从理论上和实验上研究了一种操作简单、响应速度快、价格低廉和高分辨率的基于阵列波导光栅(AWG)的准分布式光纤布拉格光栅(FBG)传感器。该传感系统采用了阵列波导光栅双通道强度解调技术对光纤光栅的布拉格波长和温度进行精确的解调。实验结果表明, 该系统对宽带宽光纤光栅的布拉格波长和温度解调均具有高线性度, 考虑系统稳定性及光纤布拉格光栅之间的串扰影响, 波长测量精度仍可达2 pm, 温度测量精度优于0.2 ℃。

A quasi-distributed fiber Bragg grating (FBG) sensor based on arrayed waveguide grating (AWG) is researched in theory and experiment. This sensor system has the advantages of easy operation, high response speed, low cost and high resolution. Its interrogating technique is based on the double-channel intensity–demodulating and the demultiplexing of an arrayed waveguide grating. The experimental result shows that the wavelength and temperature interrogation of the system have high linearity for the wide bandwidth of FBG, and the wavelength and temperature measurement accuracy reaches 2 pm and 0.2 ℃ under the effects of system stability and FBG crosstalk.