amplification factors of up to 37 within a d istance of 1 m, and changes in the direction of the measured components. Each co mponent is influenced differently, which makes it difficult to determine the best location to place. In addition, former results can be confirmed and suggestions for a correction can be drawn.