Patent ID: 9239249
Filing Date: 2016-01-19
CPC Classification: G01D,G01K,G01L,G01M

Claim Text:
1. An optical fibre sensor system for measuring an operating condition at a plurality of locations, the sensor system comprising: a sensor optical fibre; a light source for inputting light into the sensor optical fibre; a light detector for receiving light from the sensor optical fibre; and a processor for outputting measurements of the operating condition corresponding to the plurality of locations based on light received at the light detector; wherein the sensor optical fibre comprises a plurality of optical gratings, each optical grating in use being disposed at a respective location and arranged to operate over a respective range of wavelengths depending on variations in the operating condition; wherein a first of the plurality of optical gratings is a master grating and is arranged to operate over a first wavelength range, the first wavelength range being distinct from a second wavelength range over which other optical gratings of the plurality of optical gratings are arranged to operate, and wherein the other optical gratings are arranged such that the respective wavelength ranges over which the other optical gratings operate are spaced apart from the first wavelength range by a respective predetermined interval and such that the respective wavelength range of each of the other optical gratings overlaps the respective wavelength range of at least one other of the other optical gratings; wherein the processor is operable to determine a value of the operating condition at the location of the master grating based on a first wavelength value received in the first wavelength range, and to determine a value of the operating condition at the location of a first one of the other optical gratings based on the first wavelength value, a second wavelength value received in the second wavelength range, and predetermined intervals by which the overlapping wavelength ranges are spaced apart from one another.