Experimental research on a novel optic fiber sensor based on OTDR for landslide monitoring

Zheng, Yong; Zhu, Zhengwang; Li, Wanjie; Gu, Dongming; Xiao, Wang

doi:10.1016/j.measurement.2019.106926

Cited by 35 publications

(19 citation statements)

References 30 publications

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“…The system reportedly warned of the occurrence of rockfall and a water seepageinduced collapse of the pipeline trench (as visible in Figure 57). Zheng et al [134] attempted to determine the performance of a BOTDR DOFS monitoring system for the detection of deformations induced by shear sliding on rock slopes. An initial direct-shear laboratory experiment was performed in order to investigate DOFS' monitoring effectiveness in this environment, finding a high correlation between predicted and tested results (average ratio between 0.974 to 1.081).…”

Section: Soil and Rock Deformationsmentioning

confidence: 99%

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Bado

Casas

2021

Sensors

234

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The present work is a comprehensive collection of recently published research articles on Structural Health Monitoring (SHM) campaigns performed by means of Distributed Optical Fiber Sensors (DOFS). The latter are cutting-edge strain, temperature and vibration monitoring tools with a large potential pool, namely their minimal intrusiveness, accuracy, ease of deployment and more. Its most state-of-the-art feature, though, is the ability to perform measurements with very small spatial resolutions (as small as 0.63 mm). This review article intends to introduce, inform and advise the readers on various DOFS deployment methodologies for the assessment of the residual ability of a structure to continue serving its intended purpose. By collecting in a single place these recent efforts, advancements and findings, the authors intend to contribute to the goal of collective growth towards an efficient SHM. The current work is structured in a manner that allows for the single consultation of any specific DOFS application field, i.e., laboratory experimentation, the built environment (bridges, buildings, roads, etc.), geotechnical constructions, tunnels, pipelines and wind turbines. Beforehand, a brief section was constructed around the recent progress on the study of the strain transfer mechanisms occurring in the multi-layered sensing system inherent to any DOFS deployment (different kinds of fiber claddings, coatings and bonding adhesives). Finally, a section is also dedicated to ideas and concepts for those novel DOFS applications which may very well represent the future of SHM.

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Section: Soil and Rock Deformationsmentioning

confidence: 99%

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Bado

Casas

2021

Sensors

234

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“…En las figuras 7 a, b c y d, se observa el sistema de rotación de la punta de medición que es manipulado por un motor paso a paso bipolar controlado por la tarjeta STM32 mediante cuatro (4) pines digitales y un puente H; L298N, el sistema se activa con el requerimiento de medición en el momento en que los finales de carrera de reducción de diámetro se encuentran en nivel alto. El subsistema se programó para posicionarse en los cuatro (4) puntos de medición requeridos 0°, 90°, 180° y 270°, esta funcionalidad es temporizada directamente por la rutina encargada de realizar el barrido de frecuencias del ensayo Espectroscopia de Impedancias electroquímica [14][15], que a su vez inhabilita todas las funciones de desplazamiento longitudinal.…”

Section: Sistema De Generación De Frecuencias Y Adquisición De Datosunclassified

Equipo para la verificación de conexiones soldadas de tuberías recubiertas internamente

Aperador-Chaparro

Castiblanco

2020

AiBi Revista de Investigación, Administración e Ingeniería

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El presente paper describe el diseño y la construcción de un equipo que permite la verificación de conexiones soldadas de tuberías recubiertas internamente, utilizadas en el transporte de fluidos del sector petrolero, permitiendo caracterizar las diferentes fallas que ocurren en los procesos de soldadura e instalación antes de poner en operación los sistemas de transporte, este equipo permite hacer la detección de fallas y problemas que pueden presentarse en los procesos de instalación, haciendo uso de la técnica de espectroscopia de impedancias electroquímica (EIS). El equipo cuenta con un sistema mecánico para el desplazamiento del sistema de medición a lo largo de tuberías de 6 a 12 pulgadas de diámetro. Permite detectar fallas en los recubrimientos como lo son ampollas, grietas, fisuras y quemaduras producidos principalmente por el transporte y las altas temperaturas en los procesos de soldadura. El sistema cuenta con un equipo de medición basado en la técnica de espectroscopia de impedancias (EIS) y una interfaz de usuario que permite mover el dispositivo a lo largo de la tubería, controlar el punto de medición realizando barridos en 4 puntos principales a 0°,90°,180° y 270°, almacenando los datos de medición y procesándolos en una interfaz gráfica en Matlab, el diseño de portabilidad cuenta con un sistema de comunicación Bluetooth y un cable umbilical de alimentación para energizar el sistema y hacer la conexión a tierra de la tubería. Los ensayos realizados durante el desarrollo del equipo permitieron caracterizar la impedancia de varias superficies y asociar rangos a las diferentes imperfecciones en los recubrimientos.

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“…Additionally, distributed optical fiber sensors can be applied, as they allow the monitoring of large areas with high accuracy and time frequency at a low cost. Slope movements can be detected and localized by properly anchoring the fiber to the soil either directly or through the use of geogrids/geotextiles [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Distributed Optical Fiber Sensor Applications in Geotechnical Monitoring

Minardo

Zeni

Coscetta

et al. 2021

Sensors

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We report the experimental application of distributed optical fiber sensors, based on stimulated Brillouin scattering (SBS), to the monitoring of a small-scale granular slope reconstituted in an instrumented flume and subjected to artificial rainfall until failure, and to the monitoring of a volcanic rock slope. The experiments demonstrate the sensors’ ability to reveal the sudden increase in soil strain that foreruns the failure in a debris flow phenomenon, as well as to monitor the fractures in the tuff rocks. This study offers an important perspective on the use of distributed optical fiber sensors in the setting up of early warning systems for landslides in both rock and unconsolidated materials.

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Experimental research on a novel optic fiber sensor based on OTDR for landslide monitoring

Cited by 35 publications

References 30 publications

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Equipo para la verificación de conexiones soldadas de tuberías recubiertas internamente

Distributed Optical Fiber Sensor Applications in Geotechnical Monitoring

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