Resonant Fiber Optic Current Sensor Based on Broadband Light Source

The monitoring of current in real time is crucial for the maintenance of the power grid system. In this paper, we propose and experimentally demonstrate a novel fiber optic current sensor based on resonance frequency difference detection using a single-mode fiber ring resonator (FRR). The sensing sy...

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Bibliographic Details
Published in:Journal of lightwave technology 2024-09, Vol.42 (18), p.6592-6598
Main Authors: Zhang, Sizhe, Liu, Qingwen, Chang, Yanming, He, Zuyuan
Format: Article
Language:English
Subjects:
Broadband
Circular polarization
Cost analysis
Current measurement
Error analysis
Faraday effect
fiber optic current sensors (FOCS)
Fiber optics
fiber ring resonator (FRR)
Frequency modulation
Interference
Light sources
multiple beam interference
Optical fiber couplers
Optical fiber polarization
Optical fiber sensors
Optical ring resonators
Resonance
resonance frequency difference
Resonant frequency
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Summary:The monitoring of current in real time is crucial for the maintenance of the power grid system. In this paper, we propose and experimentally demonstrate a novel fiber optic current sensor based on resonance frequency difference detection using a single-mode fiber ring resonator (FRR). The sensing system utilizes the Faraday effect, which behaves as the resonance frequency difference between the two circularly polarized lightwaves in the FRR. By measuring this resonance frequency difference, the current can be accurately determined. The current sensor exhibits a sensitivity of 41.53 Hz/A within a measurement range of 0-400 A, with a relative error of less than 0.2%, and an optimized current accuracy of 0.5 A. The main limiting factor affecting the noise performance of the system is analyzed. This research provides new insights into research and low-cost applications in the field of current sensing.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2024.3381474