By using fixing resonator length , the complex permittivity calculate formulas are induced . the test system has been designed by using terminal reflected resonant loop 利用终端反射式谐振回路原理搭建了测试系统,编写测试软件,完成对复介电常数的计算。
This paper discusses measuring complex permittivity distribution of huge dielectric materials at 3mm frequency band and method of measurement and building the system 本文针对如何在3mm波段测量大面积介质材料复介电常数的分布情况进行了研究,提出了相应的测试方法并组建了测试系统。
Absorbing properties of single layer absorbing materials are determined by complex permittivity , complex permeability , thickness , frequency and so on . the external electromagnetic ( em ) parameters of materials lie on ingredients " content and em parameters 单层吸波材料的吸波性能主要取决于材料的复介电常数、复磁导率、材料厚度及使用频率等因素，而该层的宏观电磁参数又取决于各组分的电磁参数及其含量。
Having investigated composites of ep coating ultramicro iron using atpu as surface agent , results showed that with increasing amount of atpu , density , complex permittivity ( ) and complex permeability ( ) of composites decreased , and retentivity and coercivity increased 用atpu作表面活性剂制备核壳结构复合粒子时，随着复合时atpu用量的增加，复合粒子的密度、复介电常数( )和复磁导率( )逐渐减小，剩磁与矫顽力逐渐增大。
The result indicates that the method is correct , and the test system is reliable . therefore , the test technique can be used for the rapid , credible , nondestructive , automate , huge - area measurement of material parameters of dielectric medium , and it is also extraordinary practical 因此,本文研制的用准光腔测试大面积介质材料复介电常数分布的技术可对多种介质材料的复介电常数进行快速、可靠、无损伤、自动化、大面积的分布测量,具有较强的实用性。
The main research work includes : 1 . through analyses of the correlative measurement technology and consideration of the characteristic of the measured materials , the method by quasi - optical resonator is selected ; theory of quasi - optical resonator is analyzed ; physical model is settled ; the formulas are deduced . 2 本课题的主要工作包括: 1 .通过对国内外相关测量技术的分析,根据实际情况,确定了用准光腔进行测量;分析了准光腔理论;建立了用反射法测试的理论模型;推导了用准光腔测量复介电常数的公式。
The higher temperature , the more fe ( co ) 5 decomposed in the gaseous phase . when the temperature was raised to 150 , the thermolysis entirely happened in gaseous phase and the particles of 2 - 4um formed in long chains . with long chains broken , the plural relative permittivity ( e " , e " ) drop and plural magnetic permeability ( u " , u " ) rise 恒温滴加法受温度影响显著，随着温度的升高，发生在气相中的热分解量增加； 150下fe ( co ) _ 5完全在气相中分解，产物为2 4 m的微粒形成的链状结构，这种链状结构的破坏有利于复介电常数( 、 )的降低、复磁导率( 、 )的提高。
Then in this article resonance method is adopted . the paper analyzes the usual measurement methods of complex permittivity , then analyzes and chooses te0np circular cavity based on the methods of the te01n high - q circular cavity , uses the mode purifying and cavity dimension optimizing techniques . the resonant frequencies of varies modes in the resonant cavity have been drawn by using matlab software , which makes our work more rapid and convenient 本文首先分析了复介电常数的常用测试方法,然后分析并选用了基于高q腔法原理的te0np圆柱腔,应用模式净化和腔体优化技术,利用matlab这一运算性能强大的工具软件编程,作出谐振腔中各个模式的频率分布图,使系统的设计工作清晰、便捷。
A coherent electromagnetic pulse in the range between the far - infrared and microwave region is used as a detection source . the amplitude of the wave is recorded by electro - optical or photoconductive sampling . after fast fourier transform , the amplitude and phase of the wave is given , then the complex refractive index standing for the absorption and dispersion of the material in thz region is extracted Thz ( 10 ~ ( 12 ) hz )时域光谱技术是20世纪90年代发展起来的一种新型的光谱测量技术，它使用频率介于远红外和微波之间的相干电磁辐射脉冲作为探测源，利用电光取样或光电导取样的方法直接记录thz辐射电场的振幅时间波形，通过傅立叶变换得到测量信号振幅和相位的光谱分布，进而获得材料在thz波段的复介电常数，即色散及吸收等信息。
