Patent ID: 8666203
Filing Date: 2014-03-04
Classification: G01D

Abstract:
1. An optical fibre sensor assembly comprising: a source of a plurality of different frequency substantially monochromatic signals, the signals having particular wavelengths, to output said signals in to an optic fibre; a plurality of optical drop multiplexers (ODMs), said ODMs arranged along said optic fibre and adapted to successively separate signals of each different wavelength; a plurality of sensor arrays, each array comprising a plurality of sensor elements and adapted to receive respective signals of each different wavelength, each sensor element in the array produces a different signal at its output with each signal being modulated by the respective sensor element, the modulation being the time taken by the signal to pass through the sensor element and be reflected by a reflective end of the sensor element; a plurality of optical add multiplexers (OAM) arranged successively to combine modulated sensor signals output from said plurality of sensor arrays; and an interrogation system, having a plurality of inputs connected such that each input receives the output signal from a respective sensor array, the interrogation system and associated sensor arrays being arranged such that the data from each sensor element can be resolved.