Gu Bobo, Yin Ming-Jie, Zhang A Ping, Qian Jin-Wen, He Sailing
Center for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China.
Opt Express. 2009 Dec 7;17(25):22296-302. doi: 10.1364/OE.17.022296.
A new fiber-optic pH sensor based on a thin-core fiber modal interferometer with electrostatic self-assembled nanocoating is presented. After inserting a segment of thin-core fiber into a standard single-mode fiber, high-order cladding modes are excited and interfere with the core mode to form an in-fiber modal interferometer. The side surface of the sensor is then deposited with poly(allylamine hydrochloride) and poly(acrylic acid) nanocoating by electrostatic self-assembly technique. A fast and linear response is obtained in either acid or alkali solution (in the pH range 2.5 to 10) with resolution of 0.013 pH unit.
提出了一种基于带有静电自组装纳米涂层的薄芯光纤模态干涉仪的新型光纤pH传感器。将一段薄芯光纤插入标准单模光纤后，高阶包层模被激发并与芯模干涉，形成光纤内模态干涉仪。然后通过静电自组装技术在传感器侧面沉积聚（烯丙胺盐酸盐）和聚（丙烯酸）纳米涂层。在酸性或碱性溶液（pH范围为2.5至10）中可获得快速且线性的响应，分辨率为0.013pH单位。
