Optical fiber grating sensors and methods of manufacture

摘要

Systems and methods comprise or involve optical fibers having Bragg gratings. The optical fibers can be assembled in a parallel manner into a fiber sensor configuration. Bragg gratings can be written onto different cores of optical fibers. Bragg gratings may be written at a same or nearly same axial position for all optical fibers in the configuration and may be written at the same time and may have a substantially equal index of refraction variation and unequal lengths. Spaced Bragg gratings may also have characteristic sidelobe spectrums for tagging the respective gratings. Gratings can also be written at different wavelengths and over another grating at the same location.

主权项

1. A Bragg sensor system, comprising:
a plurality of single core optical fibers assembled into a fiber sensor configuration in which the respective fiber cores are aligned substantially parallel to one another, each fiber core having written thereon one or more Bragg grating arrays, wherein at least one of the optical fibers has a distribution of Bragg gratings in which a density of gratings in a proximal portion of the respective fiber is lower than a density of gratings in a distal portion of the respective fiber.