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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。
中圖分類號: P631.3
文獻標識碼: A
DOI:10.16157/j.issn.0258-7998.211687
中文引用格式: 劉蘭軍,周亞濤,陳家林,等. 海洋電場信號程控增益超低噪聲采集系統(tǒng)設計[J].電子技術(shù)應用,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

    我國海洋面積廣闊,海洋油氣資源豐富。在海洋油氣資源探測過程中,面對愈加復雜的探測對象,傳統(tǒng)而單一的三維地震探測逐漸顯得力不從心[1]。海洋電磁勘探方法作為海洋地震勘探的重要補充手段[2],具有高阻異常識別能力,能夠判斷儲層中含油或是含水[3],在油氣資源探測和估算中發(fā)揮著越來越重要的作用[4-5],成為全球各大物探公司發(fā)展的新興業(yè)務之一[6]




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作者信息:

劉蘭軍1,2,周亞濤1,陳家林1,2,黎  明1,2,強嘉晨1,謝  鵬1

(1.中國海洋大學 工程學院,山東 青島266100;2.山東省海洋智能裝備技術(shù)工程研究中心,山東 青島266100)





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