| Citation: | WANG Zi-hao, LIU Zhi-kai, FENG Yu-xiang, ZHANG Cheng-long, LV Li-dong. Improvement of signal-to-noise ratio for phase-sensitive optical time-domain reflecting system[J]. Chinese Optics. doi: 10.37188/CO.2024-0122
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The sensitivity of phase-sensitive optical time-domain reflecting (Φ-OTDR) system is limited by the intrinsic system noise such as the phase noise of the laser, the spontaneous emission noise of the erbium-doped fiber amplifier, and the shot noise and thermal noise of the photodetector, as well as the random noise in the environment. Therefore, the noise reduction algorithms based on the optical time-domain reflecting data is investigated to improve the signal-to-noise ratio (SNR) of the system without degrading the frequency response range. And the Savitzky-Golay smoothing algorithm is proposed by selecting a slidable window with fixed-length to process OTDR data for the SNR improvement, while maintaining the system sampling frequency, and then, the experimental system is built to demonstrate the results. The experimental results show that by using the Savitzky-Golay smoothing algorithm, the SNR of the system is improved by 5.41dB relative to that by difference method with the original data, and the SNR is improved by 3.39dB and 5.05dB respectively, compared to the commonly used cumulative averaging method and sliding averaging method. It is demonstrated that the Savitzky-Golay smoothing algorithm can improve the sensitivity and accuracy of the Φ-OTDR system, which helps to accurately sense weak vibration events and reduce false alarm rate.
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