Purpose

Laboratory calibration methods are time-consuming and require accurate devices to find the error coefficients of the low-cost microelectromechanical system (MEMS) accelerometer. Besides, low-cost MEMS sensors highly depend on temperature because of their silicon property and the effect of temperature on error coefficients should also be considered for compensation. This paper aims to present a field calibration method in which the accelerometer is placed in different positions without any accurate equipment in a few minutes and its temperature is changed by a simple device like a hairdryer.

Design/methodology/approach

In this paper, a non-linear cost function is defined based on this rule that the magnitude of the acceleration measured by the accelerometer in static mode is equal to the gravity plus error factors. Also, the dependency of error coefficients of the accelerometer is presented as a second-order polynomial in this cost function. By minimizing the cost function, the accelerometer error coefficients include bias, scale factor and non-orthogonality and their temperature dependency are obtained simultaneously.

Findings

Simulation results in MATLAB and empirical results of a MPU6050 accelerometer verify the good performance of the proposed calibration method.

Originality/value

Finding a fast and simple field calibration method to calibrate a low-cost MEMS accelerometer and compensate for the temperature dependency without using accurate laboratory equipment can help a wide range of industries that use advanced and expensive sensors or use expensive laboratory equipment to calibrate their sensors, to decrease their costs.

中文翻译：

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无需精密实验室设备即可同时补偿低成本MEMS三轴加速度计的系统误差及其温度依赖性

目的

实验室校准方法非常耗时，需要精确的设备才能找到低成本微机电系统（MEMS）加速度计的误差系数。此外，低成本的MEMS传感器由于其硅特性而高度依赖于温度，因此还应考虑温度对误差系数的影响以进行补偿。本文旨在提出一种现场校准方法，其中将加速度计在几分钟之内放置在不同位置，而无需任何精确的设备，并且通过诸如吹风机之类的简单设备来改变其温度。

设计/方法/方法

在本文中，基于此规则定义了一个非线性成本函数，即加速度计在静态模式下测得的加速度大小等于重力加误差因子。而且，加速度计的误差系数的依赖性在该成本函数中被表示为二阶多项式。通过最小化成本函数，加速度计误差系数包括偏置，比例因子和非正交性，并且它们的温度相关性可同时获得。

发现

MATLAB中的仿真结果以及MPU6050加速度计的经验结果证明了所提出的校准方法的良好性能。

创意/价值

寻找一种快速，简单的现场校准方法来校准低成本的MEMS加速度计并补偿温度依赖性，而无需使用精确的实验室设备，可以帮助使用先进且昂贵的传感器或使用昂贵的实验室设备来校准其传感器的各种行业，降低成本。