Process of Coating Optical Fiber with Composite Coating: Composite Coating: Magnetic Powder- Polymer

摘要

Multi-mode optical fiber with magnetic composite coating was investigated as an optical fiber sensor for magnetic field sensing. The optical fiber magnet sensor element presented in this paper was constructed on the base of intensity-based optical fiber vibration sensors. Magnetic component of composite coating was powder of Nd-Fe-B permanent magnet in form of single domain particles, and polymer component was poly (ethylene-co-vinil acetate) - EVA. The composite coating can be made by adapting the existing process of manufacturing optical fibers in stage in which polymer coating is applied to the drawn fiber. The influence of the applied magnetic field on the change of intensity of the light signal propagated trough optical fiber was investigated. Sensor's element that was constructed was very sensitive for external magnetic field, and completely reversible.