Power cable fault management with fiber optic distributed sensors: future technological trends

1998 ◽  
Author(s):  
Stephane R. Teral ◽  
Marcos Kleinerman ◽  
Patrice Malavielle
Keyword(s):  
Fiber Optic ◽  
Fault Management ◽  
Power Cable ◽  
Distributed Sensors

Distributed Fiber-Optic Ultrasonic Sensor Applied in Detection of Discharging Fault of Power Cable Joint

2021 ◽  
Vol 41 (3) ◽  
pp. 0306001
Author(s):  
陈浩 Chen Hao ◽  
徐阳 Xu Yang ◽  
钱森 Qian Sen ◽  
陈川 Chen Chuan ◽  
郭经红 Guo Jinghong ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Ultrasonic Sensor ◽  
Power Cable

J0450304 Study on debonding detection for adhesive bonded single-lap joints by fiber-optic distributed sensors

2014 ◽  
Vol 2014 (0) ◽  
pp. _J0450304--_J0450304-
Author(s):  
Tetsuo TAMAOKI ◽  
Xiaoguang NING ◽  
Daichi WADA ◽  
Hideaki MURAYAMA ◽  
Kazuro KAGEYAMA ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Lap Joints ◽  
Distributed Sensors ◽  
Single Lap Joints ◽  
Debonding Detection

Distributed Fiber Optic Strain Sensing with Embedded Small-Diameter Optical Fibers in CFRP Laminate

2007 ◽  
Vol 334-335 ◽  
pp. 1013-1016
Author(s):  
Tadahito Mizutani ◽  
Takafumi Nishi ◽  
Nobuo Takeda
Keyword(s):  
Spatial Resolution ◽  
Optical Fibers ◽  
Composite Structures ◽  
Fiber Optic ◽  
Current Trend ◽  
Small Diameter ◽  
Long Distance ◽  
Distributed Sensors ◽  
Cfrp Laminate ◽  
Sensing Applications

Although demand for composite structures rapidly increase due to the advantages in weight, there are few effective assessment techniques to enable the quality control and guarantee the durability. In particular, an invisible microscopic damage detection technology is highly required because damages such as transverse cracks, debondings, or delaminations can lead to the critical failure of the structures. Among many non-destructive evaluation (NDE) methods for composite structures, fiber optic sensors are especially attractive due to the high sensitivity, the lightweight, and the small size. In the current trend of the structural health monitoring technology, fiber Bragg gratings (FBG) sensors are frequently used as strain or temperature sensors, and Brillouin scattering sensors are also often used for a long distance distributed measurement. The Brillouin distributed sensors can measure strain over a distance of 10km while a spatial resolution was limited to 1m. Some novel sensing method is proposed to improve the spatial resolution. The pulse-prepump Brillouin optical time domain analysis (PPP-BOTDA) is one of the latest distributed sensing applications with a cm-order high spatial resolution. The PPP-BOTDA commercial product has the spatial resolution of 10cm, and can measure the strain with a precision of ±25og. This precision, however, can be achieved by using conventional single-mode optical fibers. In our research, small-diameter optical fibers with a cladding diameter of 40om were embedded in the CFRP laminate to avoid the deterioration of the CFRP mechanical properties. Thus, in order to verify the performance of PPP-BOTDA, the distributed strain measurement was conducted with the small-diameter optical fibers embedded in the CFRP laminate.

scholarly journals Measuring Three-Dimensional Temperature Distributions in Steel–Concrete Composite Slabs Subjected to Fire Using Distributed Fiber Optic Sensors

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5518
Author(s):  
Yi Bao ◽  
Matthew S. Hoehler ◽  
Christopher M. Smith ◽  
Matthew Bundy ◽  
Genda Chen
Keyword(s):  
Fiber Optic ◽  
Three Dimensional ◽  
Thermal Response ◽  
Point Clouds ◽  
Fiber Optic Sensors ◽  
Distributed Sensors ◽  
Temperature Distributions ◽  
Composite Slabs ◽  
Spatially Distributed ◽  
Dense Point

Detailed information about temperature distribution can be important to understand structural behavior in fire. This study develops a method to image three-dimensional temperature distributions in steel–concrete composite slabs using distributed fiber optic sensors. The feasibility of the method is explored using six 1.2 m × 0.9 m steel–concrete composite slabs instrumented with distributed sensors and thermocouples subjected to fire for over 3 h. Dense point clouds of temperature in the slabs were measured using the distributed sensors. The results show that the distributed sensors operated at material temperatures up to 960 °C with acceptable accuracy for many structural fire applications. The measured non-uniform temperature distributions indicate a spatially distributed thermal response in steel–concrete composite slabs, which can only be adequately captured using approaches that provide a high density of through-depth data points.

Kilometer-Long Optical Fiber Sensor for Real-Time Railroad Infrastructure Monitoring to Ensure Safe Train Operation

2015 ◽  
Author(s):  
Yi Bao ◽  
Genda Chen ◽  
Weina Meng ◽  
Fujian Tang ◽  
Yizheng Chen
Keyword(s):  
Real Time ◽  
Spatial Resolution ◽  
Strain Distribution ◽  
Fiber Optic ◽  
Gage Length ◽  
Fiber Optic Sensor ◽  
Sensor Deployment ◽  
Small Scale ◽  
Distributed Sensors ◽  
Optic Sensor

This study is aimed to develop a real-time safety monitoring of kilometer-long joint rails using a distributed fiber optic sensor. The sensor measures the distribution of Brillouin frequency shift along its length with pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA). The measurement distance and spatial resolution can be up to 25 km and 2 cm, respectively. The fiber optic sensor was first characterized and calibrated for distributed strain and temperature measurement, and then instrumented on a small-scale joint rail-like specimen in laboratory. The specimen was loaded at room temperature, and its strain distribution along the sensor was measured using a Neubrescope with high accuracy and spatial resolution. Given a gage length, the joint open change was determined and visibly identified from the measured strain distribution. Finally, an implementation plan of distributed sensors on a railway is introduced, including sensor deployment, sensor repair when broken, and cost analysis. The gage length at a crack is an important parameter in sensor deployment and investigated using finite element analysis. The results indicate that the distributed sensor can be used successfully to monitor the strain and temperature distributions in joint rails.

scholarly journals Cabled Ocean Observatory Systems

2004 ◽  
Vol 38 (2) ◽  
pp. 30-43 ◽  
Author(s):  
Alan D. Chave ◽  
Gary Waterworth ◽  
Andrew R. Maffei ◽  
Gene Massion
Keyword(s):  
Fiber Optic ◽  
High Reliability ◽  
Power Grid ◽  
System Engineering ◽  
Power Cable ◽  
Future Studies ◽  
Control Instrument ◽  
Engineering Environment ◽  
And Control

Future studies of episodic processes in the ocean and earth will require new tools to complement traditional, ship-based, expeditionary science. This will be enabled through the construction of innovative facilities called ocean observatories which provide unprecedented amounts of power and two-way bandwidth to access and control instrument networks in the oceans. The most capable ocean observatories are designed around a submarine fiber optic/power cable connecting one or more seafloor science nodes to the terrestrial power grid and communications backhaul. This paper defines the top level requirements that drive cabled observatory design and the system engineering environment within which a scientifically-capable infrastructure can be implemented. Commercial high reliability submarine telecommunication technologies which will be crucial in the design of long term cabled observatories are then reviewed. The top level architecture of a generic cabled observatory, describing the main subsystems comprising the whole and defining technological approaches to their engineering, is then described, along with some example design choices and tradeoff studies

scholarly journals Review of Fiber Optic Sensors for Structural Fire Engineering

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 877 ◽  
Author(s):  
Yi Bao ◽  
Ying Huang ◽  
Matthew Hoehler ◽  
Genda Chen
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Distributed Sensors ◽  
Structural Fire ◽  
Fire Engineering ◽  
Key Characteristics ◽  
Light Signals ◽  
Structural Engineers ◽  
Structural Fire Engineering

Reliable and accurate measurements of temperature and strain in structures subjected to fire can be difficult to obtain using traditional sensing technologies based on electrical signals. Fiber optic sensors, which are based on light signals, solve many of the problems of monitoring structures in high temperature environments; however, they present their own challenges. This paper, which is intended for structural engineers new to fiber optic sensors, reviews various fiber optic sensors that have been used to make measurements in structure fires, including the sensing principles, fabrication, key characteristics, and recently-reported applications. Three categories of fiber optic sensors are reviewed: Grating-based sensors, interferometer sensors, and distributed sensors.

Sign in / Sign up

Export Citation Format

Share Document