研究目的
To study the working characteristics of the optical fiber current transformer based on the Terfenol-D material, including the design of a fiber Bragg grating current transformer and the analysis of its working characteristics under different prestressing forces and bias currents.
研究成果
The improved magnetic-thermal-force coupling nonlinear hysteresis model of Terfenol-D material can more accurately reflect the magnetostrictive characteristics of Terfenol-D rod under the coupling of stress, temperature and magnetic field. The fiber Bragg grating current transformer with Terfenol-D material can measure AC current with different amplitudes by changing the prestressing force and bias current.
研究不足
The model's description of magnetostrictive characteristics of Terfenol-D materials under different prestress is not accurate, especially in the middle and low magnetic field region.
1：Experimental Design and Method Selection:
A nonlinear hysteresis model of magneto-mechanical-thermo coupling for Terfenol-D materials was established. A fiber Bragg grating current transformer was designed based on the strain sensing mechanism of fiber Bragg grating and the demodulation principle of unbalanced M–Z interferometer.
2：Sample Selection and Data Sources:
A Terfenol-D rod with a length of 18 mm and diameter of 8.4 mm was used in the experiment.
3：4 mm was used in the experiment.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The experimental device was mainly composed of four parts: the magnetic material characteristic test system (multiparameter magnetic measurement system), gas pressure loading system, intelligent temperature control system, and fiber grating sensing system.
4：Experimental Procedures and Operational Workflow:
The magnetostrictive characteristics of Terfenol-D and the fiber Bragg grating AC current transformer under different stress and temperature were studied.
5：Data Analysis Methods:
The relationship between the output of the transformer and the current to be measured was analyzed under different bias currents and prestresses.
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