Distributed dynamic strain sensing in coherent Φ-OTDR with pulse conversion algorithm

2021 ◽  
Author(s):  
Heng Qian ◽  
Bin Luo ◽  
Haijun He ◽  
Xihua Zou ◽  
Wei Pan ◽  
...  
Keyword(s):  
Dynamic Strain ◽  
Strain Sensing ◽  
Conversion Algorithm

scholarly journals Distributed and dynamic strain sensing with high spatial resolution and large measurable strain range

2020 ◽  
Vol 45 (18) ◽  
pp. 5020
Author(s):  
Li Zhang ◽  
Zhisheng Yang ◽  
Nachum Gorbatov ◽  
Roy Davidi ◽  
Malak Galal ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Strain Range ◽  
Dynamic Strain ◽  
Strain Sensing

scholarly journals An Experimental Study on Static and Dynamic Strain Sensitivity of Smart Concrete Sensors Doped with Carbon Nanotubes for SHM of Large Structures

2018 ◽  
Author(s):  
Andrea Meoni ◽  
Antonella D'Alessandro ◽  
Austin Downey ◽  
Enrique García-Macías ◽  
Marco Rallini ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Reinforced Concrete ◽  
Experimental Testing ◽  
Dynamic Strain ◽  
Cement Matrix ◽  
Strain Sensitivity ◽  
Strain Sensing ◽  
Multi Walled Carbon Nanotubes ◽  
Material Fabrication ◽  
Smart Concrete

The availability of new self-sensing cement-based strain sensors allows the development of dense sensor networks for Structural Health Monitoring (SHM) of reinforced concrete structures. These sensors are fabricated by doping cement-matrix materials with conductive fillers, such as Multi Walled Carbon Nanotubes (MWCNTs), and can be embedded into structural elements made of reinforced concrete prior to casting. The strain sensing principle is based on the multifunctional composites outputting a measurable change in their electrical properties when subjected to a deformation. Previous work by the authors was devoted to material fabrication, modeling and applications in SHM. In this paper, we investigate the behavior of several sensors fabricated with and without aggregates and with different MWCNTs content. The strain sensitivity of the sensors, in terms of fractional change in electrical resistivity for unit strain, as well as their linearity are investigated through experimental testing under both static and dynamically varying compressive loadings. Moreover, the responses of the sensors when subjected to destructive compressive tests are evaluated. Overall, the presented results contribute to improving the scientific knowledge on the behavior of smart concrete sensors and to furthering their understanding for SHM applications.

Sagnac fiber interferometer with the population grating for fiber Bragg grating dynamic strain sensing

2021 ◽  
Vol 17 (12) ◽  
pp. 723-728
Author(s):  
Wei Wang ◽  
Chuanyi Tao ◽  
Hao Wang ◽  
Xuhai Jiang ◽  
Rong Chen ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Dynamic Strain ◽  
Bragg Grating ◽  
Strain Sensing

A comparison of optical and electrical dynamic strain sensing systems

2008 ◽  
Author(s):  
David S. George ◽  
Stephen Hill ◽  
Bob Howden ◽  
Graham W. Smith
Keyword(s):  
Dynamic Strain ◽  
Strain Sensing ◽  
Sensing Systems

100km dynamic strain sensing via CP-ΦOTDR

2018 ◽  
Author(s):  
Ji Xiong ◽  
Zinan Wang ◽  
Yue Wu ◽  
Yongxiang Chen ◽  
Yunjiang Rao
Keyword(s):  
Dynamic Strain ◽  
Strain Sensing
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