Bridge monitoring by Brillouin-based distributed strain measurements

2010 ◽  
Author(s):  
Aldo Minardo ◽  
Romeo Bernini ◽  
Lucio Amato ◽  
Luigi Zeni
Keyword(s):  
Bridge Monitoring ◽  
Strain Measurements ◽  
Distributed Strain

2504 Distributed Strain Measurements of Weld Joint by Optical Fiber Sensors

2007 ◽  
Vol 2007.6 (0) ◽  
pp. 209-210
Author(s):  
Kohei OHARA ◽  
Hideaki MURAYAMA ◽  
Kazuro KAGEYAMA ◽  
Isao OSAWA ◽  
Kiyoshi UZAWA ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Weld Joint ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Strain Measurements ◽  
Distributed Strain

scholarly journals Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

2010 ◽  
Vol 18 (25) ◽  
pp. 26484 ◽  
Author(s):  
Dragan Coric ◽  
Marco Lai ◽  
John Botsis ◽  
Aiping Luo ◽  
Hans G. Limberger
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Small Diameter ◽  
Bragg Gratings ◽  
Strain Measurements ◽  
Low Coherence ◽  
Distributed Strain

scholarly journals Comparison between Different Fiber Coatings and Adhesives on Steel Surfaces for Distributed Optical Strain Measurements based on Rayleigh Backscattering in Concrete Structures

2018 ◽  
Author(s):  
Martin Weisbrich ◽  
Klaus Holschemacher
Keyword(s):  
Optical Fiber ◽  
Steel Structures ◽  
Bending Test ◽  
Strain Measurements ◽  
Rayleigh Backscattering ◽  
Measurement Systems ◽  
Steel Surfaces ◽  
Optical Strain ◽  
Distributed Strain ◽  
Fiber Coatings

Optical fiber measurement systems have recently gained popularity following a multitude of intensive investigations. A new technique has been developed for these measurement systems that uses Rayleigh backscatter to determine the distributed strain measurement over the total length of a fiber. These measurement systems have great potential in civil engineering and structural health monitoring. This paper addresses some preliminary comparisons between three different fiber coatings and six different adhesives on steel structures. The results are based on a bending test with specimens made of precision flat steel; optical fiber strain measurements were compared with photogrammetric strain measurements. Analysis of the test data showed a strong correlation between the optical measurement system’s results and the theoretical results up to the yielding point of the steel. Furthermore, the results indicate that fibers with the Ormocer® and polyimide coatings have almost no loss in the strain measurements. The main results of this investigation are a guideline describing how to attach optical fibers to steel surfaces for distributed fiber optical strain measurements and recommendations for coatings to obtain realistic strain values. Additionally, the advantages of distributed strain measurements were revealed, which illustrates the potential of Rayleigh backscattering applications.

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