一种基于残周期拟合的激光测冲击信号解调方法  

A Novel Demodulation Method Based on Partial Period Curve-fitting for FM Signal in Impulse Acceleration Calibration by Using Laser Interference Methods

作　　者：梁志国[1] LIANG Zhi-guo(National Key Laboratory of Science and Technology on Metrology&Calibration,Changcheng Institute of Metrology and Measurement,Beijing 100095,China)

机构地区：[1]北京长城计量测试技术研究所计量与校准技术重点实验室,北京100095

出　　处：《计量学报》2021年第4期503-510,共8页Acta Metrologica Sinica

摘　　要：针对激光干涉法冲击加速度校准中调频信号的数字化解调问题,提出一种基于残周期正弦波拟合的解调方法,使用约1/5周期的残周期正弦波模型进行滑动拟合,实现FM信号的数字化解调,对激光多普勒冲击信号波形具有良好的适应性,无需信号的截取等操作,拥有良好的算法稳定性和一个采样间隔的时间分辨力。在一组实际测量波形上的实验,验证了所述方法的正确性与可行性,为冲击加速度的计算提供了另外一种有效实用的数据处理方式。上述方法也可用于外差式激光干涉振动信号的解调。Aiming at the FM signal demodulation in impulse acceleration by using laser interference methods,a novel demodulation method are introduced.It is based on the partial sinusoidal period series curve-fitting,by using about 1/5 period sine wave model s moving and curve-fitting,the 4 sine wave parameters are gotten,and the FM demodulation be realized.To the impulse laser interference Doppler signals,it has an excellent adaptability,there is no need curve cutting operation,filtering,and so on,the demodulation resolution is one sampling period,and it has well stability.In experiment,the validity and feasibility are proved,and it must be a novel processing method of impulse acceleration signals by using laser interference methods.The method above can also be used in demodulation of vibration wave form of laser interference Doppler signals.

关 键 词：计量学 冲击加速度 残周期正弦波 曲线拟合 调频 解调 校准 

分 类 号：TB936[一般工业技术—计量学] TB973[机械工程—测试计量技术及仪器]