Abstract
We report about the possibility of using regenerated fiber Bragg gratings generated in photosensitive fibers without applying hydrogen loading for high temperature sensor networks. We use a thermally induced regenerative process which leads to a secondary increase in grating reflectivity. This refractive index modification has shown to become more stable after the regeneration up to temperatures of 600 °C. With the use of an interferometric writing technique, it is possible also to generate arrays of regenerated fiber Bragg gratings for sensor networks.
Highlights
Fiber Bragg gratings are well established as strain and temperature sensors, in the field of structural health monitoring in civil engineering and in the aerospace and medical industries
A new type of refractive index modification was introduced by Canning et al [1,2], which leads to a regeneration of fiber Bragg gratings at temperatures of about 900 °C
We recently reported a similar process in germanium doped fibers but without any hydrogen loading and by using the 248 nm wavelength for grating inscription [3]
Summary
Fiber Bragg gratings are well established as strain and temperature sensors, in the field of structural health monitoring in civil engineering and in the aerospace and medical industries. A new type of refractive index modification was introduced by Canning et al [1,2], which leads to a regeneration of fiber Bragg gratings at temperatures of about 900 °C. This regenerative process was observed in germanium-boron-doped photosensitive fibers but only by applying hydrogen loading. By using an interferometric grating writing technique we can generate arrays of regenerated fiber Bragg gratings for high-temperature sensor networks. The concept of such array sensor structures is discussed in this paper
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