基于双LPFG及嵌入式技术的双边缘滤波解调系统  

Dual-edge Filter Demodulation System Based on Double LPFG and Embedded Technology

作　　者：李成贵[1,2] 张永胜[1] 魏鹏[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191 [2]北京航空航天大学北海学院,广西北海536000

出　　处：《仪表技术与传感器》2013年第6期102-104,107,共4页Instrument Technique and Sensor

摘　　要：设计并实现了一种基于双LPFG(长周期光纤光栅)及嵌入式技术的双边缘滤波光纤光栅传感解调系统。以双长周期光纤光栅作为线性滤波装置,利用反射FBG信号通过不同光谱特性的滤波器时输出不同光强的比值的对数算法对波长进行测算;系统采用C8051系列单片机作为处理核心,并逐一介绍了线性双边缘滤波原理、三MCU硬件设计架构、面向对象程序设计思想的软件设计架构和系统时序设计。试验表明系统能够实现稳定的FBG传感信号解调,解调系统所得线性拟合计算值与光谱仪所测波长值的均方差为10 pm,动态范围达4 nm,表明系统线性度好,精度较高,对于工程现场的波长校准与调试方面的应用具有很大意义。This paper designed and implemented the double edge of the filter fiber Bragg grating sensor demodulation system based on dual-LPFG,（long period fiber grating）and embedded technology.The system used widely used in C8051 series microcontroller as the processing core.And it described the linear dual-edge filter principle,the MCU hardware design architecture software design,architecture and system timing design,object-oriented programming ideas.The experiment results show the system can realize stable FBG sensor signal demodulation.The linear fit calculated values of the demodulation system and the wavelength values measured by the spectrometer are variance 10 pm,the dynamic range is 4 nm.It indicates the system possesses good linearity and high accuray,it＇s meaningful to engineering field applications.

关 键 词：FBG 长周期光纤光栅 线性双边缘滤波 嵌入式系统 面向对象 

分 类 号：TH741[机械工程—光学工程]