高g值加速度计激光干涉校准及信号解算方法

摘要

The high-g accelerometer is calibrated with the Hopkinson bar to generate the input accelerome-ter pulse and the laser interferometer used for the measurement of that exciting acceleration. The zero-cross method and the phase method are presented for the processing of the Doppler signal. The simulating result shows that the phase method is superior to the zero-cross method with the error of 0. 20%, under the SNR of 30dB. A 988-type accelerometer is calibrated with the input acceleration ranging from 18371g_n to 86806g_n, which has justified the efficiency of the calibration apparatus and the method for signal processing.%采用霍普金森杆冲击装置产生激励加速度脉冲,利用激光速度干涉仪对激励信号进行测量,实现对高g值加速度计的校准.提出了过零点法和相位求导法对多普勒信号进行解算.模拟分析结果表明,信噪比为30dB时相位求导法的解算误差为0.20%,优于过零点法.对988型压电式加速度计在18371gn～86806gn的校准实验表明了试验装置和解算方法的有效性.