一种超弱光纤光栅的模块化解调系统  

A modular demodulation system of Ultra-weak fiber Bragg grating

作　　者：罗志会[1,2] 鲁博 向昊 杨震 徐冰 LUO Zhihui;LU Bo;XIANG Hao;YANG Zhen;XU Bing(Hubei Engineering Research Center of Weak Magnetic-field Detection,Chain Three Gorges University,Yichang 443002,China;College of Science,Chain Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学湖北省弱磁探测工程技术研究中心,宜昌443002 [2]三峡大学理学院,宜昌443002

出　　处：《黑龙江大学自然科学学报》2022年第6期741-749,共9页Journal of Natural Science of Heilongjiang University

基　　金：国家重点研发计划资助项目(2021YFC3001903)。

摘　　要：提出了一种超弱光纤光栅的模块化多通道解调系统,分析了该解调系统的工作原理,探讨了同波长光纤光栅的空间分辨率、反射率与光栅数量的关系。采用嵌入式电路对250 MSPS的高速A/D进行采集和缓存,配合C#上位机软件完成光栅阵列的定位、波长分析和处理,实现了4通道传感阵列的实时解调。该解调系统功耗低于13 W,体积230 mm×170 mm×40 mm,同波长光栅数量约5000个,多波长光栅数量达到13232个,空间分辨率2 m,单通道感测距离大于10 km,实现了超弱光纤光栅的大容量感测。A modularized Ultra-weak fiber Bragg grating(UW-FBG)demodulation system is proposed.The working principle of the system is analyzed,and the relationship among the spatial resolution,reflectivity and the number of gratings at the same wavelength is discussed.The embedded hardware circuit is used to collect and cache the high-speed A/D data of 250 MSPS,cooperate with the C#host computer software to complete the positioning,wavelength analysis and processing of the grating array,and realize the real-time demodulation of the 4-channels sensor array.The system is less than 13 W of the power consumption,the volume is 230 mm×170 mm×40 mm,the number of gratings with the same wavelength is about 5000,the number of multi-wavelength gratings is 13232,the spatial resolution is 2 m,and the single channel sensing distance is greater than 10 km.It truly has realized the large capacity sensing of UW-FBGs.

关 键 词：超弱光纤光栅 波长解调 传感器 现场可编程门阵列 模块化 

分 类 号：TP271[自动化与计算机技术—检测技术与自动化装置]