The Design Of Acceleration Sensor Batch Calibration System

The rapid development of MEMS technology has greatly boosted the development ofaccelerometers industrially. It is not only used in the aerospace, automotive, industrial,agriculture and other industries widely, but also applied to the game handle and mobileelectronics. With the increasing demand for acceleration sensors, the accuracy of theacceleration sensor requirements are also increasing. The acceleration sensors need to becalibrated before used in various trades and industries. The traditional method of operationcalibration test is complexity and it has a low efficiency. In this essay, we design a set ofbatch calibration and test system. According to the principle of calibration, we design aacquisition circuit system for gathering and conversion sensor output voltage, it uploaded tothe host computer through Ethernet. The processing and analysis procedure of voltages are byhost computer, and then drawing through plot points. Finally, the curve fitting algorithmapplied.Firstly, this paper according to the project requirements for batch sensor calibration,apart from this,the sensor calibration method and principle should be consider to design theoverall structure of this system. Its main modules are as follows: flip platform, accelerationsensors, data acquisition module and PC software module. This system has some importantfunction such as multi-channel continuous data acquisition parameter settings, data storageand waveform real-time display, also reflect multi-channel voltage signal. It simplifies theprocess of data acquisition and solve the problem of the loss of data by congestion,elaborated the design of acquisition circuit and compiled PC software.We are introduced in detail the circuit design of the program depending on the hardwarefunctional modules. XC3S400type FPGA chip is the main control unit of the datacollection, it controlled the switch of20-channel Sensor signals acquisition and dataconversion.. Data collected to the computer through transmission module based on W5300Ethernet network cable can achieved multi-channel synchronous parallel sampling and storage. We are introduced in detail the design principle of circuit function modules and howto achieve it. The main circuit design is AD conversion data and Ethernet data transmission.The main software design focused on data acquisition and conversition, this design canachieve hardware circuit communication function. Then we can use calibration algorithms forthe sensors test. Finally, we use the platform for pilot test. The sensors were placed on deskand vibration table flip for flipping, vibration test. We analyzed the test data to check out theperformance of the system. The data errors are within0.8%, the linearity of the cabration datais in more than0.95%.Compared to the traditional single sensor calibration, in this paper, thesystem can calibrate20sensors, improving efficiency by20times. In Compared to traditionaltest,this equipment can improve standardized efficiency and accuracy.