基于谐波分析确定加速度计相移方法的研究与试验  

Study and Verification for Determination Phase Lag of Accelerometer Using Harmonic Analysis

作　　者：胡红波[1] 于梅[1] 

机构地区：[1]中国计量科学研究院,北京100013

出　　处：《测试技术学报》2015年第4期321-325,共5页Journal of Test and Measurement Technology

基　　金：国家重大科学仪器设备开发专项资助项目(2012YQ09020804)

摘　　要：论述了一种基于分析绝对法振动激光干涉信号谐波相位确定加速度计相移校准的方法.该方法以绝对法振动校准为基础,以正交输出的零差干涉仪为测量装置,通过直接对一路正交信号进行FT变换,在频域分解成无限个n次谐波,每个谐波的相位是主相位的n倍,选择合适的谐波次数,利用最小二乘法计算出主相位的值.通过仿真与校准试验,与正弦逼近法一致的校准结果证明了该方法的可靠性.本文所述方法的计算简单高效,是校准加速度计相移特性的一种有效的方法.A method to determination phase shifting of accelerometer based on primary vibration calibration is proposed in this paper.The method was built on the primary vibration calibration.the measuring device is homodyne interferometer with quadrature output.Assuming the accelerometer is under sinusoidal excitation,we have Fourier transformed the interference signal directly.The interference signal in the frequency domain can be expanded into a series of infinite harmonic components with orders of n,We find the principal phase through choosing proper harmonic components with orders of n and using least-squares method.Simulation and experimental results showed good agreement with sine-approximation method,thus verifying the validity of the approach.For its simplicity and efficiency,the proposed method is an effective way for estimation phase shifting of accelerometer.

关 键 词：计量学 绝对法振动校准 相移特性 谐波成分 零差干涉仪 

分 类 号：TM930[电气工程—电力电子与电力传动]