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Data acquisition and signal process system design in the distributed optical fiber vibration sensing system

LI Caihua,TENG Yuntian,LI Xiaojun(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)  
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.
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