改进的零差时间间隔法振动幅相特性校准技术

Investigation of Primary Vibration Calibration by a novel Homodyne Time Interval Analysis Method

详细描述了一种改进的基于虚拟仪器技术的时间间隔法。按照该方法建立的振动幅相特性校准系统,使用普通迈克耳孙激光干涉仪和双通道同步数据采集卡,能够在800 Hz频率范围内实现加速度传感器复灵敏度的精确校准,满足相关国际标准的不确定度指标要求,幅值不确定度0.5%,相移不确定度1°(k=2)。利用加速度仿真试验和振动标准套组比对试验,验证了该改进方法的正确性,并对其相关特性进行了较深入的分析。改进的时间间隔法具有软件算法简单高效、硬件平台通用经济的优势,尤其适于在发展中国家的计量院和国内的激光绝对法振动校准实验室推广应用。

A novel homodyne time interval analysis （TIA） method is proposed with the help of virtual instrument technology. Equipped with an ordinary Michelson interferometer and dual-channel synchronous data acquisition card, the primary vibration calibration system using the novel method can perform measurements of complex sensitivity of accelerometers accurately, meeting the uncertainty requirements lald down in the related ISO standard. The validity and accuracy of the novel TIA method is verified by simulation and comparison experiments. This novel method is recommended to apply in national metrology institute of developing countries and domestic primary vibration calibration labs for its simplicity in algorithm and low requirements on hardware.