Patent ID: 6817759
Filing Date: 2004-11-16
Classification: G01K

Abstract:
A method for distributed temperature measurement, comprising the steps of:providing a reference fiber and sensing fiber sections of an optical fiber; supplying a laser source with an optical pulse to the optical fiber and obtaining a first Brillouin spectrum A(t0) in the reference fiber section of the optical fiber; obtaining second and third Brillouin spectra A(t1) and A(t2) in a temperature overlapped region of the optical fiber sections; determining a real Brillouin spectrum profile B of the sensing fiber section according to a corresponding weighting factor W(tiâˆ’td) determined based on at least part of the measured Brillouin spectra, and selected from a weighting factors chart; and, determining a temperature distribution according to Brillouin frequency shifts of the real Brillouin spectrum profile B.