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

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.

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

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 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

Chemically Engineered Carbon Nanotube-Polymer Composite Coatings for use as Remote Strain-Sensors

2004 ◽  
Vol 858 ◽  
Author(s):  
Jérôme Halary ◽  
John L. Stanford ◽  
Peter A. Lovell ◽  
Robert J. Young
Keyword(s):  
Carbon Nanotubes ◽  
Raman Band ◽  
Composite Coatings ◽  
Stress Transfer ◽  
Strain Sensors ◽  
Strain Sensitivity ◽  
Smart Coatings ◽  
Optical Strain ◽  
Polarized Raman ◽  
Polyurethane Matrix

ABSTRACTCarbon nanotubes nanocomposites with unique opto-mechanical properties have been developed as smart coatings. Remote polarized Raman spectroscopy has been used to monitor optical strain sensitivity of deformed coatings and determine local strains on the micron scale directly from stress/strain induced Raman band shifts.Chemically engineered carbon nanotubes and polymer matrices have been developed in order to overcome the limitations highlighted in previous reports. They have proved to be of significance importance in the optimization of the stress transfer between the nanotubes and the polyurethane matrix.

Carbon nanotubes as non-contact optical strain sensors in smart skins

2015 ◽  
Vol 50 (7) ◽  
pp. 505-512 ◽  
Author(s):  
Peng Sun ◽  
Sergei M Bachilo ◽  
R Bruce Weisman ◽  
Satish Nagarajaiah
Keyword(s):  
Carbon Nanotubes ◽  
Strain Sensors ◽  
Optical Strain
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