Optical fiber hydrogen sensor based on micro interferometer

In this paper, a femtosecond (fs) laser fabricated fiber in-line micro Michelson interferometer (MI) with palladium (Pd) film deposited on the fiber end face for hydrogen detection is proposed and demonstrated. Beam Propagation Method (BPM) is used to analyze the influence of refractive index (RI) of Pd film on reflection spectrum. As for the experimental results, the variation of optical power and shift of interference peak wavelength are -4.904 dBm and -4.2 nm respectively with the increase of hydrogen concentration from 0% to 16%. The developed system has high potential in hydrogen sensing with high sensitivity.

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