Grating Spectrum Design and Optimization of GMM-FBG Current Sensor

In this study, the performance of a current sensor based on giant magnetostrictive materials (GMM) and fiber Bragg grating (FBG) has been improved by optimizing spectral characteristics gratings. By analyzing influence FBG characteristics, three key parameters (gate region length, refractive index modulation depth, toe cutting system) are selected for optimization. The optimal determined to improve linearity sensitivity output. Experimental tests reveal that after optimization, shows excellent parameters, including 0.9942, 249.75 mV/A, good stability in temperature range 0–60 °C. This research can provide reference improving design existing GMM-FBG sensors.