Optical Magnetostrictive Current Sensor Based on In-Fiber Fabry-Pérot Cavity

In this paper, a compact fiber-optic current sensor (FOCS) based on in-fiber Fabry-Perot interferometer (FPI) and magnetostrictive transducer is presented. The in-fiber FPI sensor employed in the proposed FOCS was fabricated with a 273-μm section of capillary fiber spliced between two pieces of stan...

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Bibliographic Details
Published in:IEEE sensors journal 2022-11, Vol.22 (21), p.1-1
Main Authors: Soares, Larissa M. B., Vargas, Juan D. L., Allil, Regina C. S. B., Dante, Alex, Werneck, Marcelo M.
Format: Article
Language:English
Subjects:
Actuators
Bragg gratings
Current sensor
Electric currents
Fabry-Perot interferometers
Fabry-Pérot interferometer
fiber Fabry-Pérot
Fiber gratings
Fiber optics
fiber-optic current sensor
Interrogation
Magnetic sensors
Magnetostriction
magnetostrictive sensor
Monitoring
Optical fiber cables
Optical fiber sensors
Questioning
Sensitivity
Sensors
Temperature compensation
Terfenol alloys
Terfenol-D
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Summary:In this paper, a compact fiber-optic current sensor (FOCS) based on in-fiber Fabry-Perot interferometer (FPI) and magnetostrictive transducer is presented. The in-fiber FPI sensor employed in the proposed FOCS was fabricated with a 273-μm section of capillary fiber spliced between two pieces of 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 current monitoring up to 800 A rms 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 compensation was also developed and employed for characterization of the proposed FOCS 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. 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 current transformers (OCTs).
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2022.3206949