Distributed Temperature Sensing

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The measurements do not rely on electronic or mechanical sensors at discrete locations along the line, but rather by observing the physical interactions between probing light energy and the fiber optic medium.  

Because the measurements do not rely on a multitude of discrete sensors, they can be taken at virtually all locations along the length of a cable and are inherently more reliable than former technology. The optical fiber can be thought of as a long thermocouple, along the entire length of which the distributed temperature profile can be determined.