阐述了一种基于长周期光纤光栅和ZigBee 组网技术的无线溶液折射率传感网络。整个系统包括了传感节点、路由节点、协调器和中心计算机几个部分。传感节点部分，设计了一种基于强度调制型的低成本的长周期光纤光栅溶液折射率传感器，其中包括了长周期光纤光栅和一种特殊结构的封装。同时，设计了传感器的驱动板，包括激光二极管及其驱动电路、光电探测电路。利用损耗峰两侧近似线性的特性，通过测量单侧损耗峰半峰处固定波长光功率的变化实现了折射率传感。系统搭建了基于ZigBee 的自组网系统，并且实现了实时的多点的溶液折射率监测。测量了折射率为1.3347~1.3418 的氯化钠溶液，分辨率为0.0001，最大误差为0.0004，平均误差为0.00015。所述系统提供了一种将光纤传感器应用于无线传感网络的方案，其优势在于可以大面积铺设大量低成本传感器并组网，方便地增减传感节点，实现了大范围、多点、高分辨率的环境监测。

A novel liquid refractive index (RI) wireless sensor network based on long period fiber gratings (LPFGs) and ZigBee is presented. The system includes sensor node, router node, coordinator and computer. In the sensor node, a kind of low-cost LPFG sensor based on the light intensity modulation is designed to measure liquid RI, which is made up with LPFGs and a special fabrication. At the same time, driver board of sensor is designed, which is made up with laser diode and photonic diode. Because of the nearly linear sides of loss peaks, the light power at one side of half of loss peak at fixed wavelength is measured to monitoring RI. A system is established by Zigbee, and realizes real- time, multi- point RI monitoring. NaCl solution, which has the RI range from 1.3347 to 1.3418, is measured. The resolution of RI is 0.0001, the maximum error of the sensor is 0.0004, and the average error is 0.00015. The system provides a new solution for applying optical fiber sensors to wireless network. It is convenient to set low- cost sensor network in large area and remove or add sensor nodes, and it has realized large-scale, multi-point, and high resolution environmental monitoring.