Browsing by Author "Dodampola, R"

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item: Conference-Abstract
Identifying better fitting function for asymmetric differential thermo gravimetric signal analysis
Dodampola, R; Egodage, D; Amarasinghe, S; Attygalle, D; Weragoda, S; Perera, T
Thermogravimetric analysis is one of the main technique used in solid state reaction kinetics studies. Unlike in gaseous and liquids state reactions, most solid-state reaction mechanisms are complex and comprise of simultaneous reactions. Curve fitting is one of the most used tool to obtain kinetic parameters such as activation energy and preexponential factor despite the reaction mechanism. Diferential Thermo Gravimetric (DTG) signals are asymmetric and its asymmetry depends on the kinetic triplet. Therefore, the use of symmetric functions such as Gaussian and Lorentzian to fit asymmetric DTG signals infer errors. To avoid that a new curve fitting method has been introduced in this study.
item: Conference-Full-text
Investigation of 3d refractive index contrast variations in pvg based photo printed passive optical integrated circuit components.
(IEEE, 2018-05) Amarasinghe, DAS; Attygalle, D; Weragoda, S; Dodampola, R; Dehipawala, S; Chathuranga, D
Integrated photonics will play an important role in future technologies and the advancement of optical integrated circuits (OICs) is unquestionably dependent on the ability to develop compact and reliable optical components at low cost. Here the authors investigate, the technological viability of a novel technology that has the potential to fabricate functional optical components and integrated them into miniaturized circuits. Three-dimensional refractive index patterns printed on porous vycor glass can be stabilized through consolidation of the glass matrix. The refractive index difference between low and high index regions or the refractive index contrast, is a key decider of the efficiency of those functional optical components. This paper discusses the 3D index contrast variations of photo-lithographically constructed volume Bragg gratings and their index contrast variation at the low and high index interface region. The study also examines the effect of matrix consolidation on the index pattern resolution.
item: Conference-Full-text
Investigation of plasticizer evaporation of local electrical cable insulations
(IEEE, 2018-05) Egodage, D; Dodampola, R; Weragoda, S; Amarasinghe, DAS; Attygalle, D; Chathuranga, D
Though insulation is critical to the performance of an electrical cable the assessment of the status of an insulation is still a major challenge. Since the root cause of most electrical cable failures is due to insulation deterioration, if the rate of aging can be predicted, properly scheduled, appropriate maintenance programs can nearly eliminate cable failures. The kinetics of plasticizer evaporation of polyvinyl chloride based locally manufactured electrical cable insulations were investigated. Plasticizer evaporation is a slow process under low temperatures and would take years to study under such conditions. Therefore, accelerated conditions were used to get readings within the limited timeframe. Nevertheless, data obtained under accelerated conditions was mapped to normal conditions through Arrhenius approach. Deconvoluted derivative thermograms were used to identify the initial plasticizer percentages and Arrhenius approach was used to map accelerated condition measurements to ambient temperature evaporation rates.
item: Conference-Full-text
Study on thermal endurance of plasticizer in locally manufactured electrical cable insulation
(IEEE, 2022-07) Egodage, DP; Dodampola, R; Ratnakumar, A; Weragoda, SC; Amarasinghe, DAS; Samarasekara, AMPB; Attygalle, D; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
Electrical cables are collections of one or more electrical conductors, which are separately insulated and covered together using a sheathing material. Since air does not perform well as a good insulation material, an insulation material is also introduced to resist the passing of electrical current in the radial direction. This will prevent electrical leakage and protect the stability of wire material by concealing it from environmental attacks such as heat and humidity. This paper analyzes the kinetics of the thermal endurance of plasticizers present in locally available electrical cable insulations. For this purpose, a model was developed to map higher temperature accelerated plasticizer evaporation kinetics to lower temperature practically experiencing values. Plasticizer evaporation data were collected in the range of 80-160 °C. Since the plasticizer evaporation reaction occurs over the considered temperature range, notable physical transitions (e.g., crystallization or glass transition) were not observed within the mentioned temperature range. Therefore, The Arrhenius-principle-based approach was employed to map accelerated condition measurements to ambient condition evaporation. An Experimentally determined evaporation behavior was used to define the evaporation kinetics of plasticizers. It was observed that the rate constant of plasticizer evaporation increases with the increasing temperature.