In-Plane Strain Measurement in Composite Structures with Fiber Bragg Grating Written in Side-Hole Elliptical Core Optical Fiber
| Autor: | Karol Wachtarczyk, Paweł Gąsior, Jerzy Kaleta, Alicja Anuszkiewicz, Marcel Bender, Ralf Schledjewski, Paweł Mergo, Tomasz Osuch |
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| Rok vydání: | 2021 |
| Předmět: |
Technology
Microscopy QC120-168.85 high birefringent fibers fiber optic sensor fiber Bragg grating side-hole optical fiber carbon fiber reinforced polymer multi-axial strain sensing QH201-278.5 Physics::Optics Engineering (General). Civil engineering (General) Article TK1-9971 Descriptive and experimental mechanics General Materials Science Electrical engineering. Electronics. Nuclear engineering TA1-2040 |
| Zdroj: | Materials; Volume 15; Issue 1; Pages: 77 Materials Materials, Vol 15, Iss 77, p 77 (2022) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma15010077 |
| Popis: | In this paper, the application of a fiber Bragg grating written in a highly birefringent side-hole elliptical core optical fiber for two-axial strain measurement is presented. Hybrid optical fiber structures achieved by combining large side-holes and elliptical core result in a very high birefringence of 1 × 10−3 and thus high initial Bragg peak spectral separation of 1.16 nm, as well as a very high transverse force sensitivity, of up to 650 pm/(N/mm) or even −1150 pm/(N/mm), depending on the fiber orientation with respect to the applied force. Due to the ~22 %m/m GeO2 concentration in the core the fiber being highly photosensitive, which significantly simplifies FBG fabrication by UV illumination without the need for prior hydrogen loading, which worsens thermal stability. Finally, the developed FBGs written in the highly birefringent side-hole elliptical core optical fiber were embedded in the square composite plates and applied for strain measurements. Tests of two-directional four-point bending have shown usability of such FBG for two-axial in-plane strain measurement with a single FBG in iso-thermal conditions. |
| Databáze: | OpenAIRE |
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