scholarly journals MEASUREMENT METHOD OF THE REFLECTION COEFFICIENT IN THE DIAGONAL ELECTROMAGNETIC WAVE BY THE PARALLEL WIRE LINE

2004 ◽  
Vol 69 (584) ◽  
pp. 9-13 ◽  
Author(s):  
Shinji KAWABE ◽  
Tetsuo IKEDA ◽  
Dapeng WANG
Keyword(s):  
Electromagnetic Wave ◽  
Reflection Coefficient ◽  
Measurement Method ◽  
Parallel Wire

Radar Absorbing Materials Based on Metamaterials

2010 ◽  
Vol 75 ◽  
pp. 215-223
Author(s):  
Andrey Nikolayevich Lagarkov ◽  
Vladimir Nikolayevich Kisel ◽  
Vladimir Nikolayevich Semenenko
Keyword(s):  
Electromagnetic Wave ◽  
Reflection Coefficient ◽  
Frequency Band ◽  
Radar Absorbing Material ◽  
Wide Range ◽  
Absorbing Materials ◽  
Different Types ◽  
Absorbing Material ◽  
Wave Incidence

The use of metamaterial for design of radar absorbing material (RAM) is discussed. The typical features of the frequency dependencies of , , ,  of composites manufactured of different types of resonant inclusions are given as an example. The RAM characteristics obtained by the use of the composites are given. It is shown that it is possible to use for RAM design the metamaterials with both the positive values of ,  and negative ones. Making use of the frequency band with negative  and  it is possible to create a RAM with low reflection coefficient in a wide range of the angles of electromagnetic wave incidence.

An ultrasonic measurement method for full range of oil film thickness

2018 ◽  
Vol 233 (3) ◽  
pp. 481-489 ◽  
Author(s):  
Kai Zhang ◽  
Pan Dou ◽  
Tonghai Wu ◽  
Kai Feng ◽  
Youquan Zhu
Keyword(s):  
Reflection Coefficient ◽  
Film Thickness ◽  
Measurement Method ◽  
Ultrasonic Method ◽  
Dead Zone ◽  
Full Range ◽  
Thickness Measurement ◽  
Ultrasonic Measurement ◽  
Center Frequency ◽  
Oil Film

Ultrasonic method is quite promising for oil film thickness measurement in industry, while there is normally a dead zone for one ultrasonic sensor with a special center frequency when measuring the oil film thickness by the traditional reflection coefficient amplitude. In this paper, an ultrasonic measurement method for full range of oil film thickness was investigated. The theoretical relationship between the oil film thickness and the reflection coefficient phase was firstly built up and the reflection coefficient phase was found to be able to measure the oil film thickness in the dead zone. Then the reflection coefficient amplitude and phase were combined to measure the oil film thickness in the full range. A high-precision calibrated rig, which could form a series of known film thicknesses oil layers, was set up and the performance of this method was shown to work well. This method is significant for online oil film thickness monitoring in industry.

scholarly journals Model of Е-polarized wave propagation in a multilayer dielectric structure

2021 ◽  
Vol 2021 (3) ◽  
pp. 111-118
Author(s):  
P.I. Zabolotnyi ◽  
Keyword(s):  
Dielectric Constant ◽  
Electromagnetic Wave ◽  
Reflection Coefficient ◽  
Incidence Angle ◽  
Relative Dielectric Constant ◽  
Normal Incidence ◽  
Dielectric Constants ◽  
Dielectric Structure ◽  
Range Of Variation ◽  
Multilayer Dielectric

This paper addresses the determination of the dielectric constant of multilayer dielectric structures by radiowave interferometry. In the general case, in interferometry measurements to one measured value of the reflection coefficient there may correspond an infinity of dielectric constants. This ambiguity may be resolved by first determining the effect of different parameters of the probing electromagnetic wave on the reflection coefficient. In particular, it is important to have a preliminary estimate of the effect of the incidence angle and the polarization on the range of variation of the reflection coefficient with the variation of one of the structure parameters. This paper considers the case where a plane E-polarized electromagnetic wave, i.e. a wave whose magnetic field is perpendicular to the incidence plane, is incident on a multilayer dielectric structure. The aim of this work is to develop a model of the propagation of an E-polarized electromagnetic wave through a multilayer dielectric structure at an arbitrary incidence angle and to determine the range of variation of the reflection coefficient with the variation of the dielectric constants of the layers. The paper presents a model of the propagation of an E-polarized electromagnetic wave in a two-layer dielectric structure. A metal base, which is an ideal conductor, underlies the structure. The electromagnetic wave is incident from the air at an arbitrary incidence angle. Based on the model, a method is proposed for measuring the relative dielectric constant and the dielectric loss tangent. It is shown that at a normal incidence the reflection coefficient magnitude is the same both for H- and E-polarization. Because of this, determining the relative dielectric constant and the loss tangent from the measured reflection coefficient magnitude calls for measurements not only at a normal incidence, but also at an oblique incidence, at which the reflection coefficient magnitudes will be different for H- and E-polarization.

scholarly journals Multifunctional method for remote monitoring of the environment in the area of nuclear facilities

2019 ◽  
Vol 140 ◽  
pp. 07006 ◽  
Author(s):  
Vadim Davydov ◽  
Varvara Fadeenko ◽  
Illarion Fadeenko ◽  
Vladislav Reznik ◽  
Vladislav Kruglov ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Reflection Coefficient ◽  
Environmental Monitoring ◽  
Remote Monitoring ◽  
Nuclear Power ◽  
Climatic Conditions ◽  
Nuclear Facilities ◽  
Radiation Characteristics

In a paper the method for remote monitoring of the radiation characteristics of the environment in the area of the nuclear power plant is considered. To solve this problem, the need to use remote methods of environmental monitoring is justified A method is proposed for determining radioactive formations in the atmosphere using a radar station. Using the methodology for determining radioactive formations in the atmosphere by changing the reflection coefficient of an electromagnetic wave from a given formation is justified. Calculation of changes in the reflection coefficient of an electromagnetic wave from a radioactive formation in the atmosphere for different climatic conditions is calculated. The results of studies of radioactive contamination in the atmosphere are presented. The advantages of the method developed by us in comparison with others are noted. The directions of scientific research to expand the functionality of the method developed by us are determined.

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