| Facing the development trend of high voltage,high current and intelligent,the safe and reliable operation of power network is facing new challenges.In recent years,a kind of sensor which can measure the change of the magnetic field around the transmission line has been developed rapidly.However,the traditional magnetic field measurement instrument is difficult to meet the requirements of the measurement of the dynamic magnetic field.Based on the original magnetic field measurement on the basis of theoretical research,put forward a kind of based on Giant magnetostrictive Material(GMM)of the Fiber Bragg Grating(FBG)method for 3D magnetic field measurement sensor,the main research work includes:The sensing principle and transmission characteristics of FBG and GMM are comprehensively analyzed,and the sensing model of GMM-FBG magnetic field sensor is established.In this paper,an improved Preisach hysteresis model is proposed for the hysteresis nonlinearity of GMM-FBG magnetic field sensor.The genetic algorithm is used to identify the parameters of the hysteresis model,which improves the prediction accuracy of the model.Design of 3D magnetic field of GMM-FBG sensor,the corresponding design and detailed calculation of structure parameters of 3D GMM-FBG sensor;established the GMM-FBG finite element analysis model,using Finite Element Analysis(FEA)effect on the sensing properties of adhesive parameters,package form and different magnetic field on the finite element model.The stress field was analyzed,and the corresponding optimization parameters,improve the measurement accuracy of GMM-FBG sensor.The experimental platform of the sensing system is designed and built,and the improved Preisach model is verified by experiments.And the center wavelength of the three-dimensional sensing probe was calibrated,at the end of the GMM-FBG 3D sensor error analysis and correction,calibration models were established using improved genetic algorithm to identify the parameters of the correction model is established,simulation and experimental results verify the correctness and effectiveness of error correction is. |
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