期刊
OPTICS EXPRESS
卷 23, 期 24, 页码 31034-31042出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.031034
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资金
- National Science Foundation of China, (NSFC) [61475121, 61377092]
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 degrees C, the processed sensor head has a dramatic rise in hydrogen sensitivity. Besides, the sensor shows good response and repeatability during hydrogen concentration test. (c) 2015 Optical Society of America
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