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 C1RD 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 dB/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.
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 C1RD 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 dB/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.
基金
supported by the Project of National Science Foundation of China(Nos.61077061 and 61377091)
the Fundamental Research Funds for the Central Universities(Nos.WUT 2013-II-023 and WUT 2014-zy-115)
