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海洋电场信号程控增益超低噪声采集系统设计
2022年电子技术应用第2期
刘兰军1,2,周亚涛1,陈家林1,2,黎 明1,2,强嘉晨1,谢 鹏1
1.中国海洋大学 工程学院,山东 青岛266100;2.山东省海洋智能装备技术工程研究中心,山东 青岛266100
摘要: 针对海洋电磁勘探中微弱动态电场信号的宽测量范围需求,提出了一种电场信号程控增益超低噪声采集(Programmable Gain Ultra-Low Noise Acquisition,PGULNA)方法,给出了系统设计实现。设计的程控增益超低噪声采集电路以低噪声运算放大器为核心,将D/A转换器内部电阻网络作为可编程反馈电阻,通过改变D/A转换器数字控制量进行电路增益调整。给出了所设计的PGULNA电路的理论噪声分析,本底噪声密度理论分析结果为1.84 nV/√Hz@1 Hz。开展了实验室环境测试,测试结果表明,电路通道之间一致性良好,本底噪声密度约为2.6 nV/√Hz@1 Hz,程控增益为1~128倍8挡可调,能够满足海洋电磁勘探中微弱电场信号的宽测量范围采集需求。
中图分类号: P631.3
文献标识码: A
DOI:10.16157/j.issn.0258-7998.211687
中文引用格式: 刘兰军,周亚涛,陈家林,等. 海洋电场信号程控增益超低噪声采集系统设计[J].电子技术应用,2022,48(2):91-95,100.
英文引用格式: Liu Lanjun,Zhou Yatao,Chen Jialin,et al. Design of ultra low noise acquisition system with programmable gain for marine electric field signal[J]. Application of Electronic Technique,2022,48(2):91-95,100.
Design of ultra low noise acquisition system with programmable gain for marine electric field signal
Liu Lanjun1,2,Zhou Yatao1,Chen Jialin1,2,Li Ming1,2,Qiang Jiachen1,Xie Peng1
1.College of Engineering,Ocean University of China,Qingdao 266100,China; 2.Shandong Engineering Research Center of Marine Intelligent Equipment and Technology,Qingdao 266100,China
Abstract: Aiming at the wide measurement range of weak dynamic electric field signals in marine electromagnetic exploration, a method of Programmable Gain Ultra Low Noise Acquisition(PGULNA) for electric field signals is proposed in this paper, and the system design and implementation are given. The designed programmable gain ultra-low noise acquisition circuit takes the low-noise operational amplifier as the core, takes the internal resistance network of the D/A converter as the programmable feedback resistor, and adjusts the circuit gain by changing the digital control quantity of the D/A converter. The theoretical noise analysis of the designed PGULNA circuit is given, and the theoretical analysis result of background noise density is 1.84 nV/√Hz@1 Hz. The laboratory environment test results show that the consistency between circuit channels is good, the background noise density is about 2.6 nV/√Hz@1 Hz, and the programmable gain can be adjusted from 1 to 128 times by 8 levels, which can meet the requirements of collecting weak electric field signals in a wide measurement range in Marine electromagnetic exploration.
Key words : marine electromagnetism;electric field signal;programmable gain;ultra-low noise amplification;measurement range

0 引言

    我国海洋面积广阔,海洋油气资源丰富。在海洋油气资源探测过程中,面对愈加复杂的探测对象,传统而单一的三维地震探测逐渐显得力不从心[1]海洋电磁勘探方法作为海洋地震勘探的重要补充手段[2],具有高阻异常识别能力,能够判断储层中含油或是含水[3],在油气资源探测和估算中发挥着越来越重要的作用[4-5],成为全球各大物探公司发展的新兴业务之一[6]




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作者信息:

刘兰军1,2,周亚涛1,陈家林1,2,黎  明1,2,强嘉晨1,谢  鹏1

(1.中国海洋大学 工程学院,山东 青岛266100;2.山东省海洋智能装备技术工程研究中心,山东 青岛266100)





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