scholarly journals ELECTROMAGNETIC WAVE REFLECTION AND TRANSMISSION OF ANISOTROPIC LAYERED MEDIA BY GENERALIZED PROPAGATION MATRIX METHOD

2000 ◽  
Vol 49 (9) ◽  
pp. 1702
Author(s):  
ZHENG HONG-XING GE ◽  
DE-BIAO
Keyword(s):  
Electromagnetic Wave ◽  
Matrix Method ◽  
Wave Reflection ◽  
Layered Media ◽  
Reflection And Transmission ◽  
Propagation Matrix

Terahertz Wave Characteristic of Single Walled Carbon Nanotubes Using Propagation Matrix Method

Frequenz ◽  
2015 ◽  
Vol 69 (9-10) ◽  
Author(s):  
Mao Yan Wang ◽  
Hailong Li ◽  
Meng Zhang ◽  
Yuliang Dong ◽  
Cuilin Zhong
Keyword(s):  
Carbon Nanotubes ◽  
Matrix Method ◽  
Single Walled Carbon Nanotubes ◽  
Terahertz Wave ◽  
Reflection And Transmission Coefficients ◽  
Stratified Media ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Propagation Matrix ◽  
Walled Carbon Nanotubes

AbstractThe reflection, transmission, and absorption coefficients of Terahertz wave from one dimensional stratified media containing dispersive single walled carbon nanotubes (SWCNTs) are presented with the propagation matrix method. Firstly, the propagation matrix for the whole stratified media slab is obtained by applying electromagnetic waves in each stratified media to the boundary conditions of continuous tangential fields. The reflection and transmission coefficients are got by solving the propagation matrix expressed in the matrix recursion form. Then the accuracy of the propagation matrix method is verified by comparing with numerical results of the Finite-Difference Time-Domain method in reference. The effects to reflection and transmission coefficients of stratified media containing SWCNTs caused by the working frequency, thickness of SWCNTs and silicon dioxide substrate are investigated in detail.

Detection of delamination in composites by using electromagnetic penetrating radar

2014 ◽  
Vol 5 (2) ◽  
pp. 151-156
Author(s):  
Z. Mechbal ◽  
A. Khamlichi
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Wave Reflection ◽  
Image Features ◽  
Partial Reflection ◽  
Straight Path ◽  
Reflected Signal ◽  
Short Time ◽  
Intervening Factors

Composites made from E-glass/epoxy or aramid/epoxy are frequently used in aircraft and aerospace industries. These materials are prone to suffer from the presence of delamination, which can reduce severely the performance of aircrafts and even threaten their safety. Since electric conductivity of these composites is rather small, they can propagate electromagnetic waves. Detection of delamination damage can then be monitored by using an electromagnetic penetrating radar scanner, which consists of emitting waves having the form of short time pulses that are centered on a given work frequency. While propagating, these waves undergo partial reflection when running into an obstacle or a material discontinuity. Habitually, the radar is moved at constant speed along a straight path and the reflected signal is processed as a radargram that gives the reflected energy as function of the two-way time and the antenna position.In this work, modeling of electromagnetic wave propagation in composites made from E-glass/epoxy was performed analytically. The electromagnetic wave reflection from a delamination defect was analyzed as function of key intervening factors which include the defect extent and depth, as well as the work frequency. Various simulations were performed and the obtained results have enabled to correlate the reflection pattern image features to the actual delamination defect characteristics which can provide quantification of delamination.

Single Defect in Finite one Dimensional Photonic Crystals

2012 ◽  
Vol 614-615 ◽  
pp. 1629-1632
Author(s):  
Gang Xu ◽  
Yun Sun
Keyword(s):  
Photonic Crystals ◽  
Transmission Coefficient ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Defect Mode ◽  
Transmission Peak ◽  
Reflection And Transmission ◽  
One Dimensional ◽  
Single Defect ◽  
Reflection And Transmission Coefficient

Applying transfer matrix method, we get reflection and transmission coefficient of finite one dimensional photonic crystals. At the same time, we consider the position influence of single defect. We find the frequency of defect mode is same, but the height of transmission peak is not same when single defect is in different position of crystal. The transmission peak is maximum when the defect is in center of finite one dimensional photonic crystals.

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