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Open AccessArticle

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

1
Key Laboratory of Pressure Systems and Safety (Ministry of Education), School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
2
Laboratory of Smart Materials and Structures, Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney 2006, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Sensors 2017, 17(3), 431; https://doi.org/10.3390/s17030431
Received: 30 November 2016 / Revised: 16 January 2017 / Accepted: 25 January 2017 / Published: 23 February 2017
(This article belongs to the Section Physical Sensors)
Local strain measurements are considered as an effective method for structural health monitoring of high-temperature components, which require accurate, reliable and durable sensors. To develop strain sensors that can be used in higher temperature environments, an improved metal-packaged strain sensor based on a regenerated fiber Bragg grating (RFBG) fabricated in hydrogen (H2)-loaded boron–germanium (B–Ge) co-doped photosensitive fiber is developed using the process of combining magnetron sputtering and electroplating, addressing the limitation of mechanical strength degradation of silica optical fibers after annealing at a high temperature for regeneration. The regeneration characteristics of the RFBGs and the strain characteristics of the sensor are evaluated. Numerical simulation of the sensor is conducted using a three-dimensional finite element model. Anomalous decay behavior of two regeneration regimes is observed for the FBGs written in H2-loaded B–Ge co-doped fiber. The strain sensor exhibits good linearity, stability and repeatability when exposed to constant high temperatures of up to 540 °C. A satisfactory agreement is obtained between the experimental and numerical results in strain sensitivity. The results demonstrate that the improved metal-packaged strain sensors based on RFBGs in H2-loaded B–Ge co-doped fiber provide great potential for high-temperature applications by addressing the issues of mechanical integrity and packaging. View Full-Text
Keywords: regenerated fiber Bragg grating (RFBG); metal-packaged; strain sensor; photosensitive fiber; high temperature; strength degradation; structural health monitoring regenerated fiber Bragg grating (RFBG); metal-packaged; strain sensor; photosensitive fiber; high temperature; strength degradation; structural health monitoring
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MDPI and ACS Style

Tu, Y.; Ye, L.; Zhou, S.-P.; Tu, S.-T. An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications. Sensors 2017, 17, 431. https://doi.org/10.3390/s17030431

AMA Style

Tu Y, Ye L, Zhou S-P, Tu S-T. An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications. Sensors. 2017; 17(3):431. https://doi.org/10.3390/s17030431

Chicago/Turabian Style

Tu, Yun; Ye, Lin; Zhou, Shao-Ping; Tu, Shan-Tung. 2017. "An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications" Sensors 17, no. 3: 431. https://doi.org/10.3390/s17030431

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