Distributed strain sensing for structural monitoring applications

2000 ◽  
Vol 27 (5) ◽  
pp. 873-879 ◽  
Author(s):  
Michael DeMerchant ◽  
Anthony Brown ◽  
Jeff Smith ◽  
Xiaoyi Bao ◽  
Theodore Bremner
Keyword(s):  
Strain Measurement ◽  
Measurement Accuracy ◽  
Brillouin Scattering ◽  
Strain Sensor ◽  
Structural Monitoring ◽  
Strain Sensing ◽  
Fibre Optics ◽  
Laboratory Test Results ◽  
The University ◽  
Distributed Strain

Strain sensors are a valuable tool for assessing the health of structures. The University of New Brunswick, in conjunction with ISIS Canada, is developing a distributed fibre optic strain sensor based on Brillouin scattering. This sensor can provide a virtually unlimited number of measurement points using a single optical fibre. A description of the operating principles of the system is given, along with a summary of laboratory test results. Strain measurement accuracy as high as approximately ±11 µε has been demonstrated at 1 m spatial resolution. Spatial resolutions as short as 100 mm can be used, although with decreased strain measurement accuracy. Future development of the technology will include an enhancement allowing both strain and temperature to be measured simultaneously.Key words: strain sensor, fibre optics, distributed sensing, structural monitoring, Brillouin scattering.

scholarly journals Comparative Assessment of Distributed Strain Measurement Technologies

2021 ◽  
Keyword(s):  
Electromagnetic Interference ◽  
Strain Measurement ◽  
Single Point ◽  
Image Correlation ◽  
Strain Sensing ◽  
Element Analysis ◽  
Industry Standard ◽  
Sensing Technology ◽  
Technology Group ◽  
Distributed Strain

Abstract. Fibre optic (FO) distributed strain sensing technology has introduced a significant new capability for structural health monitoring (SHM). FO sensing (FOS) offers a simpler installation process with improved resistance to corrosion and electromagnetic interference compared to traditional electrical resistance foil strain gauges (FSGs) which unlike FOS is limited to single point measurements. Previous FO distributed strain measurement studies at the Defence Science and Technology Group showed good correlation between strain measurements derived from a proprietary continuous fibre grating system and FSGs. This paper compares a commercially available, non-proprietary FO sensing system and digital image correlation (DIC) against industry standard FSGs and finite element analysis (FEA) predictions.

scholarly journals Optical characterization of strain sensing cables for Brillouin optical time domain analysis

2021 ◽  
Vol 255 ◽  
pp. 12011
Author(s):  
Filippo Bastianini ◽  
Francesco Falcetelli ◽  
Paweł Bocheński ◽  
Leonardo Rossi ◽  
Raffaella Di Sante ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Measurement Accuracy ◽  
Time Domain Analysis ◽  
Optical Characterization ◽  
Strain Sensing ◽  
Strain Transfer ◽  
Optical Time ◽  
Improved Design ◽  
Improved Strain

Two innovative optical fibre cable layouts designed to improve BOTDA strain measurement accuracy through improved strain transfer efficiency are presented, discussed and tested through experiments, analytical and numerical modelling. The second improved design presents good features to minimize the mismatch between measured and actual strain.

Sign in / Sign up

Export Citation Format

Share Document