| 甚宽频带地震计噪声与环境耦合研究 |
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| 引用本文： | 马鑫,周云耀,吕永清.甚宽频带地震计噪声与环境耦合研究[J].西北地震学报,2019,41(2):545-548. |
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| 作者姓名： | 马鑫 周云耀 吕永清 |
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| 作者单位： | 中国地震局地震研究所, 中国地震局地震大地测量重点实验室, 湖北 武汉 430071,中国地震局地震研究所, 中国地震局地震大地测量重点实验室, 湖北 武汉 430071,中国地震局地震研究所, 中国地震局地震大地测量重点实验室, 湖北 武汉 430071 |
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| 基金项目： | 中国地震局地震科技星火计划（XH16028）；中国地震局地震研究所基本科研业务费专项资助项目和中国地震局地壳应力研究所基本科研业务费专项资助项目（ISO201556236） |
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| 摘 要： | 首先以甚宽频带地震计为研究对象,分析垂直向的片簧系统理论模型,探讨气压变化对仪器的LP噪声影响;通过理论分析,得出垂直向的片簧系统受气压变化影响较大。根据片簧系统的理论模型,设计一种密封安装方法,通过实验探讨地震计噪声与环境耦合关系(气压、温度和底座变形的关系)。最后对实验数据进行功率谱噪声分析,结果显示抽真空后地震计三个分向的噪声均降低,其中在100 s处垂直向、东西和南北向分别降低了10 dB、5 dB和6 dB。
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| 关 键 词： | 甚宽频带地震计 噪声 环境耦合 功率谱 |
| 收稿时间： | 2017/7/27 0:00:00 |
Coupling Relationship between Noise of a Very BroadSeismometer and the Environment |
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| MA Xin,ZHOU Yunyao and L&#; Yongqing.Coupling Relationship between Noise of a Very BroadSeismometer and the Environment[J].Northwestern Seismological Journal,2019,41(2):545-548. |
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| Authors: | MA Xin ZHOU Yunyao and L&#; Yongqing |
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| Institution: | Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Agency, Wuhan 430071, Hubei, China,Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Agency, Wuhan 430071, Hubei, China and Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Agency, Wuhan 430071, Hubei, China |
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| Abstract: | In this study, the theoretical model of the vertical leaf spring system for very broadband seismometers was analyzed, and the influence of pressure changes on the LP noise of the instrument is discussed. The theoretical analysis showed that the vertical leaf spring system is quite affected by pressure changes. Then, according to the theoretical model of the leaf spring system, a kind of sealing installation method was designed, and the coupling relationship between the noise and the environment (pressure, temperature, and the base deformation) is discussed through experiments. Finally, the power spectrum noise analysis results of the experimental data showed that, after vacuuming, the noise in the three branch directions of the seismometer was reduced, at 100 s, by 10 dB, 5 dB, and 6 dB in the vertical direction, east-west direction, and north-south direction, respectively. |
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| Keywords: | very broadband seismometer noise environmental coupling power spectrum |
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