海洋電場(chǎng)信號(hào)程控增益超低噪聲采集系統(tǒng)設(shè)計(jì)
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(qiáng)嘉晨1，謝 鵬1
1.中國(guó)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(duì)海洋電磁勘探中微弱動(dòng)態(tài)電場(chǎng)信號(hào)的寬測(cè)量范圍需求,，提出了一種電場(chǎng)信號(hào)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(jì)實(shí)現(xiàn),。設(shè)計(jì)的程控增益超低噪聲采集電路以低噪聲運(yùn)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(guò)改變D/A轉(zhuǎn)換器數(shù)字控制量進(jìn)行電路增益調(diào)整,。給出了所設(shè)計(jì)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(kāi)展了實(shí)驗(yàn)室環(huán)境測(cè)試,，測(cè)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(chǎng)信號(hào)的寬測(cè)量范圍采集需求。
中圖分類號(hào)： P631.3
文獻(xiàn)標(biāo)識(shí)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(chǎng)信號(hào)程控增益超低噪聲采集系統(tǒng)設(shè)計(jì)[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.
文獻(xiàn)標(biāo)識(shí)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(chǎng)信號(hào)程控增益超低噪聲采集系統(tǒng)設(shè)計(jì)[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(guó)海洋面積廣闊,，海洋油氣資源豐富,。在海洋油氣資源探測(cè)過(guò)程中，面對(duì)愈加復(fù)雜的探測(cè)對(duì)象,，傳統(tǒng)而單一的三維地震探測(cè)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(bǔ)充手段[2]，具有高阻異常識(shí)別能力,，能夠判斷儲(chǔ)層中含油或是含水[3],，在油氣資源探測(cè)和估算中發(fā)揮著越來(lái)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(qiáng)嘉晨1，謝 鵬1
(1.中國(guó)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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