基于稀土掺杂光纤荧光强度比的温度传感

相比于普通电传感器，光纤温度传感器具有精度高、传感范围宽、不受电磁干扰等优点。基于荧光强度、荧光寿命的稀土掺杂光纤温度传感器容易受到外部环境的干扰，测量精度存在不确定性。利用稀土离子两个能级的荧光强度的比值随温度变化的特性进行测温，可消除这种干扰（如泵浦源的噪声和波动），而且荧光强度比对应力的不敏感性，使得它可以在很多应力与温度交叉敏感的传感系统中作为温度补偿。总结了国内外相关稀土掺杂光纤的荧光强度比测温的发展状况，分析了掺铒、掺钕、掺镱等石英光纤的荧光强度比温度测量的特点。

Temperature Sensing Based on Fluorescence Intensity Ratio of Rare Earth-Doped Fiber

Compared with common electric sensors, optical fiber temperature sensor features high precision, wide sensing range, being immune to EMI, etc.. The rare earth-doped optical fiber temperature sensor based on fluorescence intensity and fluorescence lifetime is subject to the influence from external environment, leading to the uncertainty of the measuring precision. Utilizing the ratio of fluorescence intensity （FIR） from two energy levels of rare earth ions to measure temperature can eliminate such kind of interference （e. g. the noise and fluctuations in the pump source）, furthermore the insensibility of FIR to strain makes it being able to be used as temperature compensation in many sensing systems that are simultaneous strain and temperature sensitive. The development status of temperature detection based on the FIR of rare earth-doped optical fiber both at home and abroad is summarized, and the performance of the temperature measurement based on the FIR of erbium, neodymium, and ytterbium doped silica fibers are analyzed.