Experimental and numerical investigation on temperature measurement of BOTDA due to drop leakage in soil

Abstract Using an advanced Brillouin sensing system (BOTDA) with high spatial resolution, this paper demonstrates the application of the distributed temperature fiber optic sensor (FOS) in small liquid leak detection in soil. The effectiveness and efficiency of the distributed Brillouin sensor in detecting and locating drop leakage in soil is qualitatively verified through a laboratory experiment. Numerical studies based on finite element (FE) method are conducted to simulate the whole drop leak process. The good agreement of the data measured in the experiment and the computational results validates the spatial distribution and the variation trend of the soil temperature field due to drop leakage. A quantitative relation between the active area of the leak-induced temperature field and the FOS measurements is established to determine the size of leak or to propose a FOS-based strategy for leak early warning.

[1]  Y. Koyamada,et al.  Novel Technique to Improve Spatial Resolution in Brillouin Optical Time-Domain Reflectometry , 2007, IEEE Photonics Technology Letters.

[2]  Arup Lal Chakraborty,et al.  Design, development and studies on Raman-based fibre-optic distributed temperature sensor , 2002 .

[3]  Arup Lal Chakraborty,et al.  Compensation for temperature dependence of Stokes signal and dynamic self-calibration of a Raman distributed temperature sensor , 2007 .

[4]  Ram Bilas Pachori,et al.  Raman optical fiber distributed temperature sensor using wavelet transform based simplified signal processing of Raman backscattered signals , 2015 .

[5]  Kwang Suh,et al.  Auto-correction method for differential attenuation in a fiber-optic distributed-temperature sensor. , 2008, Optics letters.

[6]  Yongkang Dong,et al.  Differential Brillouin gain for improving the temperature accuracy and spatial resolution in a long-distance distributed fiber sensor. , 2009, Applied optics.

[7]  J. Frings.  Pipeline Leak Detection using Distributed Fiber Optic Sensing , 2010 .

[8]  B. Culshaw,et al.  Fiber-Optic Sensing: A Historical Perspective , 2008, Journal of Lightwave Technology.

[9]  Didem Ozevin,et al.  Novel leak localization in pressurized pipeline networks using acoustic emission and geometric connectivity , 2012 .

[10]  Marc Nikles,et al.  Leakage detection using fiber optics distributed temperature monitoring , 2004, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[11]  Alireza Bahrampour,et al.  Transient response of buried oil pipelines fiber optic leak detector based on the distributed temperature measurement , 2013 .

[12]  Jahrul M. Alam,et al.  A computational model of thermal monitoring at a leakage in pipelines , 2016 .

[13]  K. Shimizu,et al.  Coherent self-heterodyne Brillouin OTDR for measurement of Brillouin frequency shift distribution in optical fibers , 1994 .

[14]  Lee Sheng Chyan,et al.  Performance enhancement of BOTDR fiber optic sensor for oil and gas pipeline monitoring , 2010 .

[15]  Liang Chen,et al.  Recent Progress in Brillouin Scattering Based Fiber Sensors , 2011, Sensors.

[16]  Bryan W. Karney,et al.  A selective literature review of transient-based leak detection methods , 2009 .

[17]  X. Bao,et al.  Dependence of the brillouin frequency shift on strain and temperature in a photonic crystal fiber. , 2004, Optics letters.

[18]  D. Inaudi,et al.  LONG-RANGE PIPELINE MONITORING BY DISTRIBUTED FIBER OPTIC SENSING , 2010 .