基于激光多普勒原理的超高冲击加速度校准系统

Ultra-high shock acceleration calibration system based on laser Doppler principle

超高冲击加速度传感器在武器研制、航空航天等高过载测量中发挥了重要的作用,为解决超高冲击加速度的校准问题,基于激光绝对法,建立了超高冲击加速度校准系统。本文介绍了系统的组成和优化方案,设计了合适的解调程序和滤波算法,对原始多普勒信号进行解调,实现了冲击加速度峰值1×104g~2.5×105g,脉宽20~50μs范围内半正弦冲击波形的绝对复现。最后对影响测量结果的不确定分量进行评定,超高冲击加速度测量不确定度为8%,对2×105g以上冲击加速度校准具有重要意义。

Ultra-high shock acceleration sensor plays an important role in weapon development,aerospace and other high overload measurements.Based on the primary calibration by laser interferometry,an ultra-high shock acceleration calibration device is established to calibrate the high shock acceleration.The composition and design optimization of the system are introduced.A suitable demodulation program and filtering algorithm are designed to demodulate the original Doppler signal.In the range of peak shock acceleration of 1×10~4 g~2.5×10~5 g and shock pulse width of 20~50μs,the semi-sinusoidal shock waveform is absolutely reproduced.Finally,the uncertainty components affecting the measurement results are evaluated.The measurement uncertainty of ultra-high shock acceleration is 8%,which is of great significance for the calibration of shock acceleration above 2×10~5 g.