Abstract
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.
Highlights
Most structural disasters can be avoided if the structural behaviour had only been inspected, monitored, alerted, and analyzed continuously
Strain and deformation monitoring has played an important role in health monitoring of civil and industrial structures, especially for strain monitoring of special structures where it is supremely important that early warning signs are established
The static characteristic of the sensor refers to the relationship between the output and the input for the static input signal, including: linearity and repeatability, which are used for evaluating the accuracy of the wide-range Fiber Bragg grating (FBG) sensor monitoring
Summary
Most structural disasters can be avoided if the structural behaviour had only been inspected, monitored, alerted, and analyzed continuously. For the large crack monitoring application, Duan [8] presented the fabrication of an MEMS-based capacitive wide-scale strain sensor. Fiber Bragg grating (FBG) sensors have attracted wide attentions of the mechanical research community because of their many specific characteristics such as small mass, high sensitivity, and immunity to electromagnetic interference [11,12], which are suitable for displacement, acceleration, and pressure monitoring of large-scale structural components such as dams, bridges, and the aerospace and nuclear engineering fields. To obtain the measuring characteristics, calibration experiment on one prototype of the proposed FBG tilt sensor was carried out The sensitivities of these two-strain sensitivity FBGs were 140.85◦ /nm and 101.01◦ /nm over a wide range of 60◦.
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