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《Optical Fiber & Electric Cable and Their Applications》 2007-04
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A Novel Current Sensor System Utilizing FBG F-P Interferometer

CHEN Chao,ZHOU Wang-min,ZHANG Hao,XU Meng,ZHANG Xiao-juan(Institute of Optical Information Science and Technology,School of Science,Northwestern Polytechnical University,Xi'an 710072,China)  
Based on the magnetostrictive effect and F-P interferometer principle, the traditional intracavity fiber optic F-P sensor is improved,and a novel fiber optic current sensor is realized through fabricating two FBGs with fully same parameters on a single optical fiber as the two reflecting faces of an F-P cavity.Different from traditional fiber optic sensors based on F-P interferometer,this kind of sensor carries out current strength measurement through measuring the variation frequency of light-intensity(numerical value) instead of using light-intensity as direct measured value,so that relatively large error is avoided in the direct measurement of analog signal,thereby leading to stronger anti-interference ability and stability for the sensor.The operation principle of the sensor is analyzed first,then the design scheme for the sensor system is given,and finally the system is verified through demonstration.It is shown that when the alternative current varies between 0~3 A,the experimental data are well coincident with the calculation results from theoretical formulas.
【Fund】: 西北工业大学研究生创业种子基金资助项目(Z2000660)
【CateGory Index】: TP212.1
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