基于非均匀采样的光纤光栅解调系统  

FBG demodulation system with non-uniform sampling

作　　者：李锦明[1] 杜东海 赖正喜 张少华[1] 

机构地区：[1]中北大学电子测试国家重点实验室,仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《光电子．激光》2014年第12期2288-2293,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(91123036)资助项目

摘　　要：鉴于重叠多光纤Bragg光栅(FBG)传感器均匀采样时遇到的数据频谱混叠问题,提出利用扫描周期随机变化的正弦波实现传感FBG的非均匀采样方法,并在一种基于可调谐F-P滤波器的FBG解调系统中得到成功应用。实验结果显示,本文方法能够很好避免混叠现象,并且还能以低于Nyquist采样频率对信号进行采样分析。In order to solve the problem of signal distortion in the process of uniform sampling complied by the overlapping multiple fiber Bragg gratings （FBGs）,a new sampling method is proposed. The new way is nowuniform sampling which is implemented by the sine wave with random variation cycles. This way of sampling is successfully applied to the tunable Fabry-Perot （F-P） filter FBG demodulation system. The experimental results of the FBG demodulation system confirm that the phenomena of signal distortion are successfully solved by the nonniform sampling algorithm, the original signal can be sampled by the measured signal whose frequency is below the Nyquist sampling frequency, and the band- width of signal sample is also improved.

关 键 词：非均匀采样 重叠多光纤Bragg光栅(FBG) FBG解调 可调谐F-P滤波器 

分 类 号：TN253[电子电信—物理电子学] TP212.1[自动化与计算机技术—检测技术与自动化装置]