Abstract
MAGNETO-OPTICAL current transformers (MOCT) based on the Faraday Effect provide numerous advantages over the conventional transformers. However the commonly used materials in MOCT are crystals that are very expensive and temperature dependence thus will cause many problems for the output signal. Cost efficient diamagnetic PbO-Bi2O3-B2O3 (PBB) glass system is fabricated in this study, for the aim of obtaining a good candidate glass with high verdet constant and good temperature resistance to replace crystals. A home-made optical bench was setup, calibrated and used for measuring the verdet constant of the fabricated glasses. Glass with composition of 50%PbO-40%Bi2O3-10%B2O3 in mol showed high Verdet constant (0.1533 min/Gauss.cm) and good value of the figure of merit (0.02635 min/Gauss), which can be considered as the ideal candidate for MOCT applications.
Highlights
MAGNETO-OPTICAL current transformers (MOCT’s) based on the Faraday Effect provide numerous advantages over the conventional transformers
Cost efficient diamagnetic PbO-Bi2O3-B2O3 (PBB) glass system is fabricated in this study, for the aim of obtaining a good candidate glass with high Verdet constant and good temperature resistance to replace crystals
Glass with composition of 50%PbO-40%Bi2O3-10%B2O3 in mol showed high Verdet constant (0.1533 min·G–1·cm–1) and good value of the figure of merit (0.02635 min·G–1), which can be considered as the ideal candidate for MOCT applications
Summary
MAGNETO-OPTICAL current transformers (MOCT’s) based on the Faraday Effect provide numerous advantages over the conventional transformers. The measurements are contactless, small volume and cost efficient. It is hopeful for MOCT can find much wider applications especially in automobile industry [1,2]. Low cost glass with good optical-magnetic properties (e.g. high Verdet constant and figure of merit etc.) is required greatly [5,6,7]. Literatures on glasses based on heavy metal oxides for the above application have been reported [1,2]. The oxide glasses with lead and bismuth oxides, due to the big mass and polarizability of ions Pb2+ and Bi3+ belong to diamagnetism glass and has good temperature resistance, smaller phonon energy and larger refraction indices [2,4] comparing to borosilicate, phosphate and silicate glasses. Based on previous study carried out by the authors [1,5], a PbO-Bi2O3-B2O3 (PBB) based glass system was chosen for this study with the aim of obtaining a good candidate for MOCT design
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