Bragg Gratings in Two-Core Rectangular Fiber for Discrimination of Curvature, Strain, and Temperature Measurements
| Autor: | Lin Htein, Chern Yang Leong, Hwa Yaw Tam, Dinusha Serandi Gunawardena |
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| Rok vydání: | 2021 |
| Předmět: |
Optical fiber
Materials science business.industry 020208 electrical & electronic engineering 02 engineering and technology Coupling (probability) Cladding (fiber optics) Curvature law.invention Core (optical fiber) Orientation (vector space) Optics Fiber Bragg grating law 0202 electrical engineering electronic engineering information engineering Fiber Electrical and Electronic Engineering business Instrumentation |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 70:1-7 |
| ISSN: | 1557-9662 0018-9456 |
| DOI: | 10.1109/tim.2020.3035528 |
| Popis: | We report, for the first time, the development of a rectangular fiber with two cores consisting of different refractive indices for the discrimination of temperature effects during strain or curvature measurements using fiber Bragg gratings written in a single segment of fiber. Two cores with a diameter of $8~\mu \text{m}$ and a rectangular cladding with dimensions of $120\,\,\mu \text{m} \times 255\,\,\mu \text{m}$ permit convenient splicing to conventional single-mode fiber and support easy identification of the orientation of the fiber. When placed in the desired orientation, each core of the two-core rectangular fiber experiences a different spectral shift in the presence of applied strain or curvature. The sensitivities of the two cores are 0.87 and 1.08 pm/ $\mu \varepsilon $ for strain, 126 and −128 pm/m−1 for curvature, and 10.05 and 10.40 pm/°C for temperature, respectively. In addition, the flat cladding structure of the fiber provides a large physical contact area between the sensing fiber and the substrate than a circular fiber and allows better strain coupling between the object and the fiber. |
| Databáze: | OpenAIRE |
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