【摘要】 提出了一种以非接触的方式探测可燃、易爆物质的传感器设计方案.根据测量传感器电极间有无物质时的电容值差确定物质电介质常数,设计了用以实现这种测量的传感器的结构、尺寸以及电极分布.分析和比较了传感器特性,并用计算机软件模拟了两种不同的传感器性能.采用阻抗分析仪测得多组数据进行分析、比对.实验结果表明电容层析电容的断层扫描传感器测量液体特性分辨率和灵敏度比平面板电容整列传感器高,为今后的密闭容器液体成像后的图像重组奠定了基础.更多还原

【Abstract】 A new sensor structure based on the non-contact way to detect flammable and explosive substances is presented.The working principle of the designed sensor is to measure the change in capacitance between electrodes pair under different conditions to calculate electrical permittivity of measured material.The structure,geometry and size of the ECT sensor are discussed.The sensor performances are analysed and compared.COMSOL simulation software is used to evaluate the performance of two types of designed sensor.An impedance analyzer is used to measure the capacitance between each electrode pair.Through the analysis of the result,the resolution and sensitivity of the designed ECT sensor are better than those of Planar capacitance sensors,which provides an experimental foundation for the future research work,image reconstruction of the liquid in a sealed container.更多还原