本征型光纤倏逝波化学传感器的研究

为了克服传统光纤化学传感器的不足，本文提出基于倏逝波原理的本征型光纤化学传感器。根据光线理论数值分析了传感器几何结构参数，溶液折射率与灵敏度的关系。通过化学腐蚀方法制备出不同参数结构的传感器，进行实验系统设计，并用不同浓度亚甲基蓝对这些传感器进行了实验研究。实验结果与数值计算结果一致，传感区纤芯越细，越长，其灵敏度越高。为了提高传感器灵敏度并保证纤芯不至于太细而折断，应少减小传感器直径，有效增加其长度。

Intrinsic optic fiber evanescent wave chemical sensor

In order to overcome some deficiencies of the traditional optic fiber chemical sensor, the intrinsic optic fiber chemical sensor based on evanescent wave theory is proposed. The relationship between sensitivity and geometrical structure parameters, the refractive index of solution were calculated and analyzed based ray theory. The sensor of different structure parameters was fabricated with chemical corrosion method, the experimental system was designed and the experimental study was carried out for these sensors using the methylene blue solution. The experimental results is concordant with numerical results, and the thinner, the longer the sensing area is, the higher the sensitivity is. The bear core is so thin that the fiber is break off easily. For improve the sensitivity, decrease the diameter of sensor less and increase the length of sensor is a effective method.