通过对电容式原油含水率传感器的设计与分析、传感器信号驱动和调理电路的开发、含水率误差补偿及数据处理算法的研究，试制了一种新型全量程含水率测试仪。它的创新点是：利用有限元分析方法建立传感器电磁场仿真模型，对传感器电场和磁场参数进行分析，改变传感器尺寸和结构，实现性能优化；建立电容传感电路噪声传递模型，对各类噪声源进行分析，并采用误差抑制技术，提高电路信噪比，优化电路性能；研究原油含水率数据高精度标定算法，并针对现场监测需求，将标定算法内嵌入单片机系统，实现远端实时标定。 Through the design and analysis of capacitive crude oil water content sensor, the development of sensor signal drive and conditioning circuit, water content error compensation and data processing algorithm research, a new full range water content tester was trial-produced. Its innovative points are: using the finite element analysis method to establish a sensor electromagnetic field simulation model, analyze the sensor’s electric and magnetic field parameters, change the sensor’s size and structure and achieve performance optimization; establish a noise transfer model of capacitor sensing circuit, analyze various noise sources, and adopt error suppression techniques to improve the signal-to-noise ratio of the circuit and optimize the circuit performance; study the high-precision calibration algorithm of crude oil water content data, and embed the calibration algorithm into the single-chip system to achieve remote real-time calibration according to the needs of on-site monitoring.