FARADAY CURRENT SENSING EMPLOYING CHROMATIC MODULATION

Citation
Gr. Jones et al., FARADAY CURRENT SENSING EMPLOYING CHROMATIC MODULATION, Optics communications, 145(1-6), 1998, pp. 203-212
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Optics
Journal title
ISSN journal
0030-4018
Volume
145
Issue
1-6
Year of publication
1998
Pages
203 - 212
Database
ISI
SICI code
0030-4018(1998)145:1-6<203:FCSECM>2.0.ZU;2-F
Abstract
Faraday current sensors using a variety of sensing elements have been investigated extensively for their high sensitivity as well as other a dvantages [G.L. Lewis et al., Proc. IEE Conf. on The Reliability of Tr ansmission and Distribution Equipment, 1995; Y.N. Ning et al., Optics Lett. 16 (1991); C.M.M. van den Tempel, Appl. Optics 32 (1993)]. Concu rrently chromatic modulation techniques have been investigated at the University of Liverpool for use with optical fibre sensors of differen t types [N.A. Pilling, Ph.D. Thesis, 1992; M.M. Murphy, Ph.D. Thesis, 1991] including Faraday current sensing, for overcoming difficulties w ith non-referenced intensity modulation systems. In this contribution a brief discussion of the scope of chromatically based Faraday current sensing with particular regard to electric power transmission and dis tribution industries is given. A novel sensor based upon a Faraday gla ss block in combination with a BSO crystal in the sensing element is d escribed. The sensor takes advantage of the natural gyrotropy of the B SO which conversely has been previously regarded as a disadvantage. Th e experimental results obtained indicate that this method offers a nov el approach to improving system sensitivity. The extension of the appr oach from a simple bench top demonstrator to real power systems deploy ment is also discussed. (C) 1998 Elsevier Science B.V.