scholarly journals Opal-templated films for optical strain sensing

2020 ◽  
Vol 28 (11) ◽  
pp. 16280 ◽  
Author(s):  
Nonthanan Sitpathom ◽  
Tanyakorn Muangnapoh ◽  
Judith M. Dawes
Keyword(s):  
Strain Sensing ◽  
Optical Strain

scholarly journals The application of distributed optical strain sensing to measure the strain distribution of ground support members

FACETS ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 195-226 ◽  
Author(s):  
Bradley Forbes ◽  
Nicholas Vlachopoulos ◽  
Andrew J. Hyett
Keyword(s):  
Optical Fiber ◽  
Strain Distribution ◽  
Shear Loading ◽  
Strain Sensing ◽  
Micro Scale ◽  
Ground Support ◽  
Frequency Domain Reflectometry ◽  
Optical Strain ◽  
Mining Works ◽  
Cable Bolt

A distributed optical strain-sensing technique is presented as a solution for measuring the strain distribution along ground support members used in tunnelling and mining works. The technique employs a Rayleigh optical frequency domain reflectometry technology, which measures strain at a spatial resolution of 0.65 mm along the length of a standard optical fiber. A rationale for selecting this technology as a potential monitoring technique for ground support elements over alternative commercially available technologies is discussed. The development of a technique to couple optical fiber sensors with rock bolt, umbrella arch, and cable bolt support members is also demonstrated. A robust laboratory investigation of such optically instrumented support members demonstrated the capability of the technique to capture the expected in situ support behaviour in the form of coaxial, lateral, and shear loading arrangements as would be anticipated in the field. Moreover, the micro-scale data obtained by this optical sensing technique are shown to provide unprecedented insight into the local/micro-scale geomechanistic complexities associated with the bearing capacity of ground support members, especially when compared with data obtained by discrete strain-sensing technologies.

Using Ambient Vibrations to Detect Loosening of a Composite-to-Metal Bolted Joint in the Presence of Strong Temperature Fluctuations

2006 ◽  
Vol 129 (6) ◽  
pp. 710-717 ◽  
Author(s):  
J. M. Nichols ◽  
S. T. Trickey ◽  
M. Seaver ◽  
S. R. Motley ◽  
E. D. Eisner
Keyword(s):  
Alternative Hypothesis ◽  
Original Data ◽  
Surrogate Data ◽  
Data Sets ◽  
Strain Sensing ◽  
Data Set ◽  
Wave Forcing ◽  
Sensing System ◽  
Optical Strain ◽  
Nonlinear Feature

We present an approach for detecting damage-induced nonlinearities in structures. The method first involves the creation of surrogate data sets conforming to an appropriate null hypothesis (no damage). The second step is to then compare some nonlinear “feature” extracted from the original data to those extracted from the surrogates. Statistically significant differences suggest evidence in favor of the alternative hypothesis, damage. Using this approach we show how loose connections can be detected using ambient “wave” forcing, conforming to the Pierson-Moskowitz distribution, as the source of excitation. We also demonstrate the ability of this technique to operate without a recorded baseline data set and in the presence of widely varying temperatures. The structure in this case is a thick, composite beam bolted to a steel frame. Data are collected using an optical strain sensing system. For this experiment we are able to reliably detect the presence of a loosened bolt.

Dynamic Optical Strain Sensing

2020 ◽  
Author(s):  
Nonthanan Sitpathom ◽  
Tanyakorn Muangnapoh ◽  
Judith M Dawes
Keyword(s):  
Strain Sensing ◽  
Optical Strain

scholarly journals Highly flexible and stretchable optical strain sensing for human motion detection

Optica ◽  
2017 ◽  
Vol 4 (10) ◽  
pp. 1285 ◽  
Author(s):  
Jingjing Guo ◽  
Mengxuan Niu ◽  
Changxi Yang
Keyword(s):  
Motion Detection ◽  
Human Motion ◽  
Strain Sensing ◽  
Human Motion Detection ◽  
Optical Strain

Large scale synthesis of an amorphous polyester elastomer with tunable mechanoluminescence and preliminary application in optical strain sensing

2017 ◽  
Vol 5 (17) ◽  
pp. 4134-4138 ◽  
Author(s):  
Hongguo Shou ◽  
Kun Jia ◽  
Xin Zhou ◽  
Lingqiang Gao ◽  
Xiaohong He ◽  
...  
Keyword(s):  
Large Scale ◽  
Industrial Scale ◽  
Strain Sensing ◽  
Large Scale Synthesis ◽  
Optical Strain ◽  
First Time ◽  
Preliminary Application

The luminescent copolyester elastomer has been synthesized in industrial scale and used for optical strain sensing for the first time.

Dense Brushes of Tilted Metallic Nanorods Grown onto Stretchable Substrates for Optical Strain Sensing

2018 ◽  
Vol 1 (5) ◽  
pp. 2347-2355 ◽  
Author(s):  
Joseph Marae-Djouda ◽  
Arthur Gontier ◽  
Roberto Caputo ◽  
Gaëtan Lévêque ◽  
Bogdan Bercu ◽  
...  
Keyword(s):  
Strain Sensing ◽  
Optical Strain ◽  
Metallic Nanorods

scholarly journals Comprehensive Optical Strain Sensing Through the Use of Colloidal Quantum Dots

2020 ◽  
Vol 12 (39) ◽  
pp. 44156-44162 ◽  
Author(s):  
Michael D. Sherburne ◽  
Candice R. Roberts ◽  
John S. Brewer ◽  
Thomas E. Weber ◽  
Tod V. Laurvick ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Strain Sensing ◽  
Optical Strain
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