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Optical Engineering

Fiber-optic current sensor
Author(s): Wuu Wen Lin
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Paper Abstract

When a current passes through a metal-coated optical fiber, the Ohm's heat induces a phase change of the guided light within the fiber. This microampere current sensor is principally designed based on this thermal effect. A Michelson interferometer is used for detecting this phase change. By means of our sensor, the minimum detectable phase signal is 1.6443×1025 rad/Hz.1/2 The minimum DC current detected is 3.423×1027 A. The dynamical range is 89 dB with ∓60.5-dB linearity. The minimum detectable AC current is 4.193×1027 A with a dynamic range around 75 dB. The linearity is within ∓61 dB for AC current.

Paper Details

Date Published: 1 April 2003
PDF: 2 pages
Opt. Eng. 42(4) doi: 10.1117/1.1559056
Published in: Optical Engineering Volume 42, Issue 4
Show Author Affiliations
Wuu Wen Lin, Yung Ta Institute of Technology & Commerce (Taiwan)

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