地震数据采集器自噪声检测研究

许卫卫

许卫卫. 2017: 地震数据采集器自噪声检测研究. 地震学报, 39(5): 806-813. DOI: 10.11939/jass.2017.05.014
引用本文: 许卫卫. 2017: 地震数据采集器自噪声检测研究. 地震学报, 39(5): 806-813. DOI: 10.11939/jass.2017.05.014
Xu Weiwei. 2017: Self-noise tests on seismic dataloggers. Acta Seismologica Sinica, 39(5): 806-813. DOI: 10.11939/jass.2017.05.014
Citation: Xu Weiwei. 2017: Self-noise tests on seismic dataloggers. Acta Seismologica Sinica, 39(5): 806-813. DOI: 10.11939/jass.2017.05.014

地震数据采集器自噪声检测研究

基金项目: 

国家自然科学基金(41474047)资助

国家自然科学基金 41474047

详细信息
    作者简介:

    许卫卫  中国地震局地球物理研究所副研究员. 2005年中国科学院地质与地球物理研究所固体地球物理学专业毕业,获理学博士学位.曾从事利用接收函数研究地壳上地幔结构方面的研究,现主要从事地震观测技术方面的研究工作,包括地震仪器性能评价、地震观测数据质量控制等.

    通讯作者:

    许卫卫, e-mail: wwxuww@sina.com

  • 中图分类号: P315.61

Self-noise tests on seismic dataloggers

  • 摘要: 本文采用多通道相关分析方法测量并分析研究了国内地震观测常用的6种进口地震数据采集器的自噪声.结果表明:6种进口地震数据采集器无论在普通增益还是高增益模式下,当频带范围处于1 Hz以下时,自噪声均低于NLNM低噪声模型(灵敏度按750 V·s/m换算);在低增益模式下,当频带范围处于1 Hz以上时,各数据采集器的自噪声与NLNM低噪声模型高低交错,须根据观测目的谨慎使用;Q330HRS和Reftek-130/130S型数据采集器的高增益模式较适合测量宽频带地震计的自噪声.
    Abstract: The self-noises of the seismic dataloggers have significant meaning for self-noise measurement of seismometers and dynamic range evaluation of broadband seimographs. In this study, we measured and analyzed the self-noises of six types of imported seismic dataloggers widely used in Chinese seismic observations based on multi-channel correlation analysis method. The results showed that self-noises of all six types of dataloggers are well below NLNM model when frequency domain is below 1 Hz in both high-gain and unity-gain modes by sensitivity conversion factor 750 V·s/m; however, for the frequency domain higher than 1 Hz, self-noises of the six types of dataloggers interlace with NLNM model, hence much care should be taken according to the goals of seismic observation. Reftek-130/130S and Q330HRS with high-gain sampling mode might be the preferable choice for the seismometer's self-noise measurements.
  • 图  1   不同采样率(a)和不同信号源接入(b)下Reftek-130S型数据采集器自噪声测量得到的功率谱密度(PSD)对比

    Figure  1.   Comparison of PSD from self-noises of seismic dataloggers Reftek-130S measured with different sampling frequencies (a) and different signal sources (b)

    图  2   6种地震数据采集器自噪声测试得到的功率谱密度(PSD)结果

    括号中数值表示增益选择. (a) Reftek; (b) Kinemetrics; (c) Nanometrics

    Figure  2.   The PSD resulted from self-noise test of six types of seismic dataloggers

    Numbers in brackets represent gain selection. (a) Reftek; (b) Kinemetrics; (c) Nanometrics

    图  3   数据采集器与地震计自噪声功率谱密度(PSD)比较图

    Figure  3.   The comparison of PSD of self-noises between seismic dataloggers and seismometers

    表  1   检测所用地震数据采集器的具体参数

    Table  1   The detailed parameters of seismic dataloggers used in the test

    数据采集器型号 通道数 序列号 增益档及其对应量程
    Reftek-130S 6 BD24, BD80 普通增益,±10 V;高增益,±0.3125 V
    Reftek-130 3 AF6C, AF74, AF85 普通增益,±10 V;高增益,±0.3125 V
    Reftek-130B 3 9B05, 9B5F, 9C86 普通增益,±10 V
    Q330HRS 6 4557, 4546 普通增益,±20 V;高增益(26位),±1 V(26位);普通增益,±20 V;高增益(24位),±0.67 V(24位)
    Taurus 3 002688 ×2,±1 V;×4,±2 V;×8,±4 V;×16,±8 V;×40,±20 V
    Centaur 3 000413 ×1,±0.5 V;×2,±1 V;×4,±2 V;×10,±5 V;×20,±10 V; ×40,±20 V
    下载: 导出CSV
  • 滕云田, 胡星星, 王喜珍, 王晓美, 卢红娅, 王喆, 张旸. 2016.用多通道AD分级采集扩展地震数据采集器的动态范围[J].地球物理学报, 59(4): 1435-1445. doi: 10.6038/cjg20160424

    Teng Y T, Hu X X, Wang X Z, Wang X M, Lu H Y, Wang Z, Zhang Y. 2016. Extending dynamic range of the seismic data acquisition system by using multi-channel ADC[J]. Chinese Journal of Geophysics, 59(4): 1435-1445 (in Chinese). doi: 10.6038/cjg20160424

    Evans J R, Followill F, Hutt C R, Kromer R P, Nigbor R L, Ringler A T, Steim J M, Wielandt E. 2010. Method for calculating self-noise spectra and operating ranges for seismographic inertial sensors and recorders[J]. Seismol Res Lett, 81(4): 640-646. doi: 10.1785/gssrl.81.4.640

    Holcomb G L. 1989. A Direct Method for Calculating Instrument Noise Levels in Side-By-Side Seismometer Evaluations[R]. Albuquerque, New Mexico: U.S. Geological Survey: 89-214.

    Ringler A T, Hutt C R. 2010. Self-noise models of seismic instruments[J]. Seismol Res Lett, 81(6): 972-983. doi: 10.1785/gssrl.81.6.972

    Sleeman R, van Wettum A, Trampert J. 2006. Three-channel correlation analysis: A new technique to measure instrumental noise of digitizers and seismic sensors[J]. Bull Seismol Soc Am, 96(1): 258-271. doi: 10.1785/0120050032

    Sleeman R, Melichar P. 2012. A PDF representation of the STS-2 self-noise obtained from one year of data recorded in the Conrad Observatory, Austria[J]. Bull Seismol Soc Am, 102(2): 587-597. doi: 10.1785/0120110150

    Welch P. 1967. The use of fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms[J]. IEEE Trans Audio Electroacous, 15(2): 70-73. doi: 10.1109/TAU.1967.1161901

图(3)  /  表(1)
计量
  • 文章访问数:  812
  • HTML全文浏览量:  420
  • PDF下载量:  91
  • 被引次数: 0
出版历程
  • 收稿日期:  2016-09-20
  • 修回日期:  2016-12-11
  • 发布日期:  2017-08-31

目录

    /

    返回文章
    返回