宽频地震仪数据采集通道的噪声分析
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摘要
为了从噪声理论角度验证宽频地震仪数据采集通道低噪声设计的合理性,采用等效En-In噪声模型理论和噪声的计算方法,对数据采集通道的固有噪声进行了分析与计算。通过实验结果及理论分析证明了所设计的宽频地震仪等效输入噪声小于2μV,满足系统噪声设计要求。同时实验结果与理论计算趋于一致,证明了此理论方法适合地震仪数据采集通道的噪声分析,为地震仪数据采集通道的低噪声设计奠定了基础。
In order to prove the rationality of low noise design of data acquisition module in broadband seismic recorder from the noise theory aspect,the equivalent E_n-I_n noise model theory and the calculated method of noise were adopted t o analyze and calculate the noise in data acquisition channel.It is proved that the equivalent input noise less than 2 μv meets the criterion through the expe riment result and the theory analysis.Furthermore,the experiment result approa ches the theoretical value,so the theory can be used in analyzing the noise of seismic recorder.This provides foundations for low noise design in data acquisi tion section in broadband seismic recorder.
In order to prove the rationality of low noise design of data acquisition module in broadband seismic recorder from the noise theory aspect,the equivalent E_n-I_n noise model theory and the calculated method of noise were adopted t o analyze and calculate the noise in data acquisition channel.It is proved that the equivalent input noise less than 2 μv meets the criterion through the expe riment result and the theory analysis.Furthermore,the experiment result approa ches the theoretical value,so the theory can be used in analyzing the noise of seismic recorder.This provides foundations for low noise design in data acquisi tion section in broadband seismic recorder.
引文
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[2]钱荣毅,曾校丰.REFTEK宽频地震观测仪器系统和野外数据采集[J].物探装备,2004,14(1):52-54.QIAN Rong-yi,ZENG X iao-feng.System of REFTEK B road Band Se ism ic Observation Instrum ent and F ield Data Acqu isition[J].Equ ipm ent for Geophysical Prospecting,2004,14(1):52-54.
[3]刘益成,易碧金.地震仪噪音零漂的测试原理和计算方法研究[J].物探装备,2005,15(3):75-76.LIU Y i-cheng,Y I B i-jin.Test Princ ip le and Computing A lgorithm ofNoise Zero D rift of Se ismograph[J].Equ ipm ent forGeo-physical Prospecting,2005,15(3):75-76.
[4]袁子龙,李婷婷.Σ-ΔA/D转换技术及在地震勘探中的应用[J].地球物理学进展,2004,19(2):300-303.YUAN Z i-long,LI Ting-ting.TheΣ-ΔA/D Converting Techn ique and Its App lication in Se ism ic Exp loration[J].Progress inGeophysics,2004,19(2):300-303.
[5]戴逸松.电子系统噪声及低噪声设计方法[M].长春:吉林人民出版社,1984.DAI Y i-song.Noise of E lectron ic System and M ethod of Low Noise Design[M].Changchun:Jilin Peop le Pub lish ing House,1984.
[6]王军,戴逸松.集成运算放大器同相和反相形式En-In噪声分析和比较[J].电子科学学刊,1998,20(2):199-205.WANG Jun,DAI Y i-song.TheEn-InNoise Analysis and Comparison of In-Phase and Inverting Form s of Integrated OperationalAmp lifier[J].Journal of E lectron ics,1998,20(2):199-205.
[7]MOTCHENBACHER C D,CONNELLY J A.Low-Noise E lectron ic System Design[M].New York:W iley,1993.
[8]曹广华,袁子龙.高分辨率地震仪Σ-ΔA/D转换器的噪声整形[J].大庆石油学院学报,2002,26(1):8-12.CAO Guang-hua,YUAN Z i-long.Noise Shap ing inΣ-ΔA/D Converter in H igh Resolution Se ismogram s[J].Journal ofDaq ing Petroleum Institute,2002,26(1):8-12.
[9]查理.A.弗格斯.电噪声手册[M].北京:计量出版社,1982.CHARLES A VERGERS.Handbook of E lectrical Noise[M].Be ijing:M etrology Pub lish ing House,1982.
[10]梁志国,朱济杰.数据采集系统动态噪声的评价方法[J].现代计量测试,1999(3):23-26.LIANG Zh i-guo,ZHU Ji-jie.An Evaluation M ethod for the Dynam ic Noise of Data Acqu isition System[J].Modern M easure-m ent and Test,1999(3):23-26.
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