基于锁模激光器的FBG电流传感器高速解调系统  

High Speed Demodulation System for FBG Current Sensor Based on Mode-Locked Laser

作　　者：王华 何群 谭如超 武冬 方一诺 马跃辉 严开全 牟成博 WANG Hua;HE Qun;TAN Ruchao;WU Dong;FANG Yinuo;MA Yuehui;YAN Kaiquan;MOU Chengbo(Information and Communication Branch of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,Jiangxi,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China)

机构地区：[1]国网江西省电力有限公司信息通信分公司,江西南昌330096 [2]上海大学特种光纤与光接入网重点实验室,上海200444

出　　处：《应用科学学报》2024年第6期903-911,共9页Journal of Applied Sciences

基　　金：国网江西省电力有限公司科技项目(No.521835200038)资助。

摘　　要：智能电网可靠、安全、经济、高效的发展目标,对电流参数的检测速率提出了更高的需求。本文开展了锁模激光器对基于磁致伸缩效应的光纤布拉格光栅(fiber Bragg grating, FBG)电流传感器复用实现高速解调的实验研究,首次将时间拉伸-色散傅里叶变换(time-stretch dispersive Fourier transformation, TS-DFT)技术与光纤电流传感技术进行了结合。固定于磁致伸缩材料表面的FBG能够感知通电螺线管产生的磁场所引发的材料应变。TS-DFT技术可将应力引起的FBG波长偏移映射为时域上反射脉冲的时延偏移实现高速解调。在0~4.5 A电流范围内对2个传感FBG的波长复用进行监测,系统的解调速率高达69.6 MHz,该技术在电流或磁场传感领域有广阔的应用前景。The development goals of reliable,safe,economical,and efficient smart grid place higher demands on the detection rate of current parameters.This paper presents an experimental investigation of high-speed demodulation of fiber Bragg grating(FBG)current sensor,based on magnetostrictive effect and mode-locked laser multiplexing.For the first time,time-stretch dispersive Fourier transformation(TS-DFT)is combined with fiber current sensing techniques.FBG,fixed on the magnetostrictive material,detects the material strain caused by the magnetic field generated by the energized solenoid,enabling current sensing. TS-DFT maps the wavelength shift of FBG caused by stress to the time-domaindelay shift in the reflected pulse, facilitating high-speed demodulation. The wavelengthmultiplexing of the two sensing FBGs is monitored in the current range of 0 to 4.5 A,achieving a demodulation rate of up to 69.6 MHz. This method has broad applicationprospects in the field of current or magnetic field sensing.

关 键 词：锁模激光器 时间拉伸-色散傅里叶变换 磁致伸缩效应 光纤布拉格光栅 光纤电流传感器 

分 类 号：P751.1[交通运输工程—港口、海岸及近海工程]