Journal articles: 'Fibre Optic Sensing'

1

Orrell, Peter R. "DISTRIBUTED FIBRE OPTIC TEMPERATURE SENSING." Sensor Review 12, no. 2 (February 1992): 27–31. http://dx.doi.org/10.1108/eb007876.

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Spotts, Isaac, Dima Ismail, Noor Jaffar, and Christopher M. Collier. "Fibre-optic sensing in digital microfluidic devices." Sensors and Actuators A: Physical 280 (September 2018): 164–69. http://dx.doi.org/10.1016/j.sna.2018.07.039.

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Kirkendall, Clay K., and Anthony Dandridge. "Overview of high performance fibre-optic sensing." Journal of Physics D: Applied Physics 37, no. 18 (September 3, 2004): R197—R216. http://dx.doi.org/10.1088/0022-3727/37/18/r01.

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Walsh, J. E., K. Y. Kavanagh, S. Fennell, J. Murphy, and M. Harmey. "Fibre-optic micro-spectrometers for biomedical sensing." Transactions of the Institute of Measurement and Control 22, no. 5 (December 2000): 355–69. http://dx.doi.org/10.1177/014233120002200502.

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Amanzadeh, Moe, Saiied M. Aminossadati, Mehmet S. Kizil, and Aleksandar D. Rakić. "Recent developments in fibre optic shape sensing." Measurement 128 (November 2018): 119–37. http://dx.doi.org/10.1016/j.measurement.2018.06.034.

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Walsh, J. E., K. Y. Kavanagh, S. Fennell, J. Murphy, and M. Harmey. "Fibre-optic micro-spectrometers for biomedical sensing." Transactions of the Institute of Measurement and Control 22, no. 5 (May 1, 2000): 355–69. http://dx.doi.org/10.1191/014233100701523864.

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Thomas, Sean Dormer. "High sensitivity fibre optic vibration sensing device." Journal of the Acoustical Society of America 124, no. 1 (2008): 25. http://dx.doi.org/10.1121/1.2960791.

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Davenport, John J., Michelle Hickey, Justin P. Phillips, and Panayiotis A. Kyriacou. "Dual pO2/pCO2fibre optic sensing film." Analyst 142, no. 10 (2017): 1711–19. http://dx.doi.org/10.1039/c7an00173h.

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Murphy, V., B. D. MacCraith, T. Butler, C. McDonagh, and B. Lawless. "Quasi-distributed fibre-optic chemical sensing using telecom optical fibre." Electronics Letters 33, no. 7 (1997): 618. http://dx.doi.org/10.1049/el:19970392.

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Grattan, K. T. V. "The Use of Fibre Optic Techniques for Temperature Measurement." Measurement and Control 20, no. 6 (July 1987): 32–39. http://dx.doi.org/10.1177/002029408702000608.

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The subject area of fibre optic sensing is one in which there has been shown a very rapid expansion of interest over the last few years. Many novel techniques are appearing in the literature and some products are available to the industrial user. The background to fibre optic means of temperature sensing and some recent developments will be reviewed in this paper.

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DeMerchant, Michael, Anthony Brown, Jeff Smith, Xiaoyi Bao, and Theodore Bremner. "Distributed strain sensing for structural monitoring applications." Canadian Journal of Civil Engineering 27, no. 5 (October 1, 2000): 873–79. http://dx.doi.org/10.1139/l00-006.

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Strain sensors are a valuable tool for assessing the health of structures. The University of New Brunswick, in conjunction with ISIS Canada, is developing a distributed fibre optic strain sensor based on Brillouin scattering. This sensor can provide a virtually unlimited number of measurement points using a single optical fibre. A description of the operating principles of the system is given, along with a summary of laboratory test results. Strain measurement accuracy as high as approximately ±11 µε has been demonstrated at 1 m spatial resolution. Spatial resolutions as short as 100 mm can be used, although with decreased strain measurement accuracy. Future development of the technology will include an enhancement allowing both strain and temperature to be measured simultaneously.Key words: strain sensor, fibre optics, distributed sensing, structural monitoring, Brillouin scattering.

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Xu, Cheng, and Zahra Sharif Khodaei. "Shape Sensing with Rayleigh Backscattering Fibre Optic Sensor." Sensors 20, no. 14 (July 21, 2020): 4040. http://dx.doi.org/10.3390/s20144040.

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In this paper, Rayleigh backscattering sensors (RBS) are used to realize shape sensing of beam-like structures. Compared to conventional shape sensing systems based on fibre Bragg grating (FBG) sensors, RBS are capable of continuous lateral sensing. Compared to other types of distributed fibre optic sensors (FOS), RBS have a higher spatial resolution. First, the RBS’s strain sensing accuracy is validated by an experiment comparing it with strain gauge response. After that, two shape sensing algorithms (the coordinate transformation method (CTM) and the strain-deflection equation method (SDEM)) based on the distributed FOS’ input strain data are derived. The algorithms are then optimized according to the distributed FOS’ features, to make it applicable to complex and/or combine loading situations while maintaining high reliability in case of sensing part malfunction. Numerical simulations are carried out to validate the algorithms’ accuracy and compare their accuracy. The simulation shows that compared to the FBG-based system, the RBS system has a better performance in configuring the shape when the structure is under complex loading. Finally, a validation experiment is conducted in which the RBS-based shape sensing system is used to configure the shape of a composite cantilever-beam-like specimen under concentrated loading. The result is then compared with the optical camera-measured shape. The experimental results show that both shape sensing algorithms predict the shape with high accuracy comparable with the optical camera result.

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Makhsin, Siti Rabizah, Muhammad Izham Hakimi Mohd Zali, Rozina Abdul Rani, Nor Hayati Saad, and Muhammad Azmi Ayub. "Modifies Hummer’s Method of Graphene Oxide Nanostructures for Fibre Optic Sensors Application." Scientific Research Journal 18, no. 1 (February 28, 2021): 15. http://dx.doi.org/10.24191/srj.v18i1.11386.

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For optical fibre sensors applications, nanomaterials have been widely used to enhance sensor performance. Here, the fibre optic uses the transmission of light by total internal reflection along with the fibre and depending on the diameter of the fibre and the wavelength of the light used. Among others, graphene oxides nanostructures (GO) would offer exceptional advantages on the sensing mechanism due to 2D properties of the monocellular layer originally from graphite. The main objectives of this research are to successfully synthesis of GO using a chemical reduction method known as modifies Hummer’s method and later, deposited the GO onto the modified fibre optic layer to create a sensing platform. Prior than that, the standard plastic of fibre optic (POF) was modified by removing the cladding layer (1 cm) using a mechanical etching technique, thus the sensing platform can be created. The morphology and optical properties of the system were characterised using scanning electron microscopy (SEM) and ultraviolet-visible (UV-Vis) spectroscopy. Result of the preparation and characterisation of GO-optical fibre coatings was presented, considering its potential use for sensing applications. The stable GO was prepared by 3 hours of stirring time during the synthesis and longer dipping time was preferred to fully coat the core of the exposed POF. Aiming to explore this scheme for sensing applications, GO-coated tilted fibre will be later measuring via refractive index variations. An improvement on the sensitivity should be obtained and thus become a promising sensing platform for the development of a new line of sensors.

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Korposh, Sergiy, Stephen James, Seung-Woo Lee, and Ralph Tatam. "Tapered Optical Fibre Sensors: Current Trends and Future Perspectives." Sensors 19, no. 10 (May 17, 2019): 2294. http://dx.doi.org/10.3390/s19102294.

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The development of reliable, affordable and efficient sensors is a key step in providing tools for efficient monitoring of critical environmental parameters. This review focuses on the use of tapered optical fibres as an environmental sensing platform. Tapered fibres allow access to the evanescent wave of the propagating mode, which can be exploited to facilitate chemical sensing by spectroscopic evaluation of the medium surrounding the optical fibre, by measurement of the refractive index of the medium, or by coupling to other waveguides formed of chemically sensitive materials. In addition, the reduced diameter of the tapered section of the optical fibre can offer benefits when measuring physical parameters such as strain and temperature. A review of the basic sensing platforms implemented using tapered optical fibres and their application for development of fibre-optic physical, chemical and bio-sensors is presented.

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Fenta, Mulugeta C., David K. Potter, and János Szanyi. "Fibre Optic Methods of Prospecting: A Comprehensive and Modern Branch of Geophysics." Surveys in Geophysics 42, no. 3 (March 9, 2021): 551–84. http://dx.doi.org/10.1007/s10712-021-09634-8.

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AbstractOver the past decades, the development of fibre optic cables, which pass light waves carrying data guided by total internal reflection, has led to advances in high-speed and long-distance communication, large data transmission, optical imaging, and sensing applications. Thus far, fibre optic sensors (FOSs) have primarily been employed in engineering, biomedicine, and basic sciences, with few reports of their usage in geophysics as point and distributed sensors. This work aimed at reviewing the studies on the use of FOSs in geophysical applications with their fundamental principles and technological improvements. FOSs based on Rayleigh, Brillouin, and Raman scatterings and fibre Bragg grating sensors are reviewed based on their sensing performance comprising sensing range, spatial resolution, and measurement parameters. The recent progress in applying distributed FOSs to detect acoustic, temperature, pressure, and strain changes, as either single or multiple parameters simultaneously on surface and borehole survey environments with their cable deployment techniques, has been systematically reviewed. Despite the development of fibre optic sensor technology and corresponding experimental reports of applications in geophysics, there have not been attempts to summarise and synthesise fibre optic methods for prospecting as a comprehensive and modern branch of geophysics. Therefore, this paper outlines the fibre optic prospecting methods, with an emphasis on their advantages, as a guide for the geophysical community. The potential of the new outlined fibre optic prospecting methods to revolutionise conventional geophysical approaches is discussed. Finally, the future challenges and limitations of the new prospecting methods for geophysical applications are elucidated.

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Szajman, Jakub, Frank Di Marzio, and Michael Podlesak. "Fibre Optic Shock Velocity Sensor for Solids." Australian Journal of Physics 52, no. 1 (1999): 27. http://dx.doi.org/10.1071/p98068.

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This paper reports a fibre optic sensing technique for the measurement of shock velocity in solid materials. The shock-induced changes in the light transmission properties of an optical fibre are employed as the principal transduction mechanism. A polycarbonate flyer plate generated shock waves by impacting a perspex target. The shock velocity was determined from the difference in arrival times of the shock front at the spatially separated optical fibres embedded in the target. The main advantage of this sensor system lies in its simplicity and immunity to optical and radio frequency (RF) noise. Consideration is also given to the effect of release waves on the uniform shock pressure region generated by the ˚yer impact which can degrade the accuracy of the velocity measurement.

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Penwill, L. A., J. H. Slater, N. W. Hayes, and C. J. Tremlett. "Fibre optic system for biochemical and microbiological sensing." Journal of Physics: Conference Series 76 (July 1, 2007): 012053. http://dx.doi.org/10.1088/1742-6596/76/1/012053.

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Grant-Jacob, James A., Saurabh Jain, Yunhui Xie, Benita S. Mackay, Michael D. T. McDonnell, Matthew Praeger, Matthew Loxham, David J. Richardson, Robert W. Eason, and Ben Mills. "Fibre-optic based particle sensing via deep learning." Journal of Physics: Photonics 1, no. 4 (September 30, 2019): 044004. http://dx.doi.org/10.1088/2515-7647/ab437b.

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Williams, B. A., and R. J. Dewhurst. "Differential fibre-optic sensing of laser-generated ultrasound." Electronics Letters 31, no. 5 (March 2, 1995): 391–92. http://dx.doi.org/10.1049/el:19950235.

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Henderson, Philip J. "Advanced materials and techniques for fibre-optic sensing." IOP Conference Series: Materials Science and Engineering 60 (June 17, 2014): 012072. http://dx.doi.org/10.1088/1757-899x/60/1/012072.

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Gauthier, R. C., and M. Boudreau. "Fibre-optic digital single point temperature sensing element." Optics & Laser Technology 23, no. 6 (December 1991): 357–60. http://dx.doi.org/10.1016/0030-3992(91)90075-y.

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Ecke, W., W. Haubenreisser, H. Lehmann, S. Schroeter, G. Schwotzer, and R. Willsch. "Phase-sensitive fibre-optic monoptodes for chemical sensing." Sensors and Actuators B: Chemical 11, no. 1-3 (March 1993): 475–79. http://dx.doi.org/10.1016/0925-4005(93)85290-q.

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Schilperoort, R. P. S., and F. H. L. R. Clemens. "Fibre-optic distributed temperature sensing in combined sewer systems." Water Science and Technology 60, no. 5 (May 1, 2009): 1127–34. http://dx.doi.org/10.2166/wst.2009.467.

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This paper introduces the application of fibre-optic distributed temperature sensing (DTS) in combined sewer systems. The DTS-technique uses a fibre-optic cable that is inserted into a combined sewer system in combination with a laser instrument that performs measurements and logs the data. The DTS-technique allows monitoring in-sewer temperatures with dense spatial and temporal resolutions. The installation of a fibre-optic cable in a combined sewer system has proven feasible. The use of a single instrument in an easy accessible and safe location that can simultaneously monitor up to several hundreds of monitoring locations makes the DTS set-up easy in use and nearly free of maintenance. Temperature data from a one-week monitoring campaign in an 1,850 m combined sewer system shows the level of detail with which in-sewer processes that affect wastewater temperatures can be studied. Individual discharges from house-connections can be tracked in time and space. With a dedicated cable configuration the confluence of wastewater flows can be observed with a potential to derive the relative contributions of contributary flows to a total flow. Also, the inflow and in-sewer propagation of stormwater can be monitored.

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Lu, Xin, Peter James Thomas, and Jon Oddvar Hellevang. "A Review of Methods for Fibre-Optic Distributed Chemical Sensing." Sensors 19, no. 13 (June 28, 2019): 2876. http://dx.doi.org/10.3390/s19132876.

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Chemical sensing is of great importance in many application fields, such as medicine, environmental monitoring, and industrial process control. Distributed fibre-optic sensing received significant attention because of its unique feature to make spatially resolved measurements along the entire fibre. Distributed chemical sensing (DCS) is the combination of these two techniques and offers potential solutions to real-world applications that require spatially dense chemical measurements covering large length scales. This paper presents a review of the working principles, current status, and the emerging trends within DCS.

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Jacobsz, Schalk Willem, and Sebastian Ingo Jahnke. "Leak detection on water pipelines in unsaturated ground by discrete fibre optic sensing." Structural Health Monitoring 19, no. 4 (October 18, 2019): 1219–36. http://dx.doi.org/10.1177/1475921719881979.

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The article describes a study using discrete fibre optic sensing as a means of leak detection on water distribution pipes installed in unsaturated ground. A short length of pipe fitted with artificial leak points was installed, to which a fibre optic cable with fibre Bragg gratings was attached. An optical fibre with fibre Bragg gratings was also installed in the ground parallel to but separate from the pipe. Thermistors were installed at selected locations to measure temperature changes independent of strain. It was found that a simulated water leak resulted in clearly detectable temperature changes and thermally induced fibre Bragg grating wavelength changes in the ground around the pipe. However, significantly larger deformation-induced fibre Bragg grating wavelength changes were measured on the pipe walls and also in the initially unsaturated ground in response to leaks. A wetting front originating from a water leak propagating through unsaturated soil is associated with significant effective stress changes because the infiltrating water alters the ambient matric suction in the soil. This effective stress change is associated with significant ground deformation resulting in a fibre Bragg grating response which significantly exceeds the thermal response associated with (usually) colder water leaking into unsaturated soil. The study illustrates advantages of measuring ground deformation-induced fibre Bragg grating wavelength changes over pure temperature changes as an efficient means of leak detection in unsaturated ground. However, due to the limited number of fibre Bragg gratings that can be monitored along a single optical fibre, a leak detection system suitable for practical implementation should be based on distributed fibre optic strain sensing, an aspect requiring further research.

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Munster, Petr, Tomas Horvath, and Josef Vojtech. "Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection." Sensors 19, no. 8 (April 16, 2019): 1810. http://dx.doi.org/10.3390/s19081810.

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Fibre optic infrastructures are very important, and therefore, it is necessary to protect them from fibre cuts. Most fibre cuts are caused by digging activity, and many network operators seek appropriate solutions enabling detection of possible unexpected events (predict these cuts) and subsequent network outages. In most cases, there is no need to locate events, and only information regarding the occurrence of the event is sufficient. Direct detection-based distributed fibre optic sensing systems appear to be an appropriate solution, allowing digging to be detected before the fibre breaks. The average power of such signals is relatively small, and there is no interference with other signals in the fibre. We performed laboratory measurements to compare the sensitivity and accuracy of interferometric and polarization systems for acoustic vibrations. In the case of interferometric systems, the reference and sensing arms were in the same cable, and both were subjected to acoustic vibrations.

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Han, Young-Geun, Byeong Ha Lee, Won-Taek Han, Un-Chul Paek, and Youngjoo Chung. "Fibre-optic sensing applications of a pair of long-period fibre gratings." Measurement Science and Technology 12, no. 7 (June 8, 2001): 778–81. http://dx.doi.org/10.1088/0957-0233/12/7/304.

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Malins, C., M. Landl, P. Šimon, and B. D. MacCraith. "Fibre optic ammonia sensing employing novel near infrared dyes." Sensors and Actuators B: Chemical 51, no. 1-3 (August 1998): 359–67. http://dx.doi.org/10.1016/s0925-4005(98)00223-8.

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Rolfe, Peter, Fabio Scopesi, and Giovanni Serra. "Advances in fibre-optic sensing in medicine and biology." Measurement Science and Technology 18, no. 6 (May 8, 2007): 1683–88. http://dx.doi.org/10.1088/0957-0233/18/6/s03.

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Barnard, Steven M., and David R. Walt. "A fibre-optic chemical sensor with discrete sensing sites." Nature 353, no. 6342 (September 1991): 338–40. http://dx.doi.org/10.1038/353338a0.

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Buchmayer, Fabian, Christoph Martin Monsberger, and Werner Lienhart. "Advantages of tunnel monitoring using distributed fibre optic sensing." Journal of Applied Geodesy 15, no. 1 (January 27, 2021): 1–12. http://dx.doi.org/10.1515/jag-2019-0065.

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AbstractPredictive maintenance and safety assessment during the construction and operational phase are becoming more and more important in modern tunnelling. However, traditional measurement methods are often time-consuming, expensive and partially require an interruption of the tunnel traffic. In this article, we present a tunnel monitoring approach based on distributed fibre optic sensing (DFOS), which delivers hundreds of strain and temperature sensing points inside the structure and gives completely new information about the behaviour of the tunnel lining. Measurements can be performed automatically without the need of access to the tunnel and hence, monitoring can be made without disturbing the tunnel construction or operation. The developed system was installed within the shotcrete tunnel lining of a railway tunnel under construction in Austria. In addition to the critical installation process, this article discusses the main monitoring results and compares them to conventional measurements.

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Kharaz, A., and B. Jones. "A Distributed Fibre Optic Sensing System for Humidity Measurement." Measurement and Control 28, no. 4 (May 1995): 101–3. http://dx.doi.org/10.1177/002029409502800402.

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Dean, T., T. Cuny, A. Constantinou, P. Dickenson, and E. Hamouche. "Depth calibration of fibre-optic distributed vibration sensing measurements." First Break 36, no. 3 (March 1, 2018): 29–34. http://dx.doi.org/10.3997/1365-2397.2017025.

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de Oliveira, Rui, Orlando Frazão, José L. Santos, and António Torres Marques. "Development of an Optic Fibre Sensor System for Acoustic Emission Sensing in FRP." Materials Science Forum 514-516 (May 2006): 794–98. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.794.

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In this study an optic fibre system for health monitoring of fibre reinforced plastics was developed. It is based on the detection of acoustic emission (AE) waves in a loaded material. A low-finesse Fabry-Pérot interferometer sensor is used as alternative to the conventional piezoelectric transducers for AE waves sensing. An original procedure for optical fibre sensor interrogation is proposed.

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Bednarz, Bartosz, Paweł Popielski, Rafał Sieńko, Tomasz Howiacki, and Łukasz Bednarski. "Distributed Fibre Optic Sensing (DFOS) for Deformation Assessment of Composite Collectors and Pipelines." Sensors 21, no. 17 (September 2, 2021): 5904. http://dx.doi.org/10.3390/s21175904.

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Due to the low costs of distributed optical fibre sensors (DFOS) and the possibility of their direct integration within layered composite members, DFOS technology has considerable potential in structural health monitoring of linear underground infrastructures. Often, it is challenging to truly simulate the actual ground conditions at all construction stages. Thus, reliable measurements are required to adjust the model and verify theoretical calculations. The article presents a new approach to monitor displacements and strains in Glass Fiber Reinforced Polymer (GFRP) collectors and pipelines using DFOS. The research verifies the effectiveness of the proposed monitoring solution for health monitoring of composite pipelines. Optical fibres were installed over the circumference of a composite tubular pipe, both on the internal and external surfaces, while loaded externally. Analysis of strain profiles allowed for calculating the actual displacements (shape) of the pipe within its cross-section plane using the Trapezoidal method. The accuracy of proposed approach was positively verified both with reference spot displacement transducer as well as numerical simulations using finite element method (FEM). DFOS could obtain a comprehensive view of structural deformations, including both strains and displacements under externally applied load. The knowledge gained during research will be ultimately used for renovating existing collectors.

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Schröder, Kerstin, Manfred Rothhardt, Wolfgang Ecke, Uwe Richter, André Sonntag, and Hartmut Bartelt. "Fibre optic sensing system for monitoring of current collectors and overhead contact lines of railways." Journal of Sensors and Sensor Systems 6, no. 1 (February 6, 2017): 77–85. http://dx.doi.org/10.5194/jsss-6-77-2017.

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Abstract. Fibre optic sensors are excellent tools to use for monitoring high-voltage current collectors. Because of their small cross section and electrical neutrality, they are easily integrated into the current collector strip and are well specialized for detection of high-speed load events. The conventional contact force measurement with four force sensors below the collector strips can also be simplified by using fibre optic force and acceleration sensors.

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Rajeev, Pathmanathan, Jayantha Kodikara, Wing Kong Chiu, and Thomas Kuen. "Distributed Optical Fibre Sensors and their Applications in Pipeline Monitoring." Key Engineering Materials 558 (June 2013): 424–34. http://dx.doi.org/10.4028/www.scientific.net/kem.558.424.

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Health monitoring of civil infrastructure systems has recently emerged as a powerful tool for condition assessment of infrastructure performance. With the widespread use of modern telecommunication technologies, structures could be monitored periodically from a central station located several kilometres away from the field. This remote capability allows immediate damage detection, so that necessary actions are taken to reduce the risk. Optical fiber sensors offer a relatively new technology for monitoring the performance of spatially distributed structures such as pipelines. In this regards, several commercially available strain and temperature sensing equipment such as discrete FBGs (Fibre Bragg Gratings) and fully distributed sensing techniques such as Raman DTS (distributed temperature sensor) and Brillouin Optical Time Domain Reflectometry (BOTDR) typically offer sensing lengths of the order of 100 km's. Distributed fiber optic sensing offers the ability to measure temperatures and/or strains at thousands of points along a single fiber. In this paper, the authors will give a brief overview of these optical fiber technologies, outline potential applications of these technologies for geotechnical engineering applications and experience in utilising BOTDR in water pipeline monitoring application.

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Johnstone, W., K. McCallion, M. S. Gill, G. Thursby, D. Moodie, and G. Fawcett. "In line fibre optic electric field sensing technique without interruption of the fibre." IEE Proceedings - Science, Measurement and Technology 142, no. 2 (March 1, 1995): 109–13. http://dx.doi.org/10.1049/ip-smt:19951451.

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Shahnia, Soroush, Heike Ebendorff-Heidepriem, Drew Evans, and Shahraam Afshar. "A Fibre-Optic Platform for Sensing Nitrate Using Conducting Polymers." Sensors 21, no. 1 (December 28, 2020): 138. http://dx.doi.org/10.3390/s21010138.

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Monitoring nitrate ions is essential in agriculture, food industry, health sector and aquatic ecosystem. We show that a conducting polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), can be used for nitrate sensing through a process in which nitrate ion uptake leads to oxidation of PEDOT and change of its optical properties. In this study, a new platform is developed in which a single-mode fibre coated at the tip with PEDOT is used for nitrate sensing. A crucial step towards this goal is introduction of carbonate exposure to chemically reduced PEDOT to a baseline value. The proposed platform exhibits the change in optical behaviour of the PEDOT layer at the tip of the fibre as it undergoes chemical oxidation and reduction (redox). The change in optical properties due to redox switching varies with the intensity of light back reflected by the fibre coated with PEDOT. The proposed platform during oxidation demonstrates linear response for the uptake of nitrate ions in concentrations ranging between 0.2 and 40 parts per million (ppm), with a regression coefficient R2=0.97 and a detection limit of 6.7 ppm. The procedure for redox switching is repeatable as the back reflection light intensity reaches ±1.5% of the initial value after reduction.

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Sirat, Qurratu Aini, Dayangku Salma Awang Ismail, Azman Kassim, and Ahmad Safuan A. Rashid. "Application of distributed optical fibre for shallow foundation." MATEC Web of Conferences 250 (2018): 01019. http://dx.doi.org/10.1051/matecconf/201825001019.

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Soil deformation is one of the major interests with regard to the stability analysis of the foundations. The deformations are signified for both vertical and lateral soil deformation; which the former plays vital role in designing a good foundation. As the stability of the foundation affect the stability of the entire structure, instrumentation and monitoring play an important roles in order to monitor the performances of the geotechnical structures. Until now the design of a foundation soil system is relied on the quantification of soil bearing capacity and foundation structural capacity and then followed by conventional monitoring system to observe the settlement so that within the allowable values. Therefore, this study focuses on the newly usage of distributed optical fibre sensing application to monitor strain distribution within a soil mass due to surcharge loading. It is expected to observe the strain distribution goes proportionally to vertical stress distribution concept; where higher strain measurement right below the loading position and decreases with depth. The advantage of distributed optical fibre sensing rather than conventional strain gauge is the sensor able to collect so-called average strain along the optical fibre compare to discrete measurement of strain gauge. This paper describes the experimental work conducted with the use of a distributed sensing technology named Brillouin Optical Time-Domain Analysis (BOTDA). A small scale of 1G model of a shallow foundation which represented by a load plate under incremental surcharge loading was stimulated to assess the soil mass deformation. The optical fibre were embedded in soil mass by layering in a horizontal direction which laid perpendicular to load direction. A comparison of numerical modeling using PLAXIS 2D and experimental works as part of this study. As a results, fibre optic is a good approach for instrumentations and monitoring for geotechnical structures as fibre optics is sensitive to the movement of the soil and fibre optic with anchorage system gave better strain measurement reading compare to without anchorage system.

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Rui, Yi, Cedric Kechavarzi, Frank O’Leary, Chris Barker, Duncan Nicholson, and Kenichi Soga. "Integrity Testing of Pile Cover Using Distributed Fibre Optic Sensing." Sensors 17, no. 12 (December 19, 2017): 2949. http://dx.doi.org/10.3390/s17122949.

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Epstein, Jason R., and David R. Walt. "Fluorescence-based fibre optic arrays: a universal platform for sensing." Chemical Society Reviews 32, no. 4 (2003): 203. http://dx.doi.org/10.1039/b300617d.

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Farahi, F., T. P. Newson, J. D. C. Jones, and D. A. Jackson. "Coherence multiplexing of remote fibre optic fabry-perot sensing system." Optics Communications 65, no. 5 (March 1988): 319–21. http://dx.doi.org/10.1016/0030-4018(88)90094-6.

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Wade, S. A., D. I. Forsyth, Q. Guofu, X. Chen, T. S. Chuan, W. Yong, T. Sun, and K. T. V. Grattan. "Dual Measurement of Strain and Temperature Using the Combination of Er3+ -Doped Fibre Fluorescence Lifetime and a Fibre Bragg Grating." Measurement and Control 34, no. 6 (July 2001): 175–78. http://dx.doi.org/10.1177/002029400103400606.

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Fibre optic sensing devices have been produced for the dual measurement of strain and temperature using the combined properties of fibre Bragg gratings and the fluorescence lifetime of erbium-doped fibre. Two different sensors were constructed with the fibre Bragg grating written in normal fibre and also written directly in the Er3+-doped fibre. Results obtained indicate that this technique can be used to measure strains and temperatures with accuracies of approximately 1.2°C and 20.4 με

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Gangopadhyay, Tarun Kumar. "Prospects for Fibre Bragg Gratings and Fabry-Perot Interferometers in fibre-optic vibration sensing." Sensors and Actuators A: Physical 113, no. 1 (June 2004): 20–38. http://dx.doi.org/10.1016/j.sna.2004.01.043.

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Shi, He, Jinzhe Gong, Peter R. Cook, John W. Arkwright, Gretel M. Png, Martin F. Lambert, Aaron C. Zecchin, and Angus R. Simpson. "Wave separation and pipeline condition assessment using in-pipe fibre optic pressure sensors." Journal of Hydroinformatics 21, no. 2 (February 12, 2019): 371–79. http://dx.doi.org/10.2166/hydro.2019.051.

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Abstract The use of two pressure transducers in close proximity can enable the separation of the directional travelling pressure waves in pipelines. However, the implementation of this measurement strategy in real water pipes is difficult due to the lack of closely located access points. This paper reports the use of a customised in-pipe fibre optic pressure sensor array for hydraulic transient wave separation and pipeline condition assessment. The fibre optic pressure sensor array can be inserted into a pressurised pipeline through a single access point. The array consists of multiple fibre Bragg grating (FBG)-based pressure sensors in close proximity (∼0.5 m apart). A previously developed wave separation algorithm is adapted to analyse the transient pressure measurement from the FBG sensors. The resultant directional pressure waves are then used to detect pipe sections with a thinner wall thickness. A challenge is the influence of the in-pipe fibre optic sensing cable on the transient pressure measurement. The impact is analysed and adjustments to the pipeline condition assessment algorithm are undertaken to resolve the issue. The successful experimental application verifies the usefulness of the in-pipe fibre optic sensor array, which can facilitate transient-based pipeline condition assessment for buried water pipes with limited access points.

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Bartelmess, Juergen, David Zimmek, Matthias Bartholmai, Christoph Strangfeld, and Michael Schäferling. "Fibre optic ratiometric fluorescence pH sensor for monitoring corrosion in concrete." Analyst 145, no. 6 (2020): 2111–17. http://dx.doi.org/10.1039/c9an02348h.

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Farahi, F., J. D. C. Jones, and D. A. Jackson. "Multiplexed fibre-optic interferometric sensing system: combined frequency and time division." Electronics Letters 24, no. 7 (1988): 409. http://dx.doi.org/10.1049/el:19880277.

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Hurtig, E., S. Groβwig, and K. Kühn. "Fibre optic temperature sensing: application for subsurface and ground temperature measurements." Tectonophysics 257, no. 1 (May 1996): 101–9. http://dx.doi.org/10.1016/0040-1951(95)00124-7.

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Tanaka, S., and Y. Ohtsuka. "Fibre optic spectral polarimetry for sensing multiple stress-loaded locations along a length of fibre." IEE Proceedings - Optoelectronics 144, no. 3 (1997): 176. http://dx.doi.org/10.1049/ip-opt:19971185.

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Journal articles on the topic 'Fibre Optic Sensing'

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