scholarly journals Biocompatible and Sustainable Optical Strain Sensors for Large-Area Applications

2016 ◽  
Vol 4 (12) ◽  
pp. 1950-1954 ◽  
Author(s):  
Gen Kamita ◽  
Bruno Frka-Petesic ◽  
Antoine Allard ◽  
Marielle Dargaud ◽  
Katie King ◽  
...  
Keyword(s):  
Strain Sensors ◽  
Large Area ◽  
Optical Strain

scholarly journals Large area and ultra-thin compliant strain sensors for prosthetic devices

2017 ◽  
Vol 266 ◽  
pp. 56-64 ◽  
Author(s):  
Vitor Sencadas ◽  
Rahim Mutlu ◽  
Gursel Alici
Keyword(s):  
Strain Sensors ◽  
Large Area ◽  
Prosthetic Devices

scholarly journals Evaluation of Strain Transition Properties between Cast-In Fibre Bragg Gratings and Cast Aluminium during Uniaxial Straining

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6276
Author(s):  
Florian Heilmeier ◽  
Robert Koos ◽  
Michael Singer ◽  
Constantin Bauer ◽  
Peter Hornberger ◽  
...  
Keyword(s):  
Bragg Gratings ◽  
Tensile Specimen ◽  
Strain Sensors ◽  
Fe Model ◽  
Plastic Strains ◽  
Closing The Gap ◽  
Optical Strain ◽  
Structural Parts ◽  
Fibre Bragg Gratings

Current testing methods are capable of measuring strain near the surface on structural parts, for example by using strain gauges. However, stress peaks often occur within the material and can only be approximated. An alternative strain measurement incorporates fibre-optical strain sensors (Fiber Bragg Gratings, FBG) which are able to determine strains within the material. The principle has already been verified by using embedded FBGs in tensile specimens. The transition area between fibre and aluminium, however, is not yet properly investigated. Therefore, strains in tensile specimens containing FBGs were measured by neutron diffraction in gauge volumes of two different sizes around the Bragg grating. As a result, it is possible to identify and decouple elastic and plastic strains affecting the FBGs and to transfer the findings into a fully descriptive FE-model of the strain transition area.We thus accomplished closing the gap between the external load and internal straining obtained from cast-in FBG and generating valuable information about the mechanisms within the strain transition area.It was found that the porosity within the casting has a significant impact on the stiffness of the tensile specimen, the generation of excess microscopic tensions and thus the formation of permanent plastic strains, which are well recognized by the FBG. The knowledge that FBG as internal strain sensors function just as well as common external strain sensors will now allow for the application of FBG in actual structural parts and measurements under real load conditions. In the future, applications for long-term monitoring of cast parts will also be enabled and are currently under development.

Monitoring Stress/Strain in Buried Pipelines Through the Use of Fiber Bragg Grating Sensors

2015 ◽  
Author(s):  
Juan David Betancur Ríos ◽  
Camilo Eliécer Torres ◽  
Jaime Hernan Aristizabal ◽  
Adriana Galvis ◽  
Ronald Andrés Díaz ◽  
...  
Keyword(s):  
Strain Sensors ◽  
Strong Impact ◽  
Buried Pipelines ◽  
Stress Strain ◽  
Fiber Bragg Grating Sensors ◽  
Pipeline Program ◽  
Integrity Management ◽  
Optical Strain ◽  
External Forces ◽  
Rain Precipitation

ECOPETROL S.A. has been working since 2006 in Pipeline Integrity Management Process. In that process, the threat related to climate and external forces play an important role, because of the vulnerability of ECOPETROL pipelines to this threat, not only by the geomorphology of Colombia, but also because of the strong impact of climate phenomenon such as “La Niña”, that consists in an unusual quantity of rain precipitation, represented in the increasing of slopes instability that affects the rights of way. Due to these events and the evolution of optical strain sensors monitoring technology, ECOPETROL has introduced an instrumentation pipeline program for monitoring the strain and advanced in the understanding of the behavior of pipelines. This paper describes the technology selected, the criteria used to select the monitoring sites and the thresholds stress/strain. The results of monitoring are discussed for a particular case.

Vibration control of shell-like structures with optical strain sensors

2014 ◽  
Author(s):  
Simone Cinquemani ◽  
Gabriele Cazzulani ◽  
Francesco Braghin
Keyword(s):  
Vibration Control ◽  
Strain Sensors ◽  
Optical Strain

A Helping Hand: Soft Orthosis with Integrated Optical Strain Sensors and EMG Control

2016 ◽  
Vol 23 (3) ◽  
pp. 55-64 ◽  
Author(s):  
Huichan Zhao ◽  
Jonathan Jalving ◽  
Rukang Huang ◽  
Ross Knepper ◽  
Andy Ruina ◽  
...  
Keyword(s):  
Strain Sensors ◽  
Emg Control ◽  
Integrated Optical ◽  
Optical Strain

Static and Dynamic Strain Measurements using Sensing Sheets for Damage Detection

2019 ◽  
Author(s):  
Vivek Kumar ◽  
Levent E. Aygun ◽  
Naveen Verma ◽  
James C. Sturm ◽  
Branko Glisic
Keyword(s):  
Damage Detection ◽  
Measurement Errors ◽  
Real Life ◽  
Anomalous Behavior ◽  
Strain Sensors ◽  
Dynamic Strain ◽  
Large Area ◽  
Direct Sensing ◽  
Aluminum Beam ◽  
Real Life Condition

<p>Damage detection in structures is an important part of structural health monitoring (SHM). Two approaches for detecting damages are indirect and direct sensing. Indirect sensing uses sparse array of sensors and complex algorithms to determine the extent and localization of damage. Crack initiation can best be captured with direct sensing as it provides resolved information about the anomalous behavior near cracks. Direct sensing, however, is expensive because of the need to install a large array of densely packed sensors. A novel solution developed recently is the use of two-dimensional sensing sheets designed to cover large areas of structures. Such sheets are based on large area electronics (LAE) with flexible thin film resistive strain sensors embedded in polyimide substrate along with the relevant electronics. This paper explores the use of sensing sheets for damage detection using static and dynamic measurement. Laboratory testing on aluminum beam is used to demonstrate the performance of these sheets in idealized conditions. Sensing sheets employed on a pedestrian bridge are used to evaluate their performance in real life condition where the strains measurements are compared with the fiber-optic sensors already present on the bridge. Finally, sources of measurement errors and limitations are discussed.</p>

Low‐Cost and Large‐Area Strain Sensors Based on Plasmonic Fano Resonances

2016 ◽  
Vol 4 (5) ◽  
pp. 715-721 ◽  
Author(s):  
Fabian Lütolf ◽  
Daniele Casari ◽  
Benjamin Gallinet
Keyword(s):  
Low Cost ◽  
Strain Sensors ◽  
Fano Resonances ◽  
Large Area ◽  
Area Strain

scholarly journals Characterization of Integrated Optical Strain Sensors Based on Silicon Waveguides

2014 ◽  
Vol 20 (4) ◽  
pp. 101-110 ◽  
Author(s):  
Wouter J. Westerveld ◽  
Suzanne M. Leinders ◽  
Pim M. Muilwijk ◽  
Jose Pozo ◽  
Teun C. van den Dool ◽  
...  
Keyword(s):  
Strain Sensors ◽  
Silicon Waveguides ◽  
Integrated Optical ◽  
Optical Strain
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