光纤菲佐传感器频分复用网络解调方法研究  

Demodulation Algorithm for Frequency-Division-Multiplexed Fiber-Optic Fizeau Strain Sensor Networks

作　　者：饶云江[1] 王希晶[1] 朱涛[1] 周昌学[1] 

机构地区：[1]重庆大学光电工程学院

出　　处：《光学学报》2006年第7期997-1000,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60477030);重庆市自然科学重点基金(8415)资助课题

摘　　要：为了减小光纤菲佐传感器间的串扰,提高传感器网络的复用能力,提出了基于Pisarenko正弦波恢复法的光纤菲佐应变传感器频分复用网络光谱解调方案。在多光束干涉原理的基础上,建立了基于Pisarenko正弦波恢复方法的传感器频分复用解调模型,并对2个光纤菲佐传感器的串扰进行了实验研究。快速傅里叶变换能够达到应变精度好于±10με的传感器间最小腔长差约为500μm,而该方法可以把最小腔长差缩短至100μm左右。这意味着系统的复用能力提高了大约5倍。因此,该方法是一种串扰小、复用能力强的解调方法,在大容量准分布式传感网络中具有极大的潜在应用价值。A spectral demodulation algorithm based on Pisarenko sine wave recovery method for frequency-divisionmultiplexed （FDM） fiber-optic Fizeau strain sensor networks is proposed, which is used to effectively reduce the cross talk between two adjacent sensors, and thus enhance the network multiplexing capability. Based on principle of multi-beam interferomety, demodulation model for such networks is built up and experiments are carried out to study the cross talk of two fiber-optic Fizeau sensors. The experimental results show that a strain accuracy better than ±10με has been achieved even when the cavity length difference is 100μm approximately, while it is about 500μm for fast Fourier transform. It demonstrates that the multiplexing capability of the FDM fiber-optic Fizeau sensor networks can be improved by 5 times. Hence, with a low cross talk and strong multiplexing capality, the method can be widely used in quasi-distributed high multiplexing capability optical sensing systems.

关 键 词：导波与光纤光学 光纤菲佐应变传感器网络 Pisarenko正弦波解调 串扰 复用能力 频分复用 

分 类 号：TN253[电子电信—物理电子学]