A simple fiber optic magnetic field and current sensor with spectral interrogation

• Published in: Optics communications 2023-01, Vol.527, p.128930, Article 128930
• Main Authors: Eftimov, Tinko, Dyankov, Georgi, Kolev, Petar, Vladev, Veselin
• Format: Article
• Language: English
• Subjects: BSO crystal; Faraday effect; Fiber optic current sensor; Polarimetric scheme; Wavelength dependent interrogation
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2022.128930

In this paper we present a simple fiber optic sensor for magnetic-field/electric current measurement in a BSO crystal. We make use of a simple polarimetric scheme based on a broadband white LED source and a spectral detection in combination with 200μm multimode fiber. A detailed Mueller–Stokes polarization analysis is presented with simulation of expected performance. It is confirmed that the sensitivity is wavelength dependent and increases from 0.138 nm/A at 540 nm to 0.224 nm/A at 715 nm a minimum current change of 0.2 A and an average dynamic range of 33 dB have been achieved. •A simple spectrally encoded BSO crystal based polarimetric current sensor proposed.•White LED, plastic film polarizers, optical fibers and CCD arrays used to detect spectral shifts.•Sensitivities of 0.138 nm/A at 540 nm to 0.224 nm/A at 715 nm have been measured.•Minimum current of 0.2 A and an average dynamic range of 33 dB have been achieved.