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Continuous-wave fiber cavity ring-down magnetic field sensing method based on frequency-shifted interferometry

田辉  周次明  范典  欧艺文  尹嘉笛  
【摘要】:We demonstrate a novel all-fiber cavity ring-down(CRD) magnetic field sensing method that uses frequency-shifted interferometry, and does not require any optical pulse and fast electronics compared with conventional CRD schemes. The sensing element in the ring-down cavity is a fiber taper surrounded by magnetic fluid, whose refractive index varies as an external magnetic field is applied. Magnetic field strength measurement is successfully achieved within a range from 8 to 850 Gs. A resolution of 0.00105 ± 0.00003 d B/Gs is obtained in the approximately linear segment from 423.2 to 766.6 Gs. The sensing method is potential for sensing other physical and chemical parameters.

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