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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。
Compared to ordinary electric sensors, optical fiber temperature sensor with high precision, wide sensing range, free from electromagnetic interference and so on. Rare earth doped optical fiber temperature sensors based on fluorescence intensity and fluorescence lifetime are easily disturbed by the external environment, and the measurement accuracy is uncertain. Using the ratio of the fluorescence intensities of the two levels of rare earth ions as a function of temperature changes, such interference can be eliminated (such as noise and fluctuations in the pump source) and the fluorescence intensity is insensitive to stress so that it It can be used as temperature compensation in many sensing systems where stress and temperature are cross-sensitive. The development status of fluorescence intensity ratio and temperature measurement of rare earth-doped fibers at home and abroad are summarized. The characteristics of fluorescence intensity ratio temperature measurement of erbium-doped, neodymium-doped and ytterbium-doped silica fibers are analyzed.