FIBER SENSORS

Fiber optic microampere dc current sensor

[+] Author Affiliations
Wuu-Wen Lin

Yung Ta Institute of Technology, Pin Tung, Taiwan 90902

Shih-Chu Huang

Chung-Shan Institute of Science and Technology Tso-Ying, Kaohsiung, Taiwan 813

Mao-Hsiung Chen

National Sun Yat-sen University Kaohsiung, Taiwan 804

Opt. Eng. 42(9), 2551-2557 (Sep 01, 2003). doi:10.1117/1.1597675
History: Received Oct. 29, 2002; Revised Dec. 31, 2002; Revised Feb. 25, 2003; Accepted Mar. 3, 2003; Online August 22, 2003
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A microampere dc current is measured by a fiber optic sensor. The phase change of the guided light induced by ohm’s heat over a golden-coated fiber is detected by an interferometer. The thermal conduction of the optical fiber and the relation of the temperature-induced phase change of the guided light are explored. A Michelson interferometer plus a Faraday rotator mirror enable system immunity from the polarization-induced signal fading due to the environmental disturbance, especially by vibration and temperature. A passive phase-generated carrier (PGC) demodulation scheme enables the system to demodulate the interference signal stably by shifting the signal away from the high-noise, low-frequency band through a carrier. The sensitivity of the sensing system is improved by a biased method. The minimum measurable dc current is 3.416×107A with a dynamic range of 89.33 dB. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

Wuu-Wen Lin ; Shih-Chu Huang and Mao-Hsiung Chen
"Fiber optic microampere dc current sensor", Opt. Eng. 42(9), 2551-2557 (Sep 01, 2003). ; http://dx.doi.org/10.1117/1.1597675


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