ABSTRACT
This chapter discusses the many configurations of all-fiber optical current sensors that have been investigated over the past three decades. They include various types of polarimetric sensors, Sagnac interferometer sensors, interferometric and polarimetric sensors with polarization-rotated reflection, Fabry-Pérot and light recirculating sensors, fiber laser current sensors, integrated-optic current sensors, magneto-optic fiber Bragg gratings, and distributed sensors. Particular focus is on sensors with polarization-rotated reflection, one of the most successful concepts. Intrinsic temperature compensation of these sensors is discussed for both spun highly birefringent sensing fibers and low birefringence fibers. Theoretical and experimental results show accuracy to within ±0.1% between −40°C and 85°C.
