表述了从室温到1800℃测温范围的全程测温的蓝宝石单晶光纤温度传感器。该光纤传感器综合了光纤辐射测温技术和光纤荧光测温技术的特点,利用特殊生长的端部Cr3+离子掺杂的蓝宝石单晶光纤,使两者有机地结合,实现用单一光纤传感头达到大范围的温度测量。介绍了端部掺杂的蓝宝石单晶光纤的生长方法,分析了它的荧光温度特性、光纤传感头上荧光信号与热辐射信号的相互干扰以及光纤温度传感器的系统结构和工作原理,给出了实验结果

The sapphire fiber thermometer ranging from the room temperature to 1800℃ is described. It uses a specially grown sapphire fiber as the thermometer probe. The end part of the sapphire fiber is doped with Cr 3+ ion by means of the laser heat pedestal growth (LHPG) method and coated with some high radiant material to constitute a mini fiber cavity. Techniques of fluorescent lifetime detection and the radiance intensity detection were used. Growth of the end doped sapphire fiber is introduced. Analysis is made on the temperature dependence of fluorescence of the end doped sapphire fiber as well as the signal interference between the fluorescence and the thermal radiance. Experimental system of the thermometer and the preliminary experimental result are presented.