复介电常数的快速无损测量

复介电常数的快速无损测量 A QUICK AND NONDESTRUCTIVE METHOD FOR THE MEASUREMENT OF COMPLEX PERMITTIVITY 吴正娴 Wu Zhengxian 1 first-author 王良刚 Wang Lianggang 1 李晓蓉 Li Xiaorong 1 武汉大学空间物理与电子信息学系 武汉大学空间物理与电子信息学系 Department of Space Physics and Electronic Information, Wuhan Uniiversity Department of Space Physics and Electronic Information, Wuhan Uniiversity 阐述一种无损快速测量微波高损物质复介电常数εｒ的方法．以带法兰盘的开口矩形波导为探头，用自动测量线测出开口波导系统的复反射系数，通过变分法和多项式曲线拟合方法，由微机即时算出待测样品的复介电常数．由于在数值计算中作了一系列有效的处理，使计算量大为减少，从而使该方法更适合于实时测量．经实验验证，该方法精确而实用，具有很好的应用前景． This paper presents a quick and nondestructive method for the measurement of the complex Permittivity εr of materials having large microwave losses. A flanged open-ended rectangular wave guide is used as the probe,it is placed in close contact with the material. under test. The complex reflection coefficient of the open-ended waveguide system is measured by a automatic standing-wave detector. By means of a variational method and curve fitting, the relative Permittivity of the material （εr’-jε"） can be determined in a short time by using a computer program. Based on a set of efficient proceduce, the computer- time is reduced considerably. Therefore, the presented method here is more favourable for real-time system. Experiments show that it is a practical and accurate method. 复介电常数 无损测量方法 开口波导 复反射系数 complex Permittivity nondestructive measurement method open-ended wave guide complex reflection coefficient TN015 1994-03-01 2021-04-01 3