Towards detection of pipeline integrity threats using a smart fiber optic surveillance system: PIT-STOP project blind field test results

Tejedor, Javier; Macías-Guarasa, Javier; Martins, Hugo F.; Piote, Daniel; Pastor-Graells, Juan; Martín‐López, Sonia; Corredera, Pedro; Pauw, Guy De; Smet, Filip De; Postvoll, Willy; Ahlen, Carl Henrik; Gonzalez-Herraez, Miguel

doi:10.1117/12.2263357

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…For such systems, the relation between strain (or temperature) and the backscattered signal is linear only at low levels of perturbations [29]. Typical simplified Phase-OTDR systems do not have countermeasures to avoid nonlinearities; therefore, their use is limited in locating the position of a perturbation and its frequency pattern [30]. Instead, more sophisticated linear setups can measure accurately strain and temperature along the entire sensing range.…”

Section: Introductionmentioning

confidence: 99%

Comparative Assessment and Experimental Validation of a Prototype Phase-Optical Time-Domain Reflectometer for Distributed Structural Health Monitoring

et al. 2022

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Dynamic characterization and Structural Health Monitoring (SHM) are crucial tools, of increasing demand, for reliable operation and predictive maintenance of large infrastructures, as the percentage of critically ageing infrastructures is growing steadily. We present a minimally invasive and synchronous fiber optic monitoring system for SHM, based on Phase-Optical Time-Domain Reflectometry (Phase-OTDR), and we assess its applicability and performance on a modular Bailey-type bridge of 1 : 2.5 scale. Phase-OTDR systems, along with other fiberoptic-distributed techniques have proven their capabilities in long-range SHM applications, although their complexity and high cost limits drastically their applicability and SHM market penetration. Here, we propose the use of a prototype Phase-OTDR system, featuring customized interrogation instrumentation with a balanced trade-off between performance and cost. Its experimental validation is achieved by comparison with well-established commercial monitoring systems, such as Ground-Based Radar Interferometer (GBRI), laser tracker, and multipoint optical Fiber Bragg Gratings (FBGs), in various excitation conditions and structure-damage scenarios, easily implementable in the model bridge. Finite-element modelling (FEM) and simulations were employed to study the bridge behaviour and provide a reference and comparison framework for the experimental characterization. The Phase-OTDR system successfully detected the structural behaviour in an efficient distributed manner, demonstrating comparable performance to commercial point sensor systems, thus demonstrating its application potential.

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Section: Introductionmentioning

confidence: 99%

Comparative Assessment and Experimental Validation of a Prototype Phase-Optical Time-Domain Reflectometer for Distributed Structural Health Monitoring

et al. 2022

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“…Second, the NN in [29][30][31] used a single NN, which is hard to effectively learn the signal characteristics collected by the DAS. Besides, the existing experiments in [32][33][34][35] only utilized the data being generated very close to the sensed area (tens or hundreds of meters), which had a small sensing area or were at a location with a clean background environment.…”

Section: Introductionmentioning

confidence: 99%

An Improved High-Intelligence Method of Gas and Oil Pipeline Prewarning System in Real Soil Environment

Wang

Xing

et al. 2021

Mathematical Problems in Engineering

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With the development of technology, the total extent of global pipeline transportation is also increased. However, the traditional long-distance optical fiber prewarning system has poor real-time performance and high false alarm rate when recognizing events threatening pipeline safety. The same vibration signal would vary greatly when collected in different soil environments and this problem would reduce the signal recognition accuracy of the prewarning system. In this paper, we studied this effect theoretically and analyzed soil vibration signals under different soil conditions. Then we studied the signal acquisition problem of long-distance gas and oil pipeline prewarning system in real soil environment. Ultimately, an improved high-intelligence method was proposed for optimization. This method is based on the real application environment, which is more suitable for the recognition of optical fiber vibration signals. Through experiments, the method yielded high recognition accuracy of above 95%. The results indicate that the method can significantly improve signal acquisition and recognition and has good adaptability and real-time performance in the real soil environment.

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“…For Phase-OTDR systems, the relation between strain (or temperature) and the backscattered signal is linear only at low-intensity light levels [17], as non-linearity appears for increased intensity. While most simplified Phase-OTDR systems are suitable for locating a perturbation and pattern/harmonic detection [18], more sophisticated setups can also measure strain and temperature. Such Phase-OTDR systems, which employ techniques such as coherent detection [19] and chirped pulses [20], can exhibit high performance at very high frequencies of perturbation [21], allowing a direct comparison with well-established point-sensing technologies.…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Phase-OTDR System for Structural Health Monitoring: Design and Instrumentation

2019

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The design, development, and testing of a low-cost phase optical time-domain reflectometry (Phase-OTDR) system, intended for use in structural health monitoring (SHM) applications, are presented. Phase-OTDR is a technology that is growing and evolving at an impressive rate. Systems based on this principle are becoming very sensitive and elaborate and can perform very accurate condition monitoring, but at the same time, they are critically alignment-dependent and prohibitively costly to be considered as viable options in real field applications. Certain Phase-OTDR systems have been applied in real field studies, but these examples are mostly a proof-of-concept. The system presented here is the result of a compromise between performance and cost, using commercial components, specifically combined and tuned for SHM applications. The design and implementation of all the electronic and optoelectronic steps are presented, and the operation of the system is demonstrated, achieving a spatial resolution of ~6 m over 5 km. This work provides useful engineering guidelines for the low-cost implementation of Phase-OTDR systems. It is anticipated that the affordable development of such interrogation systems will promote their use in a wide range of SHM applications with moderate monitoring requirements and will assist the penetration of Phase-OTDR technology in the industry.

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Towards detection of pipeline integrity threats using a smart fiber optic surveillance system: PIT-STOP project blind field test results

Cited by 3 publications

References 2 publications

Comparative Assessment and Experimental Validation of a Prototype Phase-Optical Time-Domain Reflectometer for Distributed Structural Health Monitoring

Comparative Assessment and Experimental Validation of a Prototype Phase-Optical Time-Domain Reflectometer for Distributed Structural Health Monitoring

An Improved High-Intelligence Method of Gas and Oil Pipeline Prewarning System in Real Soil Environment

A Low-Cost Phase-OTDR System for Structural Health Monitoring: Design and Instrumentation

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