Systems and methods for detecting disturbance events in optical fibres
AssigneeFiber Sense Limited
InventorsPeter HUBBARD, Nathaniel LINDSEY, William BLEWETT
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Abstract
There is provided a phase-sensitive optical time domain reflectometry (φ-OTDR)-based method for detecting a disturbance event in an optical fibre. The method includes determining the probability of occurrence of predetermined phase difference values between successive samples of a processed backscattered signal from the optical fibre, to detect the existence or otherwise of the disturbance event.
Claims21
A phase-sensitive optical time domain reflectometry (φ-OTDR)-based method for detecting a disturbance event in an optical fibre, the method including:
- determining the probability of occurrence of predetermined phase difference values between successive samples of a processed backscattered signal from the optical fibre, to detect the existence or otherwise of the disturbance event.
A method for detecting a disturbance event in an optical fibre, the method including:
- transmitting an optical signal in the optical fibre;
- receiving a backscattered optical signal from the optical fibre responsive to the transmitted optical signal;
- combining the backscattered optical signal with an optical reference signal to obtain a combined signal;
- sampling the combined optical signal;
- determining phase differences between adjacent samples of the sampled combined optical signal;
- and
- determining whether a threshold value of the determined phase differences lie in a predetermined phase range to determine whether or not a disturbance event has occurred.
21-23. (canceled)
Dependencies are inferred from the claim text.