为了克服传统光纤化学传感器的不足,提出了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溶液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。

In order to overcome some deficiencies of the traditional optic fiber chemical sensor, the intrinsic optic fiber chemical sensor based on evanescent wave theory was proposed. The relationship between sensitivity and geometrical structure parameters, the refractive index of solution were calculated and analyzed based on ray theory. The sensors of different structure parameters were fabricated with chemical corrosion method, the experimental system was designed and the test was carried out for these sensors using the methylene blue solution. The experimental results are concordant with numerical results, and the thinner, longer the sensing area is, the higher the sensitivity is.