Mr. Xiang Zhong Profile

Xiang Zhong

at Beihang Univ

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Proceedings Article | 26 January 2016 Paper

Influences of pulse on the performance of phase-sensitivity OTDR

Chunxi Zhang, Xiang Zhong, Lijing Li

Proceedings Volume 9903, 99031Z (2016) https://doi.org/10.1117/12.2214272

KEYWORDS: Visibility, Sensors, Scattering, Backscatter, Laser sources, Light scattering, Reflectometry, Fiber optics sensors, Sensing systems, Computer simulations

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The influences of pulse, including the pulse width T_p and the peak pulse power I_peak, on phase-sensitivity optical time domain reflectometer (φ-OTDR) based distributed vibration sensor are investigated in this paper. A numerical simulation is performed to illustrate the relationships between pulse and fluctuations ratio coefficient (FRC) as well as visibility of interferential Rayleigh backscattering light. The simulation results show that the method of amplifying I_peak is benefit for increasing the FRC induced by vibration, while it is useless for improving the visibility. In contrast, the method of broadening T_p is useful for increasing the FRC by improving the visibility. Laboratory experiments are implemented by using the φ-OTDR prototype with an electro-dynamic vibration table producing stable vibration signals. The good agreement of experimental with simulated results validates the theoretical analysis.

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