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发展了一种能够测量含湿多孔介质局部含湿量的针型电容法。通过采用针型电容传感器和能够精确测量微小电容变化的测量电路,采取减少介质损耗的有效措施,使测量的灵敏度、稳定性和空间分辨率均达到了较高的程度。实验结果表明,针型电容法灵敏度高、线性度好,可为含湿多孔介质局部含湿量的测量提供一种测试手段。
A pin capacitor method has been developed to measure the local moisture content of porous media containing moisture. Through the use of pin capacitive sensors and measurement circuits that accurately measure small changes in capacitance, effective measures to reduce dielectric loss are used to achieve high levels of sensitivity, stability and spatial resolution. The experimental results show that the needle capacitance method has high sensitivity and good linearity, which can provide a test method for the measurement of the local moisture content of porous media containing moisture.