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A location method based on the Lissajous figure is proposed for fiber-optic distributed disturbance sensor based on Mach–Zehnder interferometer. The disturbance is located by the fiber-optic distributed disturbance sensor due to the time delay between the two signals from clockwise and counter-clockwise Mach–Zehnder interferometers. In the Lissajous figure of the two signals, a fitting ellipse with...
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