One of the primary issues with FOCS is temperature-induced measurement errors. Variations in ambient or device temperature can significantly affect the Faraday rotation angle, leading to inaccuracies in current measurement. Research has shown that temperature fluctuations in the range of −45 °C to 70 °C can degrade sensor accuracy, necessitating compensation methods such as AI-based predictive algorithms or temperature-insensitive materials like TGG crystals to maintain precision .
FOCS rely on precise optical components, including interferometers, modulators, and polarization-maintaining fibers. Degradation of these components due to stress, damp heat, or long-term operation can shift the source wavelength, alter birefringence, or increase insertion loss, potentially changing the sensor scale factor or causing failure . Ensuring long-term reliability requires careful packaging, burn-in procedures, and environmental testing.
The measurement principle involves detecting differential magneto-optic phase shifts between circularly polarized light waves. This requires complex interferometric setups, closed-loop feedback circuits, and advanced signal processing to linearize the sensor response and compensate for environmental effects . Such complexity increases system cost and may complicate integration into existing power systems.
FOCS must operate in harsh industrial environments, including high-voltage substations and electrolytic processes. Humidity, mechanical stress, and vibration can affect optical alignment and sensor performance. Additionally, miniaturization and integration into compact devices can be challenging without compromising sensitivity .
While fiber optic current sensors provide high accuracy, wide bandwidth, and immunity to electromagnetic interference, their main problems include temperature sensitivity, optical component degradation, complex signal processing requirements, and environmental vulnerabilities. Addressing these challenges involves advanced materials, compensation algorithms, robust packaging, and careful system design to ensure reliable, long-term operation in industrial and high-voltage applications .
Fiber-optic current sensors (FOCS) based on Faraday magneto-optical effect have plenty of advantages in comparison
Optical Fiber (Transmission Medium, Sensing Element) Light modulated due to interaction with parameter of interest (Measurand)
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