减小噪声和量化误差影响的多阈值FBG波长解调方法  

A multi-threshold FBG wavelength demodulation method based on eliminating influence of noise and quantization error

作　　者：于国庆[1] 李永伟[2] 王震宇[2] 韩兴德[2] 

机构地区：[1]河北科技大学信息科学与工程学院,河北石家庄050018 [2]河北科技大学电气信息学院,河北石家庄050018

出　　处：《河北省科学院学报》2007年第4期17-21,共5页Journal of The Hebei Academy of Sciences

摘　　要：在FBG(Fiber Bragg Grating)传感阵列波长检测中,为提高检测精度和实时性,采用软件算法对FBG波长进行解调检测。利用FBG反射谱的对称性,针对量化误差对反射谱阈值采样点的影响,采用差值法进行直线拟合来逼近真值,减小了量化误差对FBG反射谱阈值点标定的影响,使采样精度提高了一个数量级;针对噪声对拟合直线的影响,采用逐差法减小噪声误差;在差值法和逐差法减小量化误差和噪声基础上,利用多阈值双边缘均值方法对FBG中心波长解调,提高了检测精度和速度。Using software method to detect FBG wavelength in the wavelength demodulation of FBG （ Fiber Bragg Grating） sensing matrix as to raise the detection accuracy and real-time, as symmetry of FBG reflection spectrum, the influence of quantization error to threshold sampling point is discussed using difference method to linear fitting technology to approximate the real-value, thus it decrease the influence of guantization error to the sampling of threshold point and raised a magnitude of the accuracy. As noise had the influence to fitted linear,a method of decreasing noise and smoothing curve is by successive minus method. Based on the difference method and successive minus method, muti-threshold double edge average method has been used to modulate center wavelength of FBG to raise the detection accuracy and real-time.

关 键 词：FBG波长解调 量化误差 差值法 逐差法 多阈值双边缘均值解调 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]