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Sensors 2015, 15(9), 21957-21970; doi:10.3390/s150921957

A Long Distance Phase-Sensitive Optical Time Domain Reflectometer with Simple Structure and High Locating Accuracy

State Key Laboratory for Precision Measurement Technology and Instrument, Tianjin University, Tianjin 30072, China
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Academic Editor: Vittorio M. N. Passaro
Received: 24 June 2015 / Revised: 25 August 2015 / Accepted: 26 August 2015 / Published: 2 September 2015
(This article belongs to the Special Issue Silicon Based Optical Sensors)
View Full-Text   |   Download PDF [1152 KB, uploaded 2 September 2015]   |  

Abstract

A phase-sensitive optical time domain reflectometer (Φ-OTDR) can be used for pipeline security. However, the sensing distance (less than 20 km) of traditional Φ-OTDR is too short for the needs of typical oil and gas pipeline monitoring applications (30–50 km). A simple structure Φ-OTDR system utilizing long pulse, balanced amplified detector and heterodyne detection is proposed in this paper and the sensing range is thereby increased to 60 km. Through analyzing the sensing principle of Φ-OTDR, a novel locating strategy is proposed to maintain the locating accuracy at a few meters when a long pulse (5 µs) is used. The increased pulse width deteriorates the time series of each sensing point seriously. In order to eliminate the deterioration, a data processing technique combining wavelet and empirical mode decomposition is applied in this system. The experiment results show that the sensing distance can be increased to 60 km and the locating accuracy is maintained at 6.8 m. View Full-Text
Keywords: vibration analysis; scattering measurements; optical time domain reflectometry vibration analysis; scattering measurements; optical time domain reflectometry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shi, Y.; Feng, H.; Zeng, Z. A Long Distance Phase-Sensitive Optical Time Domain Reflectometer with Simple Structure and High Locating Accuracy. Sensors 2015, 15, 21957-21970.

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