Abstract
In terms of hydrogen sensing and detection, optical fiber hydrogen sensors have been a research issue due to their intrinsic safety and good anti-electromagnetic interference. Among these sensors, hydrogen sensors consisting of fiber grating coated with sensitive materials have attracted intensive research interests due to their good reliability and distributed measurements. This review paper mainly focuses on optical fiber hydrogen sensors associated with fiber gratings and various materials. Their configurations and sensing performances proposed by different groups worldwide are reviewed, compared and discussed in this paper. Meanwhile, the challenges for fiber grating hydrogen sensors are also addressed.
Highlights
With aggravated air pollution and increasing fossil fuel consumption, exploiting clean and renewable energy is urgent for humankind
With the irradiation of ultraviolet light, the water photolysis effect of Pt-loaded WO3 coating can be introduced into the hydrogen sensing process
This paper proposes a novel method to enhance the stability of hydrogen sensor based on Pt-loaded WO3 coating
Summary
With aggravated air pollution and increasing fossil fuel consumption, exploiting clean and renewable energy is urgent for humankind. Optical fiber hydrogen sensors can be intrinsically safe as they employ optical signals as a sensing medium, and as such they have attracted much research interest. Several review articles [36,37,38,39] related to optical hydrogen sensors have been published These papers have summarized optical fiber hydrogen sensors from different perspectives. A review paper about optical fiber grating hydrogen sensors is presented from a distinct perspective. According to classification of hydrogen-sensitive materials, two types of fiber grating hydrogen sensors have been. Type is based on Pt-loaded WO3 coatings [40,41,42,43,44] or other oxide materials [45] undergoing an undergoing an exothermic or gasochromic reaction [46,47] in a hydrogen atmosphere. Performances of these sensors are presented in the following paragraphs
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