基于强度法和相移法的光纤氧传感测量系统

摘要

利用荧光猝灭原理检测氧浓度，构建了在线测量系统，可同时实现强度法测量和相移法测量。优选邻三（4，7－联苯－1，10－邻菲啰啉）二氯化钌为荧光指示剂，采用溶胶－凝胶法制备氧敏感膜，组装光纤氧传感探头。结果表明，氧浓度在0～100％范围内，荧光强度与氧浓度呈线性关系（ R2＞0.99）；系统参数对相移法测量的影响明显，通过参数调控可进行系统优化实现低氧浓度的高精度检测，理论检测下限约为3 ppm。%Oxygen content was simultaneously on-line measured by intensity and phase delay detection,based on fluorescence quenching.The oxygen-sensitive membrane was prepared by sol-gel,using tris(4,7 diphenyl-1,10 phenanthroline)ruthenium(II) dichloride as indicator.The results indicate that the intensity of fluorescence shows linear relationship( R2>0.99) with oxygen con-tent in region of 0~100 %.System parameters significantly affected phase delay detection.Via parameters regulation,precision de-tection of oxygen content could achieve.The theoretical lower limit was 3 ppm.