Abstract
The combination of fiber optics with nano-structure technologies and sensitive thin films offers great potential for the realization of novel sensor concepts. Miniatured optical fiber sensors with thin films as sensitive elements could open new fields for optical fiber sensor applications. Thin films work as sensitive elements and transducer to get response and feedback from environments, in which optical fibers are employed to work as signal carrier. This article presents some research work conducted at the National Engineering Laboratory for Optical Fiber Sensing Technologies in recent years. Concrete examples are: Pd/WO3 co-sputtered coating as sensing material for optical hydrogen sensors shows robust mechanical stability and meanwhile good sensing performance; TbDyFe magnetostrictive coating directly deposited on fiber Bragg grating (FBG) demonstrates its possibility of miniature optical magnetic field/current sensors, and 40-pm shift of the FBG wavelength happens at a magnetic field order of 50 mT.
Highlights
Optical fiber hydrogen sensor has been a research issue due to its excellent characteristics such as nature safety, small volume, and anti-electromagnetic interference
Thin films work as sensitive elements and transducer to get response and feedback from environments, and optical fiber here is employed to work as signal carrier
This paper presents some research work conducted at the National Engineering Laboratory for Optical Fiber Sensors in recent years
Summary
Optical fiber hydrogen sensor has been a research issue due to its excellent characteristics such as nature safety, small volume, and anti-electromagnetic interference. It can be seen that all FBGs coated with the hydrogen sensitive film shift to longer wavelength with an increase of the hydrogen’s concentration. Common FBG, SP-FBG-2, SP-FBG-3 and SP-FBG-4 coated with 110-nm WO3-Pd composite film saturate at 8% hydrogen, and corresponding wavelength shifts are 16 pm, 40 pm, 45 pm and 55 pm, respectively. For 40-nm WO3-Pd composite film, SP-FBG’s wavelength shift is three times as that of the common FBG exposed to the same concentration hydrogen. When the hydrogen concentration is 1%, there is almost no wavelength shift for standard FBG coated with 50-nm Pd/Ag composite film. SP-FGB-1 coated with 50-nm Pd/Ag composite film FBG coated with 110-nm Pd/Ag composite film
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