Mohamad Arnaout

Analysis of Charge Transport and Ionization Effect in Space-Used Polymers Under High-Energy Electron Irradiation

Polymer materials have been tested in the dedicated experimental facility SIRENE (ONERA, Toulouse, France) designed to reproduce the electron energy spectrum met in space in the (0–400 keV) energy range and to perform electric analysis on the materials through dedicated protocols with potential, current, and contactless pulsed-electro acoustic (CNES patent) measurements. A Novel experimental approach shall as well be presented, which allowed bringing into evidence the complex response of polymers under irradiation: polarization and charge differential mobility as well as physical structural changes have been analyzed with these new techniques allowing a better understanding and prediction of charging behavior and radiation-induced conductivity evolution of these polymers under space conditions.

An educational electric power simulator

Electric power system is a network of electrical components used to supply, transmit and use electric power. Due to the complexity and non-linearity of the power system, hand calculations may be very complicated in some cases, especially when the number of buses or inputs is very large. The aim of this paper is developing an electric power system software that focuses on three main concepts in power system analysis: fault calculation, power flow calculation, and economic dispatch calculation using GUI/MATLAB. This tool is considered as an educational interface that could be used by EE students helping them in analyzing the principles of a given power system.

Iterative Deconvolution of PEA Measurements for Enhancing the Spatial Resolution of Charge Profile in Space Polymers

This work aims to improve the PEA calibration technique through defining a well-conditioned transfer matrix. To this end, a numerical electroacoustic model that allows determining the output voltage of the piezoelectric sensor and the acoustic pressure is developed with the software COMSOL®. The proposed method recovers the charge distribution within the sample using an iterative deconvolution method that uses the transfer matrix obtained with the new calibration technique. The obtained results on theoretical and experimental signals show an improvement in the spatial resolution compared with the standard method usually used.

Analysis of Charging Kinetics on Space Dielectrics Under Representative Worst Case Geostationary Conditions

Prediction of the surface charging behavior of the materials used in space often raises concerns about the definition of the applied electron energy spectrum used for irradiation during testing. Radiation-induced conductivity (RIC) cannot be discarded for a proper qualification of these materials. But RIC level is significantly dependent upon radiation dose and dose rate. We have demonstrated that for some energy spectra, severe potentially hazardous charging levels were predicted by models when radiation history was ignored. However, the charging effect is strongly smoothed by the radiation history of the material. We have been able therefore to reveal in this paper that a good electric qualification of space materials under electron irradiation requires the definition of realistic electron energy spectrum and implies to take into account radiation history in space.

Modeling and simulating a PWP cell for the electric characterization of space dielectric materials

The aim of this paper is to simulate the pressure wave propagation method (PWP) for studying the charge profile of irradiated insulators. This can be achieved through developing a specialized model for this method using COMSOL-multiphysics. COMSOL solves the system of partial differential equations using the finite element method in non-stationary conditions where we will focus on a one-dimensional system.

My PV tool: A Matlab-based tool to study the series and shunt resistances in photovoltaic modules

A tool, “MY PV TOOL”, has been developed in this work to study the behavior of series and shunt resistances in PV modules. Experimental as well as theoretical equations have been used to determine the series and shunt resistances for a given commercial PV module.

Parameter estimation of scattering components using matrix pencil based support vector regression

Time delay estimation is a fundamental signal-processing problem encountered in numerous applications. The backscattered signals emanating from a source and arriving at a receiver are usually represented by a model called the undamped exponential model. This model is used for narrowband signals whose time delays are usually estimated using super-resolution algorithms. For wideband signals, however, a geometric-theory-of-diffraction (GTD) based model is usually used to incorporate the frequency dependency of individual backscattered signals. In the literature, this model is approximated to allow for the application of existing super-resolution algorithms at the expense of estimation accuracy. This paper proposes a new model-independent estimation method called Matrix Pencil Based Support Vector Regression to overcome the limitations of existing methods. Simulation results show that the proposed algorithm succeeds in accurately estimating the time delays and frequency dependency parameters of the GTD-based model.