Patent ID: 8646968

Claim:
A method for distributed temperature sensing using Raman scattering in an optical fiber loop disposed in a sensing environment, comprising: interrogating a first end of the optical loop with one or more light signals, and interrogating a second end of the optical loop with one or more light signals; measuring at a first sensor channel an intensity of Raman backscattered light signals returned to the first end of the optical loop, and measuring at a second sensor channel an intensity of Raman backscattered light signals returned to the second end of the optical loop; calculating, from measurements made by each first or second sensor channel, a corresponding first or second plurality of temperature readings corresponding to each of a plurality of points around the optical loop; calculating, based on the first and second pluralities of temperature readings, a plurality of temperature differences corresponding to pairs of points that are co-located along the optical loop; and determining, based on the plurality of temperature differences, a plurality of non-temperature errors corresponding to the plurality of points around the optical loop.