激光干涉法一次冲击加速度校准

梁志国 李新良 连大鸿
长城计量测试技术研究所计量与校准国家重点实验室,北京100095
摘　要:介绍了利用激光光栅干涉技术进行冲击加速度校准的一种方法，将冲击加速度直接绝对溯源于基本量和单位（时间和长度）。对差动式光栅激光干涉冲击校准装置的原理作了介绍，特点是使用冲击激励，通过光栅的栅距、衍射级数、激光波长及激光的多普勒频移来最终确定冲击速度和加速度的瞬时值。使用了调频信号的一种数字化解调方法实现多普勒频移数据的处理，时间分辨力为一个采样间隔，具有鲁棒性好、过程收敛、结果精确等特点。应用滑动最小二乘拟合直线段的方法实现微分运算，获得了冲击速度和加速度的瞬时测量结果，并给出了实验结果。[著者文摘]

Primary Shock Calibration Using Laser InterferometryLiang Zhiguo,Li Xinliang,Lian Dahong National Laboratory of Metrology ＆ Measurement of Changcheng Institute of Metrology ＆ Measurement, Beijing 100095, ChinaAbstract:An accelerometer shock calibration method by using grating laser interference technique is described in this paper. The shock acceleration value is directly and absolutely acquired from the basic quantity and unit （time and length）. The principle of the differential grating laser interferometer shock calibration device are introduced. Its characteristic is through impulse stimulation by using the grating width, diffraction series, laser wavelength, and the Doppler frequency shift to determine the shock velocity and the shock acceleration instantaneous value. By employing a frequency demodulation method of FM signal, the Doppler frequency shift of laser is gained, the time resolution of this method is just one sampling period, and both the Robust and convergent of this method are excellent, its precision is good enough. By using movement least square beeline segment, the paper realized the differential operation, and obtained the shock velocity and the shock acceleration instantaneous value. Finally, an experimental result is given.[著者文摘]

Key words:metrology, grating laser interferometer, shock calibration frequency demodulation.