Method and device for improving accelerometer calibration accuracy

Abstract

The invention provides a method for improving accelerometer calibration accuracy. The method comprises the steps that a servo table on a linear acceleration simulation rotary table is positioned at the zero position, the output accelerated speed of the linear acceleration simulation rotary table is made to have a plurality of preset acceleration values, and the output value of an accelerometer fixed to the servo table is obtained; the servo table on the linear acceleration simulation rotary table is positioned at 180 degrees, the output accelerated speed of the linear acceleration simulation rotary table is made to have a plurality of preset acceleration values, and the output value of the accelerometer fixed to the servo table is obtained; according to the formula, the error of the installation positions of the accelerometer on the linear acceleration simulation rotary table is obtained. The invention further provides a device for improving accelerometer calibration accuracy. Working radius error influences of the accelerometer can be eliminated, and calibration accuracy can be improved.

Description

technical field [0001] The invention relates to the technical field of accelerometers, in particular to a method for improving the calibration accuracy of the accelerometer and a device for improving the calibration accuracy of the accelerometer. Background technique [0002] Accelerometers are widely used in vibration detection, motion recognition, status recording, and automotive airbags. In the development, production and use of the accelerometer, the performance of the accelerometer needs to be calibrated. The performance indicators of the accelerometer within ±1g can be tested by using the gravity field 1g rollover test, but the measurement range is limited within ±1g. [0003] The linear acceleration simulation turntable can simulate standard dynamic acceleration, such as sinusoidal acceleration, and the amplitude of the acceleration is determined by the angular rate and working radius of the linear acceleration simulation turntable. The angular rate of the servo tab...

AI Technical Summary

Problems solved by technology

[0006] The actual installation cannot avoid the installation error, which affects the calibration accuracy of the accelerometer, and because the shape and size of various types of accelerometers vary greatly, most of the installation fixtures need to be customized according to the specific shape and size of the accelerometer, so , Accelerometers of different shapes and sizes may produce inconsistent working radius errors during installation

[0007] Based on the above reasons, when the accelerometer is installed, the installation error is inevitable, that is to say, the data obtained by the test contains the error term caused by the working radius error. If the error term is not considered, the first-order If the relevant performance indicators of the accelerometer are calculated by fitting or other methods, it will affect the accuracy of the indicator test

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