OE Letters

Fiber-optic current sensor

[+] Author Affiliations
Wuu-Wen Lin

Yung Ta Institute of Technology & Commerce, 316 Chung-Shan Road, Lin-Lo Ping Tung?90902, Taiwan

Opt. Eng. 42(4), 896-897 (Apr 01, 2003). doi:10.1117/1.1559056
History: Received Oct. 17, 2002; Revised Nov. 21, 2002; Accepted Dec. 30, 2002; Online April 01, 2003
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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 1.6443×1025rad/Hz.1/2 The minimum DC current detected is 3.423×1027A. The dynamical range is 89 dB with ±60.5-dB linearity. The minimum detectable AC current is 4.193×1027A with a dynamic range around 75 dB. The linearity is within ±61 dB for AC current. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

Wuu-Wen Lin
"Fiber-optic current sensor", Opt. Eng. 42(4), 896-897 (Apr 01, 2003). ; http://dx.doi.org/10.1117/1.1559056


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