基于地球重力法的低频加速度计校准

doi:10.3969/j.issn.1000-1158.2022.08.14

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摘要 ISO 16063-16描述的地球重力法只能用于低频加速度计灵敏度幅值静态校准, 无法用于灵敏度幅值与相位的动态校准。采用机器视觉方法测量激励加速度相位,并得到对应时刻的加速度计输出信号相位,该方法可同时实现基于地球重力法的灵敏度幅值与相位动态校准。该方法测量时由转台为被校加速度计提供峰值恒定为1g的正弦激励加速度,有效避免了低频时微小激励加速度引起的加速度计输出低信噪比信号对校准精度的影响。实验结果表明,地球重力法可实现从静态(DC)至10Hz范围内的灵敏度幅值与相位高精度校准。

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	杨明
	赵焕兴
	刘志华
	李贺佳
	蔡晨光

关键词 ：计量学, 低频加速度计, 振动校准, 正弦激励, 地球重力法

Abstract：The earth gravity method described in ISO 16063-16 can only be used for static calibration of low-frequency accelerometer sensitivity amplitude, and cannot be used for dynamic calibration of sensitivity amplitude and phase. The machine vision method is adopted to measure the phase of the excitation acceleration and determine that of the output signal of the accelerometer at the corresponding time, and the dynamic calibration of sensitivity magnitude and phase based on earth’s graviation method is accomplished. The rotator provides the excitation acceleration with a constant peak 1g for the accelerometer, which efficiently avoids the influence of the output low SNR of the accelerometer caused by the limited excitation acceleration on the calibration accuracy. Experimental results show the investigated earth’s graviation method can achieve the high-accuracy sensitivity magnitude and phase calibration in the range from DC to 10Hz.

Key words： metrology low frequency accelerometer vibration calibration sinusoidal excitation earth&rsquo s graviation method

收稿日期: 2021-02-05 发布日期: 2022-08-20

PACS:

TB936

基金资助:国家重点研发计划(2017YFF0205003);质量技术监督能力提升专项(ANL1820)

通讯作者: 蔡晨光(1978-), 男, 内蒙古乌兰察布人, 中国计量科学研究院副研究员, 硕士生导师,主要从事振动计量与测试的研究。Email: caichenguang@nim.ac.cn E-mail: caichenguang@nim.ac.cn

作者简介: 杨明(1990-), 男(土家族), 贵州铜仁人, 贵州大学讲师, 硕士生导师, 主要从事机器视觉检测及振动计量的研究。Email: Yang_M1230@yeah.net

引用本文:

杨明,赵焕兴,刘志华,李贺佳,蔡晨光. 基于地球重力法的低频加速度计校准[J]. 计量学报, 2022, 43(8): 1064-1069.
YANG Ming,ZHAO Huan-xing,LIU Zhi-hua,LI He-jia,CAI Chen-guang. Calibration of Low Frequency Accelerometer Based on the Earth‘s Graviation Method. Acta Metrologica Sinica, 2022, 43(8): 1064-1069.

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