倒U电容式船舶液柜动态液位测量技术研究

摘要

设计了一种倒U电容式船舶液柜动态液位测量技术.基于电容器电容值正比与其中的液体含量,设计了具有‘呼吸’功能的倒U电容传感器,搭建了电容信号检测和处理系统,分析了装置的性能及检测误差,实验研究了检测电容值与液位高度的关系,以及液柜摇晃对液位检测的影响.研究结果表明,倒U电容传感器的检测电容值与液位高度存在线性关系,并且,在横摇角度为20°、横摇周期为3s的模拟船舶摇晃情况下,检测电容的相对误差小于4％,可较好地实现动态液位的判定.本技术具有结构简单、灵敏度高和稳定性好等特点,有望广泛应用于实船液柜动态液位检测.%Reports a measurement technique of liquid level in the liquid tank on ship based on the inverted U type capacitor principle.According to the linear relation between the capacitance value of the capacitor and amount of liquid,design the inverted U capacitance sensor with ‘ breath’ function and build a capacitance signal detection and processing system to detect the relationship between the detection capacitance value and liquid level height,as well as to study the effect of shaking on liquid level measurement of liquid tank.In addition,the device performance and the measurement error is analyzed.The results show:There is a liner relationship between the capacitance value and liquid level height;in the rolling angle of 20°,the rolling cycle of 3s simulation of the real ship shaking,the relative error of the corresponding detection capacitance of the liquid level is less than 4％.The technology has the characteristics of simple structure,high sensitivity and good stability.It is expected to be widely used in the detection of the dynamic liquid level of the liquid tank.