Sensitivity Matrix Calibration of Triaxial High-G Accelerometer Based on Triaxial Shock Calibration Device

This article presents a sensitivity calibration method aimed at minimizing installation, misalignment, and measurement errors, as well as reducing the mutual coupling interference of the sensitive axes of the accelerometer. The proposed method is based on a triaxial shock calibration device consisting of three orthogonal Hopkinson bars and relies on a measurement array of three laser Doppler velocimeters (LDVs). Based on the triaxial shock calibration device, we propose using three sensitivity matrices to characterize the three sensitive axes of the accelerometer. The experimental results show that this method achieves an average relative error of 3.2% and a maximum relative error of 8.1% in solving the excitation acceleration. This method significantly outperforms the other two methods that use a single sensitivity matrix. The results demonstrate the high calibration accuracy and reliability of the proposed method.