Journal
SENSORS
Volume 19, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/s19081851
Keywords
wide-range FBG sensor; extra-large strain monitoring; strain transfer; linearity; stability
Funding
- National Key R&D Program of China [2017YFC1503103]
- National Natural Science Foundation of China [51578347, 51878420]
- Key Research and Development Program of Liaoning Province [2017231010]
- Shenyang Science and Technology Program [18-013-0-31]
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This research focuses on a desensitization method to develop a wide-range FBG sensor for extra-large strain monitoring, which is an essential requirement in large scale infrastructures or for some special occasions. Under appropriate hypotheses, the strain transfer distribution of wide-range FBG sensor based on the shear-lag theory is conducted to improve the accuracy of extra-large strain measurements. It is also discussed how the elastic modulus of adhesive layer affects the strain transfer rate. Two prototypes in different monitoring ranges are designed and fabricated by two layers of steel pipe encapsulation. The presented theoretical model is verified by experimental results. Moreover, it is demonstrated that experimentation in regards to the calibration of the wide-range FBG sensor, improved the amplification coefficient up to 2.08 times and 3.88 times, respectively. The static errors are both calculated and analyzed in this experiment. The wide-range FBG strain sensor shows favourable linearity and stability, which is an excellent property of sensors for extra-large strain monitoring.
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