Temperature characteristics of a new magneto-optical current transformer

Issue title: Proceedings of the tenth International Symposium on Applied Electromagnetics and Mechanics ISEM-Tokyo

Article type: Research Article

Authors: Didosyan, Yuri S.^a | Hauser, Hans^{a; *} | Toriser, Walter^a

Affiliations: [a] Institute of Industrial Electronics and Material Science, Vienna University of Technology, Gusshausstrasse 25-29/366, A-1040 Vienna, Austria

Correspondence: [*] Corresponding author: Tel.: +43 1 58801 36614; Fax: +43 1 58801 36695; E-mail: [email protected]

Abstract: In contrast to existing current transformers utilizing the Faraday rotation of light polarization, the principle of operation of the new sensor is based on the direct registration of the domain wall positions in an orthoferrite, a transparent ferromagnet. The results of the measurements are not affected directly by temperature changes of Faraday rotation, birefringence, fluctuations of the incident light beam, polarization distortions in fibers, etc. The amplitude of domain wall motion remains constant in a wide range of driving magnetic field frequencies from dc to hundreds kHz. With the further growth of the frequency the amplitude decreases in two times at 5~MHz. In the temperature range from 20°C to 130°C the domain wall mobility and the bandwidth decrease in about three times.

DOI: 10.3233/JAE-2002-334

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 13, no. 1-4, pp. 277-283, 2002