分布式光纤振动传感系统中数据采集及信号处理系统设计
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摘要
本文主要介绍了一套分布式光纤振动传感系统中的数据采集及信号处理系统,该系统设计采用高性能的运算放大电路完成光电信号调理,以高精度差动模数转换器AD9246完成模数转换工作,并选用高性能FPGA作为核心逻辑控制器,并以低功耗的OMAP-L137作为CPU负责振动数据计算、网络通讯等工作,从而使该-OTDR分布式光纤振动传感系统测量范围扩展到25 km范围。本文通过计算相邻测点振动增量方法检测是否发生了振动入侵,提高了分布式光纤振动入侵检测的灵敏度。该设计方法提高分布式光纤振动传感系统的信噪比,使得该系统振动检测灵敏度提高、抗干扰能力增强,因此该分布式光纤振动传感系统可以用于实际工程的振动监控。
This paper introduces a data acquisition and signal processing circuit of the distributed optical fiber vibration sensing system.In this system,one high performance operational amplifying circuit is adopted to modulate the photoelectric signal.One high-precision differential analog-to-digital convertor AD9246 is used to undertake the data conversion.A super FPGA XC6VLX365 works as the core logical controller.And the low power ARM chip OMAP-L137 fulfills the vibration data computation,network communication,etc.So the measurement range of the -OTDR distributed optical fiber vibration sensing system can be expanded to 25 km.The new vibration increment computation method of adjacent measurement point is used to detect the vibration intrusion and it gets a high vibration detection sensitivity in the distributed optical fiber vibration sensing system.This design method has significantly improved the signal-to-noise of the distributed optical fiber sensing system.So the vibration detection sensitivity and the anti-interference performance are improved.Then the distributed optical fiber sensing vibration system could be used in vibration monitoring of actual civil engineering.
This paper introduces a data acquisition and signal processing circuit of the distributed optical fiber vibration sensing system.In this system,one high performance operational amplifying circuit is adopted to modulate the photoelectric signal.One high-precision differential analog-to-digital convertor AD9246 is used to undertake the data conversion.A super FPGA XC6VLX365 works as the core logical controller.And the low power ARM chip OMAP-L137 fulfills the vibration data computation,network communication,etc.So the measurement range of the -OTDR distributed optical fiber vibration sensing system can be expanded to 25 km.The new vibration increment computation method of adjacent measurement point is used to detect the vibration intrusion and it gets a high vibration detection sensitivity in the distributed optical fiber vibration sensing system.This design method has significantly improved the signal-to-noise of the distributed optical fiber sensing system.So the vibration detection sensitivity and the anti-interference performance are improved.Then the distributed optical fiber sensing vibration system could be used in vibration monitoring of actual civil engineering.
引文
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[2]李建中,饶云江,冉曾令,等.基于ф-OTDR和POTDR结合的分布式光纤微扰传感系统[J].光子学报,2009,5:1108-1113.LI Jianzhong,RAO yunjiang,RANG Zengling,et al.A distributed optical fiber perturbation sensor system base on combination ofф-OTDR andPOTDR[J].ACTA photomica sinica,2009,38(5):1108-1113.(in Chinese)
[3]Juarez J C,Maier E W,Choi K N,et al.Distributed Fiber-optic intrusion sensor system[J].Lightwave Technology,2005,23(6):2081-2087.
[4]戚风云,赵乐军,周又铃.分布式光纤测温系统及高速数据采集与处理[J].传感器技术,2005,24(11):62-64,67.QIN Fengyun,ZHAO Lejun,ZHOU Youling.Distributed optical fiber temperature measurement system and its high-speed data acquisition andprocessing[J].Journal of Transducer Technology,2005,24(11):62-64,67.(in Chinese)
[5]李宏男,李东升,赵柏东.光纤健康监测方法在土木工程中的研究与应用进展[J].地震工程与工程振动,2002,22(6):76-83LI Hongnan,LI Dongsheng,ZHAO Bodong.Progress in study and application in smart health monitoring method by optic fiber sensor in civil engi-neering[J].Journal of Earthquake Engineering and Engineering Vibration,2002,22(6):76-83.(in Chinese)
[6]瞿伟廉李卓球.姜德生,等.智能材料—结构系统在土木工程中的应用[J].地震工程与工程振动,1999,19(3):87-95.QU Weilian,LI Zhuoqiu,JIANG Desheng,et al.Application of intelligent material structure system in civil engineering[J].Journal of EarthquakeEngineering and Engineering Vibration,1999,19(3):87-95.(in Chinese)
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