基于XPM的锁相光纤光栅传感器解调系统  

Demodulation system for phase-locked fiber grating sensors based on XPM

作　　者：张锦龙[1] 余重秀[1] 王葵如[1] 林妹妹[1] 赵德新[1] 

机构地区：[1]北京邮电大学电子工程学院

出　　处：《光电子．激光》2008年第6期743-745,757,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60677003);北京市教委共建资助项目(XK100130637)

摘　　要：将XPM技术首次应用于光纤光栅传感器解调系统。在采用干涉解调的基础上依据XPM原理,采用反馈控制的方式改变辅助光强度,应用锁相方法调制M-Z干涉仪信号光相位,使系统相位差始终锁定在灵敏度最高的位置。解决了干涉法解调精度非线性的问题;解决了只能在很小范围解调的问题;避免了背景光和解调电路暗电流对测量结果的影响和使用PZT调谐引入的迟滞效应和机械装置带来的误差。该系统温度测量精度可达0.1℃,不确定度为±0.3℃。The XPM technique is applied to the demodulation system for fiber grating sensor. According to XPM principle, the intensity of accessorial light can be altered by feedback control and the phase of the light signal from the M-Z interferometer can be modulated in a phase-locked way,thus the system phasic-difference can be locked at the point of the highest sensitivity. The method resolves the precision non-linearity of interferometric demodulation, the limit of very small range for demodulating,the non-linearity of the demodulating sensitivity,the affect of backlight and undercurrent pair in the demodulating circuit,the delay-effect by PZT tune and the error from the machine. The measurement precision of temperature can reach 0. 1 ℃ in this system,and the uncertainty is 0. 3 ℃.

关 键 词：光纤光栅 XPM M-Z干涉仪 解调 

分 类 号：TN253[电子电信—物理电子学] TP212.14[自动化与计算机技术—检测技术与自动化装置]