Journal
IEEE PHOTONICS JOURNAL
Volume 8, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2016.2538078
Keywords
Phase-sensitive optical time domain reflectometer (phi-OTDR); Michelson interferometer; wavelength division multiplexing; nuisance alarm rate; event identification; identification rate
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In order to obtain low nuisance alarm rate (NAR) and achieve the disturbance event identification, the wavelength-division multiplexing combination of a phase-sensitive optical time-domain reflectometer (phi-OTDR) and a Michelson interferometer (MI) is proposed and demonstrated. The disturbance is synchronously detected by a phi-OTDR and an MI. A true alarm is presented only when a real disturbance is detected by both phi-OTDR and MI. Furthermore, the event identification of the confirmed real disturbance is recognized by an equivalent frequency distribution analysis on the MI signal. It is found that, by the experiment, NAR can be reduced to 1.2% from 13.5% via a single phi-OTDR, with a high detection probability of 92%. Furthermore, four disturbance events can be distinguished with a 90% identification rate. Our proposed wavelength-division multiplexing of a phi-OTDR and an MI is simple and low cost, no complicated algorithm is required, and only one sensing fiber is needed; therefore, it is an interesting exploration of multiplexing of phi-OTDR and interferometers.
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