Sensitive linear electric current measurement using twometal-coated single-mode optical fibers
Ching-Tarng Shyu
Likarn Wang
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu;
This paper appears in: Lightwave Technology, Journal of
Publication Date: Nov 1994
Volume: 12,
Issue: 11
On page(s): 2040-2048
ISSN: 0733-8724
References Cited: 27
CODEN: JLTEDG
INSPEC Accession Number: 4842197
Digital Object Identifier: 10.1109/50.336070
Current Version Published: 2002-08-06
Abstract
A new fiber-optic sensing technique for electric current
measurement is proposed in this paper. The technique is based on the use
of the sensitive thermal detection in which two metal-coated single-mode
fibers in an interferometer of Mach-Zehnder type are used. In the
proposed method, a constant bias current with enough accuracy is
employed to amplify the detected phase variation caused by the current
to be measured. The experimental results prove that not only can the
sensitivity of measurement be well enhanced, but also that a wide
dynamic range and good linearity can be obtained using the proposed
method. In the case of coating resistances of 60.6 and 60.56 Ω,
the measurement sensitivity can be enhanced by more than 20 times if a
bias current of 50 mA is used for measuring 4-mA dc current, compared to
the traditional method in which only one fiber arm of the interferometer
is coated with metal. In the linear measurement of electric current
ranging from ~0.01 to ~10 mA the current-to-phase sensitivity is found
to equal 1.13×104 rad/amp
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