A Highly Sensitive Intensity-Modulated Optical Fiber Magnetic Field Sensor Based on the Magnetic Fluid and Multimode Interference
| Autor: | Xuekun Bai, Weilong Dong, Fufei Pang, Chuanlu Deng, Tingyun Wang, Liangjiang Wang, Zhang Xiaobei, Zhenyi Chen, Yi Huang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Optical fiber Article Subject Physics::Optics Polarization-maintaining optical fiber 02 engineering and technology 01 natural sciences Graded-index fiber law.invention 010309 optics Mode field diameter Optics law 0103 physical sciences lcsh:Technology (General) Dispersion-shifted fiber Electrical and Electronic Engineering Instrumentation Multi-mode optical fiber business.industry 021001 nanoscience & nanotechnology Control and Systems Engineering Fiber optic sensor lcsh:T1-995 0210 nano-technology business Intensity modulation |
| Zdroj: | Journal of Sensors, Vol 2017 (2017) |
| ISSN: | 1687-7268 |
| Popis: | Fiber-optic magnetic field sensing is an important method of magnetic field monitoring, which is essential for the safety of civil infrastructures, especially for power plant. We theoretically and experimentally demonstrated an optical fiber magnetic field sensor based on a single-mode-multimode-single-mode (SMS) structure immersed into the magnetic fluid (MF). The length of multimode section fiber is determined based on the self-image effect through the simulation. Due to variation characteristics of the refractive index and absorption coefficient of MF under different magnetic fields, an effective method to improve the sensitivity of SMS fiber structure is realized based on the intensity modulation method. This sensor shows a high sensitivity up to 0.097 dB/Oe and a high modulation depth up to 78% in a relatively linear range, for the no-core fiber (NCF) with the diameter of 125 μm and length of 59.8 mm as the multimode section. This optical fiber sensor possesses advantages of low cost, ease of fabrication, high sensitivity, simple structure, and compact size, with great potential applications in measuring the magnetic field. |
| Databáze: | OpenAIRE |
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