DUAL SOURCE CALIBRATION FOR DISTRIBUTED TEMPERATURE SYSTEMS

摘要

A distributed sensor system for locating and measuring corrosion along the length of an extended object or objects on which a single line of optical sensing fiber is deployed in close proximity comprising:
a. an electromagnetic radiation source for emitting a primary emission of light;
b. an optical sensing fiber coupled to said electromagnetic radiation source, said optical sensing fiber illuminated by said electromagnetic radiation source and wherein said optical sensing fiber comprises:
i. a core;
ii. a cladding surrounding said core;
iii. wherein a luminescent material is integrated into the cladding surrounding said core and arranged to provide a backscattered luminescent emission;
iv. and wherein said luminescent material is selected to interact with corrosion chemicals so that the luminescent material's resulting backscattered luminescent emission changes in intensity and/or peak wavelength when exposed to corrosion of said extended object or objects;
c. a photo detector for receiving and measuring said backscattered luminescent emission; and
d. a signal processor for receiving outputs from said detector for determining corrosion location and magnitude.