Abstract
For linear accelerometers, calibration with a precision centrifuge is a key technology, and the input acceleration imposed on the accelerometer should be accurately obtained in the calibration. However, there are often errors in the installation of sample that make the calibration inaccurate. To solve installation errors and obtain the input acceleration in the calibration of the accelerometer, a calibration method based on the rotation principle using a double turntable centrifuge is proposed in this work. The key operation is that the sub-turntable is rotated to make the input axis of the accelerometer perpendicular to the direction of the centripetal acceleration vector. Models of installation errors of angle and radius were built. Based on these models, the static radius and input acceleration can be obtained accurately, and the calibration of the scale factor, nonlinearity and asymmetry can be implemented. Using this method, measurements of the MEMS accelerometer with a range of ±30 g were carried out. The results show that the discrepancy of performance obtained from different installation positions was smaller than 100 ppm after calibrating the input acceleration. Moreover, the results using this method were consistent with those using the back-calculation method. These results demonstrate that the effectiveness of our proposed method was confirmed. This method can measure the static radius directly eliminating the installation errors of angle and radius, and it simplifies the accelerometer calibration procedure.
Highlights
Accelerometers are widely used in the consumer electronics, automotive, industry and military fields to measure inclination, acceleration and vibration [1,2]
The static radius error caused by installation makes it difficult to accurately obtain the acceleration about sensor input axis, which is called input acceleration, that leads to calibration error [13,14,15]
To solve installation errors in the calibration of the accelerometer, this paper proposes a calibration method for accelerometer using a double turntable centrifuge
Summary
Accelerometers are widely used in the consumer electronics, automotive, industry and military fields to measure inclination, acceleration and vibration [1,2]. Calibration is a key technology [3,4]. Calibrating the scale factor, asymmetry, nonlinearity and range using a precision centrifuge is an indispensable process for the accelerometer [10,11,12]. The static radius error caused by installation makes it difficult to accurately obtain the acceleration about sensor input axis, which is called input acceleration, that leads to calibration error [13,14,15]. Obtaining accurate installation and input acceleration are important and difficult issues in the calibration of the accelerometer using a precision centrifuge [16,17]
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