Leak Detection and Distributed Temperature Measurement Sensing System
From Piping
A reading unit constantly launches a high frequency light pulse of one specific wave length through an optical fiber. The major part of the light exits the fiber at the far end. A small part of the light however is backscattered to the reading unit. This backscattering occurs at every point along the fiber. As a result of photo-acoustic phenomena the backscattered spectrum does not only show the original frequency of the light that is launched into the fiber but contains two additional frequencies: the so-called Brillouin and Raman frequencies. The latter is utilised in DTS: there is a defined relation between the intensity of the Raman frequency and the temperature of the fiber. Measuring the Raman frequency at length intervals of e.g. 1,00m results in the distributed temperature over the length of the fiber and thus of the object (e.g. a pipe line) to which the fiber is connected or of the medium (e.g. soil) in which the fiber is embedded.
Products Details
The location of each measurement results from measuring the time that has lapsed between launching of the pulse and receipt of the backscattered light (Radar principle – the speed of light is constant).
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