GMM-FBG Alternating Current Sensor Based on Free Energy Model

Abstract

The invention relates to the field of optical current sensors, in particular to a GMM-FBG alternating current sensor based on a free energy model. The calibration method includes the following steps, 1. Design the driving model of the GMM-FBG AC current sensor; 2. Determine the relationship between the input current and the magnetic field strength; 3. The GMM material undergoes stretching strain, and determine the relationship between the strain of the giant magnetostrictive material and the magnetic field strength ; Step 4, hysteresis loss occurs in GMM, and the dynamic Smith free energy model is designed to determine the relationship between magnetic field intensity and magnetic induction intensity in the GMM material, and its modeling compensation; Step 5, the center wavelength of the FBG bonded to the GMM surface deviates shift, determine the relationship between the magnetic induction intensity and the wavelength shift; step 6, determine the relationship between the sensor model FBG center wavelength shift and the measured current, identify model parameters, and optimize the model. The invention can be used for dynamic current measurement, and the sensor has a wide range of applications.

Description

technical field [0001] The invention relates to the field of optical current sensors, in particular to a GMM-FBG alternating current sensor based on a free energy model. Background technique [0002] With the rapid development of power networks in today's era, current sensors play an increasingly important role in realizing accurate measurement and monitoring of current. The traditional current measurement technology based on electromagnetic current transformers has been difficult to meet the measurement and monitoring needs of current high-current, high-voltage and high-power power systems. Optical current transformers are characterized by good insulation performance, small size, passive The advantages of devices have become a research hotspot in current measurement technology. [0003] So far, the research on optical current transformers is mainly divided into three types: one is the current transformer derived from the Faraday principle, the other is the current transfor...

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Problems solved by technology

[0004] As the core component of the sensor, GMM is prone to magnetic saturation when it exceeds a certain magnetic field range. Too high a signal frequency will have a greater impact on the magnetoelastic dynamic effect, eddy current effect and hysteresis effect of giant magnetostrictive materials. It adds complexity and high measurement error to the sensor system that needs to respond quickly to changes in the external magnetic field. It needs to be modeled and analyzed to predict and compensate

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