Fiber optic sensor for pH measurement, has sensor head with area covered with thin sensitive layer of copolymer, where layer has high refractive index and forms micro environment for coloring material and reaches refractive index of core

摘要

The sensor has a segment of a multi-mode light-wave cable whose one of the ends forms a sensor head. The coating and the cladding of a fiber are removed in an area of the head, so that a core (1.7) lies freely and the area is covered with a thin pH-sensitive layer (1.2) of copolymer that has high refractive index and forms a micro environment for an immobilized coloring material, where the layer reaches a refractive index of the core.