The Software Design Of Calibration System Of MEMS Accelerometer

With the rapid development of MEMS acceleration sensor, MEMS acceleration sensors are widely used in various fields. Our daily use of mobile phone, game handle, iPad, car navigation, SRS, and even a lot of military equipments need MEMS acceleration sensor. The accuracy of the accelerometer needs to be improved, which requires an efficient calibration system for accelerometer. A good hardware system is built, and must need a good MEMS acceleration sensor software to interact with. Only in this way, can we meet the requirements of MEMS accelerometer calibration.This article comes from the 863 item “Development and application of a typical micro and nano sensor multi parameter batch test equipment with environmental control function”.This paper mainly introduces the calibration principle of acceleration sensor and the design of the software of calibration system, and the method of using the batch MEMS acceleration sensor test platform for the integration of the Temperature, humidity, vibration rollover test platform, the software control section of the rollover test platform is described in detail.Through the serial port to control the hardware, which based on DSP. By defining the data frame format, the different control behaviors of different instructions are distinguished and completion of the tilt sensor angle display and other operations.According to the demand of the static calibration method of the acceleration sensor based on the eight position method of the gravity field. In this paper, the angle of the display, the angle precision and the control turnover test platform are adjusted by the display of the data.Finally, according to the requirement of the dynamic and static calibration method of the sensor, explain the principle of data collection, the storage method and the analysis method of static dynamic data. The least squares method is used to perform linear fitting. Find the best sensitivity and linearity. In the dynamic data analysis, the comparison between the original data waveform display and the oscilloscope is provided to verify the accuracy of the software.The frequency sweep experiment data of fixed acceleration is analyzed. At last, the design ofacceleration sensor calibration system software is completed.