A high performance distributed sensor system with multi-intrusions simultaneous detection capability based on phase sensitive OTDR

作者：Zhan, Y.^*; Yu, Q.; Wang, K.; Yang, F.; Kong, Y.; Zhao, X.

来源：Opto-electronics Review, 2015, 23(3): 187-194.

DOI：10.1515/oere-2015-0032

• distributed optical sensor
• optical time domain reflectometer
• phase sensitive
• multi-intrusion detection
• interrogation method
• Rayleigh backscattering

A high performance distributed sensor system with multi-intrusions simultaneous detection capability based on phase sensitive OTDR (Phi-OTDR) has been proposed and demonstrated. To improve system performance, three aspects have been investigated. Firstly, a model of one-dimensional impulse response of backscattered light and a Monte Carlo method have been used to study how the laser linewidth affects the system performance. Theoretical and experimental results show that the performances of the system, especially the signal-noise-ratio (SNR), decrease with the broadening of laser linewidth. Secondly, a temperature-compensated fibre Bragg grating with a 3 dB linewidth of 0.05 nm and a wavelength stability of 0.1 pm has been applied as an optical filter for effective denoising. Thirdly, a novel interrogation method for multi-intrusions simultaneous detection is proposed and applied in data denoising and processing. Consequently, benefiting from the three-in-one improvement, a high performance Phi-OTDR has been realized and four simultaneous applied intrusions have been detected and located at the same time along a 14 km sensing fibre with a spatial resolution of 6m and a high SNR of 16 dB. To the best of our knowledge, this is the most multi-functional Phi-OTDR up to now and it can be used for perimeter and/or pipeline intrusion real-time monitoring.

• 出版日期2015-9
• 单位东华大学