FIBRE OPTIC DISTRIBUTED SENSING

摘要

A method of distributed fibre optic sensing is described in which an optical fibre (104) is interrogated with electromagnetic radiation; back-scattered radiation is detected; and the returns are processed to provide a measurement signal (310) for each of a plurality of longitudinal sensing portions of the optical fibre. The method comprises analysing the measurement signals of a first subset of longitudinal sensing portions to provide a first zone (306a) having a first sensing function and analysing the measurement signals of at least a second subset of longitudinal sensing portions to provide at least a second zone (306b) having a second, different, sensing function. The different sensing functions may include detecting different events of interest. In some embodiments the geometry of the fibre may provide different sensing zones (406a, 406b).