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海洋電場信號程控增益超低噪聲采集系統(tǒng)設(shè)計
2022年電子技術(shù)應(yīng)用第2期
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(xué) 工程學(xué)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
摘要: 針對海洋電磁勘探中微弱動態(tài)電場信號的寬測量范圍需求,提出了一種電場信號程控增益超低噪聲采集(Programmable Gain Ultra-Low Noise Acquisition,PGULNA)方法,給出了系統(tǒng)設(shè)計實現(xiàn)。設(shè)計的程控增益超低噪聲采集電路以低噪聲運算放大器為核心,將D/A轉(zhuǎn)換器內(nèi)部電阻網(wǎng)絡(luò)作為可編程反饋電阻,通過改變D/A轉(zhuǎn)換器數(shù)字控制量進行電路增益調(diào)整。給出了所設(shè)計的PGULNA電路的理論噪聲分析,本底噪聲密度理論分析結(jié)果為1.84 nV/√Hz@1 Hz。開展了實驗室環(huán)境測試,測試結(jié)果表明,電路通道之間一致性良好,本底噪聲密度約為2.6 nV/√Hz@1 Hz,程控增益為1~128倍8擋可調(diào),能夠滿足海洋電磁勘探中微弱電場信號的寬測量范圍采集需求。
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(shè)計[J].電子技術(shù)應(yīng)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(fù)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(wù)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(xué) 工程學(xué)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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