摘要
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 needle-type capacitance method is developed for measuring local moisture contents in wet porous media. By using a needle-type capacitance sensor,a circuit for accurately determining the mini-capaci-tance changes and effective techniques for reducing toss tangent,the high sensitivity,stability and spatial resolving power for the method are reached. The experimental results show that such a sensor and the method could be an effective tool for study of heat and mass transfer in wet porous media.
出处
《计量学报》
CSCD
1996年第3期178-180,202,共4页
Acta Metrologica Sinica
基金
国家自然科学基金
关键词
含湿量
电容传感器
多孔介质
测量
Moisture contents
Capacitance sensor
Porous media
