中文摘要：

为了提高正规包层-纤芯类倏逝波塑料光纤传感器的灵敏度,本文对传感器敏感区在真空和水浴中进行了老化处理。老化处理时,先将光纤部分区域的保护层去除;然后将这种裸光纤作为传感器的敏感区,对其进行真空和蒸馏水老化处理。对比研究了传感器敏感区经真空和蒸馏水老化不同时间后的光传输特性及灵敏度,分析了老化处理对传感器光传输特性与灵敏度的影响机理。研究表明：老化处理后,塑料光纤纤芯折射率及材料成分发生了变化,由此改变了光纤内部光传输模式及光纤表面有效倏逝场透射深度与传播长度,从而降低了传感器的光传输性能。传感器对葡萄糖溶液的灵敏度随着老化时间的延长先增大后减少,在真空中105℃老化处理20min后的灵敏度达到最高-0.004 2/g·（100mL）^-1,高于蒸馏水老化处理后的传感器灵敏度。研究结果对高灵敏度正规包层-纤芯类塑料光纤倏逝波传感器的研制提供了技术支撑。

英文摘要：

To improve the sensitivity of a plastic optical fiber（POF）evanescent wave sensor with the normal core-cladding structure,the sensitive region of the sensor was aged in vacuum and distilled water.In the ageing treatment,the partial coating of the POF was removed firstly,the uncoated region with the normal core-cladding structure was employed as the sensing region of the sensor,then the sensing region of the sensor was aged in vacuum and distilled water,respectively.The light transmission and sensitivity of the sensor after ageing different time in vacuum and distilled water were compared,and the effects of ageing treatment on the light transmission and sensitivity of thesensor were analyzed.The research indicates that after ageing treatment,the core refractive index of the POF and the material composition are changed,which allows the light transmission mode in the optic fiber,the penetration depth and transmission length of the effective evanescent wave at the surface of sensing region to be changed,so that the light transmission property is dropped.The experimental results also show that the sensitivity of the aged sensor in the glucose solutions firstly is increased,subsequently decreased with the increase of the ageing time,and the maximum sensitivity in the vacuum has reached-0.004 2/g·（100mL）-1 at temperature of 105 ℃ and ageing time for 20 min,higher than that of sensors with the ageing treatment in the distilled water.The research provides technological supports for developments of POF evanescent wave sensors with higher sensitivity and normal core-cladding structures.