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SYSTEM FOR IMPROVING THE DYNAMIC RANGE AND REDUCING MEASUREMENT UNCERTAINTY IN FIBRE OPTIC DISTRIBUTED SENSORS AND FIBRE OPTIC DISTRIBUTED MEASUREMENT EQUIPMENT
US2012062875
The present disclosure is based on distributed amplification based on the Raman Effect, consisting of one or more pump lasers (5) at various wavelengths combined with a variable number of fibre optic reflectors (6). These elements induce in the fibre optic sensor (4) or measurement object the necessary conditions for the propagation of the sensor or measurement equipment signals in virtual transparency mode, improving the signal-to-noise ratio in the sensor and measurement equipment signal, improving the dynamic range and increasing the range of the sensor or measurement equipment by up to 250 km.
a fibre optic distributed sensing system based on Rayleigh scattering, Raman Effect or Brillouin Effect, comprising at least one probe and pump signal emission source, and at least one detector or spectral analyser, a fibre optic sensor that transmits signals, said fibre optic sensor being used as a sensory element which is connected to the distributed sensing system by means of at least one input/output port, through at least one coupler, and a Raman Effect distributed amplification system, comprising at least one pump laser at various wavelengths, said pump laser being adapted to pump the fibre optic sensor from its ends, and at least one reflector combined with the fibre optic sensor, said reflector being adapted to improve the signal-to-noise ratio in the signals transmitted by the fibre optic sensor and increase the length of scope of the sensor or distributed measurement equipment.