Self-correlation algorithm in optical frequency domain for cavity length interrogation of fiber-optic Fabry–Perot sensors
| Autor: | Honglai Yan, Xiyuan Wei, Amei Zhang, Lijuan Ma, Honglu Hou, Wei Wang, Liang He, Na Liao |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Optical fiber Resolution (electron density) Physics::Optics 02 engineering and technology Function (mathematics) 021001 nanoscience & nanotechnology Translation (geometry) 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Self correlation Optical frequencies law 0103 physical sciences Domain (ring theory) Electrical and Electronic Engineering 0210 nano-technology Algorithm Fabry–Pérot interferometer |
| Zdroj: | Optik. 225:165822 |
| ISSN: | 0030-4026 |
| DOI: | 10.1016/j.ijleo.2020.165822 |
| Popis: | A novel self-correlation algorithm is proposed to obtain accurately the cavity lengths of fiber-optic Fabry–Perot (FP) sensors from their white-light reflection spectrum. The reflection spectrum was first transformed into an optical frequency domain, which was then continuously translated with different frequency values and self-correlated with the untranslated values to obtain the self-correlation function of the translation frequency. The cavity length could be determined with high resolution by determining its period using the golden section method. The feasibility and performances of the proposed method were verified by both simulation and experiment. A high resolution of 14 nm could be obtained for a fiber-optic air-gap FP sensor with a cavity length of 200.888 μm. |
| Databáze: | OpenAIRE |
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