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Fiber-optic current sensors utilize the Faraday effect in fused silica fiber to measure electric current. Since the effect is wavelength dependent, high sensor accuracy requires a stable source wavelength. Commonly used semiconductor sources require temperature stabilization within ≈0.1°C for adequate wavelength stability that adds extra cost. Here, we theoretically and experimentally demonstrate...
We theoretically and experimentally demonstrate a method to achieve insensitivity to temperature to within <±0.1% from −40 to 85°C for fiber-optic current sensors with dynamic and static phase biasing and different types of sensing fiber.
In this paper, we present an experimental and theoretical study on how thermal fiber annealing influences the temperature dependence of the interferometric fiber-optic current sensor. Such sensors measure the current-induced phase shift (Faraday effect) between left and right circularly polarized light waves in a reflective fiber coil around the current conductor. The fiber-optic phase retarder at...
The previously demonstrated inherent temperature compensation of an interferometric fiber-optic current sensor is extended to the cases of large Faraday phase shifts and strong bend-induced birefringence in the sensing fiber.
Fiber-optic wave retarders made from a short section of polarization-maintaining (pm) fiber are crucial components of interferometric fiber-optic current sensors for high-voltage substations [1]. Another potential application of such retarders is in chiral spectroscopy, e. g. for the detection of specific molecules. In a fiber-optic current sensor, as considered here, the magnetic field of the current...
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