Long period fiber gratings are emerging as a potential candidate in the list of surrounding refractive index optical fiber sensors. Their sensitivity can be enhanced greatly if the grating period, fiber dimensions and...Long period fiber gratings are emerging as a potential candidate in the list of surrounding refractive index optical fiber sensors. Their sensitivity can be enhanced greatly if the grating period, fiber dimensions and surrounding refractive index are optimized in a way to operate at a point called turn around point on phase matching curves of these gratings. Turn around point LPFGs are well known for their ultrahigh sensitivity to external parameters. Potential of operating LPFG at or near turn around point has been investigated by many researchers in various applications including physical parameter sensing, adulteration detection, radiation dose, etc. Since TAP LPFGs are in investigation phase therefore a lot of rigorous & efficient work in finding techniques for optimizing their potential as sensor in chemical, biochemical, structural health monitoring is still to be carried out. A brief review of work carried out in this domain till now is presented here and key findings from literature review are highlighted.展开更多
研究了氧化石墨烯(Graphene Oxide,GO)修饰的色散拐点长周期光纤光栅(Dispersion-Turning-Point Long Period Fiber Grating,DTP-LPFG)传感器,分析了其光谱特性及对外部折射率的灵敏度特性。利用准连续KrF激光器在载氢单模石英光纤上制...研究了氧化石墨烯(Graphene Oxide,GO)修饰的色散拐点长周期光纤光栅(Dispersion-Turning-Point Long Period Fiber Grating,DTP-LPFG)传感器,分析了其光谱特性及对外部折射率的灵敏度特性。利用准连续KrF激光器在载氢单模石英光纤上制作周期约为136μm的DTP-LPFG,采用氢键结合的方式将GO涂覆于光栅表面,构成基于GO修饰的DTPLPFG传感器。实验结果表明:随着GO在DTP-LPFG表面的沉积,其双谐振峰的左峰发生蓝移,右峰发生红移,双峰间距增大;在1.33~1.38折射率范围内,该传感器在涂覆GO后,谐振双峰间距变化量的折射率灵敏度约为831.89nm/RIU,较未修饰GO的DTP-LPFG提高了1.05倍。展开更多
文摘Long period fiber gratings are emerging as a potential candidate in the list of surrounding refractive index optical fiber sensors. Their sensitivity can be enhanced greatly if the grating period, fiber dimensions and surrounding refractive index are optimized in a way to operate at a point called turn around point on phase matching curves of these gratings. Turn around point LPFGs are well known for their ultrahigh sensitivity to external parameters. Potential of operating LPFG at or near turn around point has been investigated by many researchers in various applications including physical parameter sensing, adulteration detection, radiation dose, etc. Since TAP LPFGs are in investigation phase therefore a lot of rigorous & efficient work in finding techniques for optimizing their potential as sensor in chemical, biochemical, structural health monitoring is still to be carried out. A brief review of work carried out in this domain till now is presented here and key findings from literature review are highlighted.
文摘研究了氧化石墨烯(Graphene Oxide,GO)修饰的色散拐点长周期光纤光栅(Dispersion-Turning-Point Long Period Fiber Grating,DTP-LPFG)传感器,分析了其光谱特性及对外部折射率的灵敏度特性。利用准连续KrF激光器在载氢单模石英光纤上制作周期约为136μm的DTP-LPFG,采用氢键结合的方式将GO涂覆于光栅表面,构成基于GO修饰的DTPLPFG传感器。实验结果表明:随着GO在DTP-LPFG表面的沉积,其双谐振峰的左峰发生蓝移,右峰发生红移,双峰间距增大;在1.33~1.38折射率范围内,该传感器在涂覆GO后,谐振双峰间距变化量的折射率灵敏度约为831.89nm/RIU,较未修饰GO的DTP-LPFG提高了1.05倍。
