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A fiber-optic current sensor (FOCS) is a device designed to measure direct current. Utilizing a single-ended optical fiber wrapped around the current conductor, [1] FOCS exploits the magneto-optic effect (Faraday effect). [2] The FOCS can measure uni- or bi-directional DC currents up to 600 kA, with an accuracy within ±0.1% of the measured value.
Practical Fiber Optic Current Sensors • Source light passes through a polarizer → Equally split linear states of polarization • Quarter wave-plate converts linearly polarized light into circularly polarized light
FOCS/OCTs offer significant advantages over traditional current sensing technologies; the sensor element is naturally decoupled from the voltage line, there is minimal electrical interference on the signal line, they offer extremely fast response times with high
All fiber optic current sensors can overcome the shortcomings of traditional electromagnetic current transformer in volume, weight, safety, environmental protection, dynamic range and so on. It has broad application prospects in high voltage, ultra-high voltage applications and smart grid.
This work reviews the fiber-optic sensors based on Bragg gratings, long period gratings, interferometers, surface plasmon resonance, fluorescence, and light diffusion. Brief theory of sensing principle, fabrication method, applications, advantages and disadvantages of the different fiber-optic sensors, are addressed.
Measuring the polarization rotation due to the Faraday effect is the basic principle of Fiber Optic Current Sensors (FOCS) and Optical Current Transformers (OCTs).
The sensor uses the Faraday effect in optical fiber and standard polarimetric measurements to sense electrical current. The primary component of the sensor is a specially treated coil of single-mode optical fiber, through which the current carrying conductor passes. Improved precision is accomplished by temperature
Optical fiber current sensor (OFCS) based on Faraday magneto-optic effect has many advantages of immunity against electromagnetic interference, high sensitivity and wide dynamic range. Thus, OFCS has extensive application prospects.
An all fiber optic current sensor (AFOCS) utilizing ordinary optical fiber is proposed and demonstrated, which is implemented with a phase-shift fiber loop ringdown (PS-FLRD) structure. The current-induced rotation angle is converted into a minute change in transmittance of the fiber loop, which can be obtained by measuring the phase shift.
Advantages of Fiber Optic Sensors • Nonelectrical • Explosion proof • Often do not require contact • Remotable • Small size and light weight • Allow access into normally inaccessible areas • Potentially easy to install (EMI) • Immune to radio frequency interference (RFI) and electromagnetic interference (EMI) • Solid state ...