Distributed fibre optic sensing
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United States of America Patent
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Apr 25, 2017
Grant Date -
Sep 6, 2012
app pub date -
Nov 11, 2010
filing date -
Nov 13, 2009
priority date (Note) -
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Abstract
Techniques for determining lateral offset of the source of an acoustic disturbance in a distributed acoustic fiber optic sensor are described. The sensor comprises an optical source (112) for interrogating an optical fiber (104) and a detector (116) and processor (108) arranged to detect any backscattered radiation and determine a measurement signal for a plurality of discrete longitudinal sensing portions of the optical fiber. The processor is also arranged to analyse the measurement signals to identify signals corresponding to the same acoustic wave arriving at different parts of the fiber and determine from the time of arrival of said acoustic wave the direction and/or distance of the origin of said acoustic wave from the optical fiber. The geometry of the fiber may be arranged to ensure that any positional ambiguity can be resolved and the use of multiple fibers (501, 502) is disclosed.
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