23 November 2009 A modified cross-correlation method for white-light optical fiber extrinsic Fabry-Perot interferometric hydrogen sensors
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Abstract
An extrinsic Fabry-Perot interferometric (EFPI) optical fiber hydrogen sensor based on palladium silver (Pd-Ag) film is designed for hydrogen leakage detection. A modified cross correlation signal processing method for an optical fiber EFPI hydrogen sensor is presented. As the applying of a special correlating factor which advises the effect on the fringe visibility of the gap length and wavelength, the cross correlation method has a high accuracy which is insensitive to light source power drift or changes in attenuation in the fiber, and the segment search method is employed to reduce computation and demodulating speed is fast. The Fabry-Perot gap length resolution of better than 0.2nm is achieved in a certain concentration of hydrogen.
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Zhen Yang, Zhen Yang, Min Zhang, Min Zhang, Yanbiao Liao, Yanbiao Liao, Shurong Lai, Shurong Lai, Qian Tian, Qian Tian, Qisheng Li, Qisheng Li, Yi Zhang, Yi Zhang, Zhi Zhuang, Zhi Zhuang, "A modified cross-correlation method for white-light optical fiber extrinsic Fabry-Perot interferometric hydrogen sensors", Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 75081O (23 November 2009); doi: 10.1117/12.839604; https://doi.org/10.1117/12.839604
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