開端同軸線的電磁場研究及其在無損檢測中的應(yīng)用
THE EM RESEARCH OF AN OPEN-ENDED COAXIAL LINE AND ITS APPLICATION TO NONDESTRUCTIVE MEASUREMENT OF MATERIALS
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摘要: 通過測量開端同軸線的反射,以確定物質(zhì)的介電常數(shù),是一種簡捷的無損檢測方法。本文從嚴(yán)格的場匹配方法出發(fā),研究同軸線開端處的電磁場。利用矩量法進行數(shù)值計算,求出反射系數(shù)與介電常數(shù)的數(shù)值對應(yīng)關(guān)系。所得結(jié)果與有關(guān)文獻的比較分析證實了理論推導(dǎo)的可靠性。最后,本文為實際測量提供了一種數(shù)值反演方法。
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關(guān)鍵詞:
- 電磁場; 開端同軸線; 并矢格林函數(shù); 矩量法
Abstract: The measurement of reflection from an open-ended coaxial line is a simple and nondestructive technique of determining the dielectric property of materials. The electromagnetic field in the vicinity of the aperture is studied by means of rigorous field matching method. The reflection coefficient is computed by moment method as a function of the dielectric constant. The validity of the theoretical results is ested by comparing the numerical evaluation with previous paper. Furthermore, a method fo data inversion is provided. -
M. C. Decreton et al., Trans on IM, IM-23(1974)4, 434-438.[2]K. S. Nikita et al.,IEEE Trans on MTT, MTT-37(1989)11, 1794-1800.[3]M. Gex-Fabry et al., Arch. ELek. Uberzsagung., 33(1979)5, 473-478.[4]F. E. Gardiol et al..[J].The Reflection of an Open Ended Circular Waveguide-Application to Nondestructive Measurenent of Materials, in Review of Infrared and Millimeter Waves, ed. K. J. Btatton, Vol.1,New York: Plenum.1983,:-[5]N. Marcuvitz, Waveguide Handbook, Naw York: McGraw-Hill, (1951), pp. 280-372.[6]E. Tanabe et al., IEEE Trans. on IM, IM-25(1976)3, 222-226.[7]J. R. Mosig et al., IEEE Tsans. on IM, IM-30(1981)1, 46-51.[8]宋文森,電子科學(xué)學(xué)刊,11(1989)2, 164-175.[9],劉宏, 開端波導(dǎo)的電磁場研究及其在無損檢測中的應(yīng)用,中國科學(xué)院電子學(xué)研究所碩士學(xué)位論文,北京,1991年6月. -
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