Micro-structured femtosecond laser assisted FBG hydrogen sensor | Zendy

Joseph Muna Karanja | Zendy; Yutang Dai | Zendy; Xian Zhou | Zendy; Bin Liu | Zendy; Minghong Yang | Zendy

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Micro-structured femtosecond laser assisted FBG hydrogen sensor

Author(s) -

Joseph Muna Karanja,

Yutang Dai,

Xian Zhou,

Bin Liu,

Minghong Yang

Publication year - 2015

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.031034

Subject(s) - materials science , femtosecond , hydrogen , optics , laser , hydrogen sensor , sensitivity (control systems) , fiber bragg grating , repeatability , fiber laser , optoelectronics , palladium , chemistry , wavelength , biochemistry , physics , organic chemistry , chromatography , electronic engineering , engineering , catalysis

We discuss hydrogen sensors based on fiber Bragg gratings (FBGs) micro-machined by femtosecond laser to form microgrooves and sputtered with Pd/Ag composite film. The atomic ratio of the two metals is controlled at Pd:Ag = 3:1. At room temperature, the hydrogen sensitivity of the sensor probe micro-machined by 75 mW laser power and sputtered with 520 nm of Pd/Ag film is 16.5 pm/%H. Comparably, the standard FBG hydrogen sensitivity becomes 2.5 pm/%H towards the same 4% hydrogen concentration. At an ambient temperature of 35°C, the processed sensor head has a dramatic rise in hydrogen sensitivity. Besides, the sensor shows good response and repeatability during hydrogen concentration test.

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