Environmental immunity of time-division multiplexing optical fiber current sensor employing a modified reciprocal reflection interferometer with a passive demodulation scheme

Hermann Lin; Wuu Wen Lin; Mao-Hsiung Chen; Shih-Chu Huang

doi:10.1117/12.339107

3 February 1999 Environmental immunity of time-division multiplexing optical fiber current sensor employing a modified reciprocal reflection interferometer with a passive demodulation scheme

Hermann Lin, Wuu Wen Lin, Mao-Hsiung Chen, Shih-Chu Huang

Author Affiliations +

Proceedings Volume 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII; (1999) https://doi.org/10.1117/12.339107
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

A modified reciprocal reflection interferometer (MRRI) with passive demodulation scheme (PDS) has been proposed for the implementations of time-division multiplexing optical fiber current senor (OFCS) system. The PDS to simplify the demodulating systems of OFCS has been developed. Descriptions of theory as well as experimental verification are presented. A good linear demodulation result is obtained. The Verdet constant measured experimentally is 4.2 (mu) rad/A*turns, in good agreement with the literatural data. By using the proposed modified reciprocal reflection interferometer, an OFCS is able to become insensitive to environment perturbations. The OFCS's noises that arise from its lead fiber disturbed by vibrating perturbations can be retrained over 20dB compared with the noises of an OFCS using a conventional configuration. It is believed that this work could significantly lead an OFCS not only to the developments of a multiplexing current sensor system, but also to a long-distance remote monitoring of HV-lines because of both the geometric feasibility of fiber optic mechanism of the MRRI and the effectively demodulated circuit reduction of the PDS.

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Hermann Lin, Wuu Wen Lin, Mao-Hsiung Chen, and Shih-Chu Huang "Environmental immunity of time-division multiplexing optical fiber current sensor employing a modified reciprocal reflection interferometer with a passive demodulation scheme", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); https://doi.org/10.1117/12.339107

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KEYWORDS

Sensors

Demodulation

Lead

Birefringence

Interferometers

Environmental sensing

Optical fibers

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