Journal
IEEE SENSORS JOURNAL
Volume 22, Issue 21, Pages 20499-20507Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3206949
Keywords
Current sensor; Fabry-Perot interferometer (FPI); fiber Fabry-Perot (FFP); fiber-optic current sensor (FOCS); magnetostrictive sensor; Terfenol-D
Funding
- Optoelectronics Laboratory (LOPEL) of the Pontificia Universidade Catolica do Rio de Janeiro (PUC-Rio)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brazil (CAPES) [001]
- Human Resources Program of the Brazilian Agency of Petroleum, Natural Gas, and Biofuels-PRH ANP [PRH-16.1]
- Petroleo Brasileiro S. A. (Petrobras), Brazil [2018/00295-4]
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This article presents a compact fiber-optic current sensor based on an in-fiber Fabry-Perot interferometer and a magnetostrictive transducer. The sensor exhibits high sensitivity to electric current sensing and has the potential to replace traditional current transformers.
In this article, a compact fiber-optic current sensor (FOCS) based on an in-fiber Fabry-Perot interferometer (FPI) and a magnetostrictive transducer is presented. The in-fiber FPI sensor employed in the proposed FOCS was fabricated with a 273-mu m section of a capillary fiber spliced between two pieces of a standard single-mode fiber (SMF). The in-fiber FPI sensor and a commercial fiber Bragg grating (FBG), which was used as a reference sensor for sensitivity comparison, were bonded to a small magnetostrictive actuator (Terfenol-D) and assembled in the proposed FOCS for electric currentmonitoring up to 800Arms using a commercial FBG interrogator. The in-fiber FPI sensor presented a sensitivity 84.4% higher than that of the FBG sensor. An alternative interrogation system based on an edge-filter technique with temperature compensationwas also developedandemployed for the characterizationof the proposedFOCS under the same range of electric current. Using the edge-filter interrogation system developed, the in-fiber FPI sensor presented a sensitivity 169.8% higher than that shown by the FBG sensor. The results show that the proposed FOCS using an in-fiber FPI sensor presented high sensitivity to electric current sensing and, therefore, is a potential candidate for current monitoring in complement to conventional current transformers (CTs) as well as to conventional optical CTs (OCTs).
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