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1
Content available Determination of electrical and thermal parameters of vertical-cavity surface-emitting lasers
Śpiewak Patrycja, Gębski Marcin, Strupiński Włodek, Czyszanowski Tomasz, Kołkowski Walery, Pasternak Iwona, Sarzała Robert P., Nakwaski Włodzimierz, Wasiak Michał
Metrology and Measurement Systems
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2023
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Vol. 30, nr 3
519--529
EN
Experimental methods are presented for determining the thermal resistance of vertical-cavity surface-emitting lasers (VCSELs) and the lateral electrical conductivity of their p-type semiconductor layers. A VCSEL structure was manufactured from III-As compounds on a gallium arsenide substrate. Conductivity was determined using transmission line measurement (TLM). Electrical and thermal parameters were determined for various ambient temperatures. The results could be used for computer analysis of VCSELs.
2
Content available remote Simulation of Electromagnetic Disturbances in Uninterruptible Power Supplies Using Hybrid Numerical Methods
Bahadorzadeh M., Neyestanak L., Branch S. R.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 7b
189-191
EN
In this paper the Electromagnetic disturbances and susceptibility of metallic enclosures which are used in shielding of high voltage industrial power supplies have been studies. Basic parameters in shielding design for uninterruptible power supplies which is important in EMC considerations, have been investigated. The aperture size and position and the distance between two shielded power supplies and their effects on electromagnetic parameters such as electric field intensity, shielding effectiveness, return loss, and resonant modes have been studied. This study is performed by using a new hybrid simulation method that utilizes TLM modelling in near field and Method of Moment in far field.
PL
W artykule przeanalizowano zakłócenia elektromagnetyczne, podatność metalowej obudowy oraz parametry ekranowania źródeł zasilania bezprzerwowego na podstawie nowej metody hybrydowej z zastosowaniem metod TLM w strefie bliskiej oraz MoM dla pola dalekiego.
3
Content available TLM-method for computer modeling of transformers’ windings frequency response
Banaszak S., Gawrylczyk K. M.
Poznan University of Technology Academic Journals. Electrical Engineering
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2012
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No. 69
41--47
EN
The diagnostics of power transformers is a very fast developing branch, due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. For the aim of windings impedance modeling the transmission-line models are applied. The idea of TLM was presented in [1], While the length of transformer wires is comparable to wave length at high frequency, such approach is reasonable. The paper presents examples of models created for simple windings.
4
Content available TLM-method for Computer Modeling of Transformers’ Windings Frequency Response
Banaszak S., Gawrylczyk K. M.
Computer Applications in Electrical Engineering
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2012
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Vol. 10
137--145
EN
The diagnostics of power transformers is a very fast developing branch, due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. For the aim of windings impedance modeling the transmission-line models are applied. The idea of TLM was presented in [1]. While the length of transformer wires is comparable to wave length at high frequency, such approach is reasonable. The paper presents examples of models created for simple windings.
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