Моделирование чувствительного элемента на планарном грибовидном метаматериале для неразрушающего контроля и поиска неоднородностей в технологических средах
A computer model and the results of a numerical experiment for a sensitive element on a planar mushroom-shaped metamaterial with cells of the "Maltese cross" type are presented. The proposed electrodynamic structure is shown to be applicable for non-destructive testing of geometric and electrophysical parameters of technological media, as well as searching for inhomogeneities in them. Resonant frequency shift and change of the attenuation coefficient value of the structure serve as informative parameters.
A novel sensitive element, formed by cross-wound helices, is investigated and described in this paper. Based on outstanding properties of the coupled slow-wave structures, such as splitting electric and magnetic fields and the multiple increase in the slowdown, this sensitive element combines advantages of the elements with distributed parameters and the relatively low operating frequencies. Concentrating the electromagnetic field in a measurement volume, caused by slowing of the wave, and splitting electric and magnetic fields lead to a significant increase in sensitivity. The main properties and some characteristics of the cross-wound helices are analyzed, calculated, and measured. The practical realization of the described sensitive element is demonstrated on the example of a linear displacement sensor, patented and placed on the market.
Software-hardware IR thermography subsystem for non-destructive testing of electronic components overheating has been developed. IR measuring part included: Flir ThermoVision A40 infrared camera with 17 mkm macro lens, Quantum Focus Instruments Corp InfraScope, precise positioning system. Software part for IR data processing included two standard tools: ThermaCAM Researcher, NEC San-ei Image Processor and several original software tools for extension of the subsystem abilities. The sets of examples are presented to illustrate the efficiency of using IR thermography measuring subsystem for non-destructive testing of electronic components (semiconductor devices, chips, PCBs) to improve thermal stability and reliability of electronic products.
We present the sensor with a sensitive element (SE) based on coupled radial spirals, which can be used for monitoring technological processes in the Electronic Industry, as well as for detecting damages on the pipelines under protective coatings. The main properties and characteristics of such SE are analyzed and measured. It is shown that the concentration of the electromagnetic field in a measuring space, caused by slowing down of the the wave, and splitting of the electric and magnetic fields leads to a significant increase in sensitivity, whereas the multiple increases in the slowdown makes it possible to use the advantages of SE with distributed parameters at relatively low operating frequencies. The practical realization of the described sensor is demonstrated in measuring the ion implantation processes and the thickness of the metallization, as well as in monitoring the invisible cracks and damages through the protective coats on the metal surfaces.
This article describes creation of a commutation device - one of the key elements fo universal diagnostic system for technical control and diagnosis of electronic means in the stages of final inspection and maintenance.
One of the promising areas of microwave resonator systems application is the possibility of their use as frequency-selective structures for the control of physical quantities and monitoring of process parameters. It is possible to determine parameters of planar dielectric materials – dielectric permittivity and dielectric loss tangent by measuring electrodynamic characteristics of a cylinder resonator with H011 mode. Here we present the results of analytical assessment, computer modeling in Ansoft HFSS v.12 and experimental data. The measurement error in determining the dielectric parameters of the material does not exceed a fraction of a percent of the table values.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
The conference “2021 Systems of signals generating and processing in the field of on board communications” is organized with technical sponsorship of Russian (Moscow) IEEE Circuits and Systems (CAS04) Chapter IEEE Region 8, Russian Section Chapter, MTT/ED and Institute of Radio and Information Systems Association (IRIS), Vienna, Austria. The conference featured invited researchers, educators, managers, and graduate students, whose research activity, case studies or best practices, are shedding light on the theory or practice of engineering, include modern digital transportation systems design and technical operation, radio waves propagation, transmitting, receiving and processing signals in television and radio broadcasting devices, information technologies in transport. The main areas of the conference “Systems of signals generating and processing in the field of on board communications” include modern digital transportation systems design and technical operation, radio waves propagation, transmitting, receiving and processing signals in television and radio broadcasting devices, information technologies in transport. FIELD OF INTEREST: Components, Circuits, Devices and Systems; General Topics for Engineers; Signal Processing and Analysis. Reports presented at the conference are grouped in 6 sections: 1. Antennas and Radio Waves Propagation. 2. Navigation and Mathematical Algorithms of an Object Space Orientation. 3. Radiofrequency Applications. 4. Wire and Optical Communication and Control Systems. 5. Intelligent Transport Systems (ITS): Sub-section 1: Use of digital ITS infrastructure in telematic control systems on urban passenger transport Sub-section 2: Peculiarities of data exchange in cooperative ITS Sub-section 3: Theoretical Aspects of Artificial Intelligence Systems Development for Transportation Engineering Sub-section 4: Test methods of motor vehicles integrated into an intelligent transport environment 6. Digital signal processing in on-board radio systems
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.