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检索条件"主题词=distributed temperature sensor"

共 73 条记录，以下是51-60 订阅

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distributed Fiber Optics Techniques for Gas Network Monitoring

Distributed Fiber Optics Techniques for Gas Network Monitori...

引用

IEEE International Conference on Industrial Technology (ICET)

作者： Campanella, Carlo Edoardo Ai, Gang Ukil, Abhisek Nanyang Technol Univ Energy Res Inst ERIAN Singapore Singapore Nanyang Technol Univ Sch EEE Singapore Singapore

ISBN: (纸本)9781467380751

Robust and real-time condition monitoring of the underground gas distribution network (ca. 3000 km) in Singapore is critical for interruption-free power generation. For this purpose, in this paper, we investigate optical techniques, based on distributed fiber optic sensors, recently proposed in the context of the gas pipeline monitoring. A detailed review of these techniques and their applications in terms of sensing range, spatial, temperature and strain resolutions has been generalized. During gas leaks, Joule-Thomson (JT) cooling effect takes places. The temperature drops due to Joule-Thomson cooling effect for argon (has similar JT effect to methane) at various operating conditions are analyzed. It could be detected by the distributed temperature sensing (DTS), for monitoring leaks in the underground gas network.

关键词： Condition monitoring distributed temperature sensor DTS fiber optics Joule Thomson cooling gas network underground gas pipeline natural gas argon

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Remote amplification in long range distributed Brillouin-based temperature sensors

Remote amplification in long range distributed Brillouin-bas...

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17th International Conference on Optical Fibre sensors

作者： Cho, YT Alahbabi, MN Brambilla, G Newson, TP Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England

A remotely pumped EDFA combined with Raman amplification was used to enhance the performance of spontaneous Brillouin intensity-based temperature sensor. A temperature resolution of 5.7 degrees C, spatial resolution o... 详细信息

ISBN: (纸本)0819458554

关键词： distributed sensing distributed temperature sensor Brillouin scattering distributed Raman amplification remote amplification

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RETROFITING EXISTING OPTICAL FIBER INFRASTRUCTURE TO MITIGATE GEOHAZARD RISK: THE TGP CASE

RETROFITING EXISTING OPTICAL FIBER INFRASTRUCTURE TO MITIGAT...

引用

4th ASME-ARPEL International Pipeline Geotechnical Conference (IPG)

作者： Ravet, Fabien Melo, Alberto Oliveros, Francisco Rochat, Etienne Omnisens Morges Switzerland Compania Operadora Gas Lima Peru

ISBN: (纸本)9780791885055

Optical fiber cables (OFC) are well known for their use in communications. They offer long distance and fast transmission rate capabilities. OFC are the perfect companion of hydrocarbon and water transport system as part of the physical layer of the communication services and SCADA of the operating companies. As an example, the TGP system has more than 1400 km of cables laid in its Right-of-Way (ROW) which are in use since the beginning of its operation in 2004. More recently OFC started to be used as sensors. In such applications, a communication cable (CC) can be turned into a continuous temperature sensor allowing for leak and erosion detection. A strain monitoring cable (SMC) can also be spliced to the CC for landslide and subsidence detection in selected areas. In the case of very large soil displacement, it is common to observe the strain induced on the CC. From what precedes, existing OFC infrastructures can be taken advantage of to retrofit pipelines with monitoring instrumentation. The current work describes how an existing CC is retrofitted to provide information about the TGP transport system's integrity. When accurate monitoring of a landslide is required, a dedicated sensing cable is installed locally and connected to the CC. Elsewhere the CC is being measured to detect and locate events as erosion or landslide in position where the geohazard risk present lower probability. Such approach not only improves geohazard risk management, but it also indicates early sign of stress on the cable that can lead to its rupture, mitigating service interruption probability.

关键词： geotechnical monitoring geohazard risk mitigation landslide subsidence erosion optical fiber sensors distributed temperature sensor distributed strain sensor Brillouin scattering

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Advances in high resolution distributed sensing using a time-resolved photon counting technique 6

Advances in high resolution distributed sensing using a time...

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Conference on distributed and Multiplexed Fiber Optic sensors VI

作者： Feced, R Farhadiroushan, M Rodriguez, P Handerek, V Rogers, AJ King's College London (United Kingdom)

ISBN: (纸本)0819422266

A very high resolution distributed optical-fibre temperature sensor system has been demonstrated using a time-resolved photon counting technique. The spatial resolution of the system is 3.5 cm. A temperature sensitivity of 2 degrees C has been achieved with 1 minute integration time when averaging the data points over 10 cm. The system offers a practical solution for life assessment and monitoring of hot spots along the steam pipes in power plants.

关键词： distributed temperature sensor Raman thermometry time-correlated single photon counting

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Hydrogen and radiation induced effects on performances of Raman fiber-based temperature sensors

Hydrogen and radiation induced effects on performances of Ra...

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23rd International Conference on Optical Fibre sensors

作者： Cangialosi, C. Ouerdane, Y. Girard, S. Boukenter, A. Cannas, M. Delepine-Lesoille, S. Bertrand, J. Paillet, P. Univ Lyon CNRS Lab Hubert Curien UMR 5516 F-42000 St Etienne France Univ studi Palermo part imento Fis Chim I-90123 Palermo Italy Natl Radioact Waste Management Agcy Andra F-92298 Chatenay Malabry France CEA DAM DIF F-91297 Arpajon France

ISBN: (纸本)9781628411751

Raman distributed temperature sensors (RDTS) offer exceptional advantages for the monitoring of the envisioned French deep geological repository for nuclear wastes, called Cigeo. Here, we present experimental studies on how the performances of RDTS evolve in harsh environments like those associated with H-2 or gamma-rays. Both of them are shown to strongly affect the temperature measurements made with RDTS. We showed that by adapting the characteristics of the used fiber for the sensing, we could limit its degradation but that additional hardening by system studies will have to be developed before integration of RDTS in Cigeo.

关键词： distributed temperature sensor RDTS optical fibers hydrogen loading radiation nuclear waste

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distributed temperature SENSING FOR EROSION DETECTION AND DOC ESTIMATION: THE PERU LNG EXPERIENCE IN AYACUCHO AND ICA DEPARTMENTS

DISTRIBUTED TEMPERATURE SENSING FOR EROSION DETECTION AND DO...

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4th ASME-ARPEL International Pipeline Geotechnical Conference (IPG)

作者： Ravet, Fabien Silva, Christian Gil, Rodolfo Rochat, Etienne Maguire, Simon Omnisens Morges Switzerland Hunt LOC Lima Peru

ISBN: (纸本)9780791885055

Pipelines often cross challenging terrains where natural hazards are the main risk for their integrity. Environmental conditions can also worsen over the infrastructure lifetime. To reduce the risk of disasters, integrity programs are developed and require tools for early detection of threats that can lead to a failure with dramatic social, environmental and economic consequences. Fiber optic based Geotechnical Monitoring System (GMS) have been used and implemented as an efficient prevention tools of these programs. As a good example, GMS is successfully in operation to detect landslides using distributed Strain Sensing along the Sierra section of the Peru LNG pipeline since 2010. The continuous operation of the GMS also revealed that infiltration, erosion and sand dune migration can be detected using distributed temperature Sensing (DTS). First, hydraulic erosion was evidenced in the Sierra region. More recently, events whose origin is eolian erosion and sand dune migration have been identified. A thermal analysis was then conducted to analyze the measured thermal signatures of the detected event. It revealed that the DoC (Depth-of-Cover) can be computed from the temporal response of the fiber optic cable. The time lag between ambient temperature and temperature of the cable directly relates to its burial depth. The obtained data are compared with site inspection observation which confirm the validity of the DTS approach. The method, combining DTS measurements on existing communication cable with thermal analysis, offers the ability to monitor erosion related geohazards in both Sierra and desert sections of the pipeline. The results of the presented work illustrate the potential value of fiber optic sensing to mitigate geohazard risks. It not only enhances the efficiency of the integrity program detecting and localizing threats, it also improves and rationalizes the maintenance activities as focused surveys can be conducted.

关键词： geotechnical monitoring geohazard risk mitigation hydraulic erosion eolian erosion sand dune migration optical fiber sensors distributed temperature sensor

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temperature Measurements by Fibre Optic sensors in Power Industry

Temperature Measurements by Fibre Optic Sensors in Power Ind...

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11th International Scientific Conference on Electric Power Engineering 2010

作者： Mazanec, Michal SAFIBRA Sro Ricany 25101 Czech Republic

ISBN: (纸本)9788021440944

Measurement and diagnostic of power energy equipments are import ways how to optimize their utilizing. Fibre optic sensors are technically suitable and reliable solution, which brings many advantages. Direct transformer winding temperature measurement, temperature monitoring of power cables are described. Other sensors like mechanical strain and vibration measurements are discussed.

关键词： Fibre Optic sensor DTS distributed temperature sensor FBG Fibre Bragg Grating

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Raman sensors and their applications

Raman sensors and their applications

引用

22nd International Conference on Optical Fiber sensors (OFS)

作者： Hartog, Arthur H. Schlumberger Fiber Opt Technol Ctr Romsey SO51 9DL Hants England

distributed temperature sensors (DTS) based on Raman optical time-domain reflectometry (OTDR) are now commonly used in a wide range of industries. This paper summarises the state-of-the-art DTS systems, including rece... 详细信息

ISBN: (纸本)9780819491039

关键词： distributed temperature sensor optical time domain reflectometry Raman scattering backscatter

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A Novel DdTS Technology Based on Fiber Optics for Early Leak Detection in Pipelines 50

A Novel DdTS Technology Based on Fiber Optics for Early Leak...

引用

IEEE International Carnahan Conference on Security Technology (ICCST)

作者： Wang, Chaofan Olson, Michael Dorjkhand, Nyambuu Singh, Shailesh Senstar Inc 12 Penns TrailSTE 200 Newtown PA 18940 USA

ISBN: (纸本)9781509010721

Leaks in pipelines transporting oil, gas, or any fluid may cause enormous property and environmental damage, hence early leak detection and accurate localization are highly desirable. sensors to detect leaks can be broadly classified into internal and external sensors depending on where they are installed. In general, internal sensors have matured over decades while external sensors based on fiber optics are just beginning to show promise for early and precise leak detection. In this work, a novel technology DdTS (distributed Differential temperature sensor) is developed that can almost instantaneously detect differential temperature in the optical fiber of as little as 0.0005 C with a location accuracy of several meters. The temperature sensitivity is several orders of magnitude higher than other Brillouin or Raman based distributed temperature sensors based on fiber optics in the market. The technology utilizes standard optical fibers installed adjacent to a pipeline and can be retrofitted to a preexisting cable in most cases. In addition to detecting differential temperature, the DdTS technology also uses acoustic signatures to detect leaks, which is effective in cases where the fluid temperature closely matches that of the background soil. The DdTS technology is based on an enhanced version of Coherent Optical Time-Domain Reflectometry (C-OTDR) and can measure not only the quasi-static changes, such as temperature or strain, but also dynamic acoustic signals in the fiber. Experimental results for gas leaks from a simulated buried pipeline are discussed for different vertical and horizontal offsets, gas pressures, leak-hole sizes, and orifice acoustic signals. Experimental data simulating a liquid leak are also discussed. All experiments confirmed the theoretical capabilities of the DdTS sensor.

关键词： C-OTDR Fiber Optics sensor Oil and Gas Pipeline Leak Detection distributed temperature sensor

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A hybrid Raman/EFPI/FBG sensing system for distributed temperature and key-point pressure measurements

A hybrid Raman/EFPI/FBG sensing system for distributed tempe...

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International Conference on Optical Instruments and Technology - Optical sensors and Applications

作者： Chen, Ke Zhou, Xinlei Yang, Yang Yu, Qingxu Dalian Univ Technol Sch Phys & Optoelect Technol Dalian 116023 Liaoning Peoples R China

ISBN: (纸本)9781628418019

We demonstrate a hybrid sensing scheme, combining the incoherent optical frequency domain reflectometry (IOFDR) based Raman distributed temperature sensor (DTS) with the extrinsic Fabry-Perot interferometer (EFPI) based pressure sensor, for down-hole monitoring. The pressure measurement is compensated by a fiber Bragg grating (FBG) based temperature sensor. By using a laser diode as the common light source, a hybrid Raman/EFPI/FBG sensing system has been developed with a single fiber. The stimulated emission light and the spontaneous emission light of the laser diode are used for DTS and EFPI-FBG interrogations respectively. There can be no overlap between the spectral range of the Raman backscattered light and the spectral range of the reflected light from the EFPI-FBG sensor. distributed temperature and pressure can thus be measured by using wavelength-division multiplexing (WDM) technology. Experimental results show that, both the distributed temperature and the key-point pressure can be measured alternatively with little interference.

关键词： distributed temperature sensor Fabry-Perot interferometer fiber Bragg grating incoherent optical frequency domain reflectometry down-hole measurement

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