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9 September 2002 Sensitive current sensing base on all-fiber Mach-Zehnder interferometer
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A direct current sensor based on all-fiber Mach-Zehnder interferometer is demonstrated in this paper. The phases of interferometric lights in the interferometer is modulated by heat effect when current flowing through a thin metal tube. The charactersistics of current sensing are studied experimentally. Adopting the wavelength scale method, in the case of elimination of environmental perturbation, the wavelength changing range is 32nm when the current changes from 0 to 1.8A. The shifting wavelength is linear to the power and the linear fitting is 0.9987. The tuning efficiency is approximately 19.47nm/W.
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Zhengrong Tong, Yonglin Huang, Shiquan Yang, Dejun Feng, Guiyun Kai, Qida Zhao, and Xiaoyi Dong "Sensitive current sensing base on all-fiber Mach-Zehnder interferometer", Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002);

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