Greenberg Traurig, LLP
Distributed acoustic sensing
Systems and methods for sensing changes in an optical sensing fibre, principally for detecting changes in strain. A plurality of optical probe pulses at different optical frequencies (f1, f2, . . . fn) spaced by Δf are transmitted into the sensing fibre. Light backscattered from the optical sensing fibre may be mixed with delayed backscatter frequency shifted by Δf+fm where fm is a heterodyne frequency. The backscattered or mixed light may be detected to determine changes in the sensing fibre. Δf may be chosen to optimise performance.
FOCUS SENSORS LTD.
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Edward Alfred Denzil Weizhong
Austin Zhao