Chinese Optics Letters, Volume. 12, Issue 12, 120604(2014)
Continuous-wave fiber cavity ring-down magnetic field sensing method based on frequency-shifted interferometry
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 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.
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Hui Tian, Ciming Zhou, Dian Fan, Yiwen Ou, Dijia Yin. Continuous-wave fiber cavity ring-down magnetic field sensing method based on frequency-shifted interferometry[J]. Chinese Optics Letters, 2014, 12(12): 120604
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Received: Jul. 4, 2014
Accepted: Oct. 11, 2014
Published Online: Dec. 1, 2014
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