Research On Dynamic Characteristics And Uncertainty Evaluation Of Pressure Sensor Based On Sinusoidal Calibration System

With the development of social economy and science and technology,the dynamic pressure measurement is increasingly required in the fields of science and technology research and engineering practice,and the change process and law of transient pressure in dynamic measurement are further explored.The core of the pressure dynamic test system is the pressure sensor.Its dynamic characteristics and dynamic measurement uncertainty determine the performance and data accuracy of the whole test system.This paper mainly studies the dynamic characteristics and dynamic measurement uncertainty of the pressure sensor based on the sinusoidal pressure dynamic test calibration system.The specific research contents are as follows:(1)the main sinusoidal pressure dynamic calibration experiment platform is studied,the experimental system is mainly composed of the control part,sinusoidal pressure generator and the test system,etc,the control part includes the pressure control system and the sinusoidal signal frequency control system,test system including reference is sensors,sensor,a signal disposal for the school,as well as the data acquisition system.Then the mechanism of sinusoidal pressure signal generated by the main engine of sinusoidal pressure generator is studied in depth.For PCB company 113B27 series piezoelectric pressure sensor as the calibrated sensor calibration experiments,are the same incentives to get this by sinusoidal pressure sensor and the reference sensor feature comparison,in the same pressure,under the condition of different frequency point,be school pressure sensor of waveform distortion degree,its value in the 0.4 Hz was 36.43%,0.73% at 1 KHz.The change rule of pressure peak-to-peak ratio with frequency is obtained.(2)in order to study the evaluation and analysis of dynamic measurement uncertainty of pressure sensor within the working range of low and medium frequency,this paper combined error theory,GUM method and gray theory system to conduct a comparative study on dynamic measurement uncertainty of pressure sensor.Of grey system theory for pressure sensor uncertainty evaluation steps including the characteristics of the data sequence of gray deviation accumulation generation,establishing grey model GM(0,2)get gray coefficient c,calculating grey correlation degree Y weight coefficient,finally the application of the above steps to get grey of skewness,combined with weight coefficient weighted least-squares fitting,get the pressure sensor dynamic measurement uncertainty curve model.(3)through the error analysis and uncertainty propagation rule research of the sinusoidal pressure dynamic experimental system,the uncertainty of several calibration frequency points in the calibration system of the calibration device is analyzed and evaluated,and the results are relatively consistent with small changes.By using GUM method and error theory,the dynamic measurement uncertainty of the pressure sensor is evaluated and compared with the gray evaluation of the sensor uncertainty.At the designated calibration frequency point,the difference between the two methods is about 0.001.Finally,the experimental procedures are summarized and the software implementation of the uncertainty calculation is completed.By grey evaluation of the uncertainty of pressure sensor,the variation trend of the uncertainty of pressure sensor in the working range of low and medium frequency is obtained.Moreover,the difference between the two methods is within the acceptable range,which proves that the grey theory system is effective and feasible to evaluate the uncertainty of the pressure sensor.