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| Calibration of Low Frequency Accelerometer Based on the Earth‘s Graviation Method |
| YANG Ming1,ZHAO Huan-xing2,LIU Zhi-hua3,LI He-jia4,CAI Chen-guang3 |
1. The Electrical Engineering College, Guizhou University, Guiyang, Guizhou 550025, China
2. Unit 32382 of PLA, Wuhan, Hubei 432200, China
3. National Institute of Metrology, Beijing 100029, China
4. Inner Mongolia Institute of Metrology Testing and Research, Hohhot, Inner Mongolia 010050, China |
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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.
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Received: 05 February 2021
Published: 20 August 2022
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2022, Vol. 43 
