Patent ID: 7859654
Filing Date: 2010-12-28
Classification: G01D,G01H,G01M

Abstract:
1. A method of determining a physical parameter associated with an optical fiber, comprising: launching a plurality of interrogating pulses into the optical fiber, wherein at least a first interrogating pulse has a first optical frequency and a second interrogating pulse has a second optical frequency different than the first optical frequency; acquiring, for each of the plurality of interrogating pulses, time resolved Rayleigh backscatter signals at a plurality of locations along at least a portion of the length of the optical fiber; comparing the time resolved Rayleigh backscatter signals from the first plurality of interrogating pulses with the time resolved Rayleigh backscatter signals from the second plurality of interrogating pulses; and based on the comparing, determining a distribution of a first physical parameter along at least the portion of the length of the optical fiber.