Research on character and modeling method of noise in fiber optic current transducer(FOCT)
LU Yu-ping · Power System Protection and Control · 2011
Focusing on the problem of random noise in fiber optic current transducer(FOCT),this paper discusses systematically the noise category,influencing factors on noise,and methods of restricting noise based on the structure and principle of FOCT by reference of fiber optic gyroscope(FOG).Noise in FOCT shows different time domain coherence and various frequency domain features.According to the character,different types of noise are identified and quantified by introducing Allan variance and modeling theory to FOCT noise analyzing system,and FOCT performance is evaluated comprehensively.Results of Allan variance and modeling theory used in FOCT data processing show that FOCT output data display different random noises such as angle random walk,bias instability,etc.At the same time,the feasibility of Allan variance theory used in analyzing and modeling FOCT noise is proved.