一种新型海洋电场传感器的研究与设计  

A novel sensor for marine electric field measurement:Study and design

作　　者：王志宇[1,2] 王顺[2] 方广有[2] 张群英[2] 

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院电磁辐射与探测技术重点实验室,北京100190

出　　处：《电子测量技术》2017年第1期57-61,共5页Electronic Measurement Technology

摘　　要：提出一种用于测量海洋电场信号的低噪声电场传感器,传感器包含一对钽电极和一块低噪声斩波放大器。钽电极通过将钽粉压制、烧结并经过阳极氧化制成。引入电化学阻抗谱以建立钽电极与海水两相界面的等效电路模型,建立斩波放大器的等效噪声电路并分析。测试结果表明,所设计的斩波放大器的等效输入电压噪声为0.42nV/√Hz,钽电极的自噪声为0.67nV/√Hz,传感器总体噪声为0.83nV/√Hz。所设计传感器可用于微弱海洋电场信号的测量。This paper reports an ultralow noise sensor consisting of a novel tantalum electrode and a low noise chopper amplifier for marine electric field measurement.The tantalum electrode is manufactured by sintering high purity tantalum powders into a tight body and forming the tantalum oxide dielectric layer by anodizing the body.Electrochemical impedance spectroscopy is used to electrically characterize the interface.Noise circuit of the chopper amplifier is modeled.Electrical properties such as source impedance,frequency response and noise were measured.The measurement results imply that the chopper amplifier has a noise of 0.42nV/rt（Hz）,tantalum electrode has a noise level equivalent to a perfect resistor of 27 ohms,and the sensor system has a noise of 0.83nV/rt（Hz）.The ultralow noise sensor could be used for marine electric field measurement with high precision.

关 键 词：海洋电场测量 低噪声 斩波放大器 电场传感器 

分 类 号：TN722[电子电信—电路与系统]