Li_Kong_Jones_Spencer_1997_IEEE.pdf (167.19 kB)
Download fileSensitivity improvement of an optical current sensor with enhanced Faraday rotation
journal contribution
posted on 2009-08-26, 10:31 authored by Gongde Li, Michael G. Kong, Gordon R. Jones, Joe W. SpencerA sensitivity improvement technique is proposed
for a class of bulk-glass optical current sensors that employ a
ferromagnetic field concentrator. The total effective optical path
length is demonstrated theoretically to be an invariant regardless
of the bulk glass thickness and consequently independent of the
size of the concentrator gap opening. Thus, if the magnetic field is
increased by reducing the gap size, the eventual Faraday rotation
for a given electric current can be increased proportionally,
leading to an improved device sensitivity. The dependence of the
gap magnetic field on gap size is calculated with an equivalent
circuit model, and this analytical treatment is compared with a
dedicated finite element computer package. By taking account of
various types of optical power losses present in the bulk glass,
the above formulated gap dependence of magnetic field is used to
aid a realistic assessment of device sensitivity and this serves as
a tool to design and analyze practical bulk-glass optical current
sensors. A detailed experimental study to confirm the proposed
sensitivity improvement technique is also reported.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Citation
LI, G.D. ... et al, 1997. Sensitivity improvement of an optical current sensor with enhanced Faraday rotation. IEEE Journal of Lightwave Technology, 15 (12), pp. 2246-2252.Publisher
© IEEEVersion
- VoR (Version of Record)
Publication date
1997Notes
This article was published in the journal, IEEE Journal of Lightwave Technology [© 1997 IEEE] and is also available at: http://ieeexplore.ieee.org/ Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.ISSN
0733-8724Language
- en