| Time grating displacement sensor is a high precision sensor developed by our country,and has been widely used in machinery manufacturing,aerospace and other fields.In order to meet the increasing demand for measurement accuracy with the continuous development of various fields,the research and use of more methods to ensure and improve the measurement accuracy of sensors will play a powerful role in promoting the progress of science and technology.At present,calibration is an important procedure for measuring instrument accuracy.It is of great significance to conduct in-depth analysis of calibrated data and find out the error rule and cause in eliminating systematic error and improving instrument measurement accuracy.Moreover,due to the single function and high coupling degree of software and hardware in the current sensor data acquisition system,the update speed cannot keep up with the development of sensors,and it is difficult to meet the requirements of sensors for adaptation systems.Based on this,combining the measuring principle,error characteristics and common error compensation algorithm of time gating displacement sensor,this paper designs and studies the error calibration and analysis system suitable for time gating displacement sensor.The system includes a hardware circuit part of data acquisition and a software part of data processing,data display,data storage,error compensation and warning modules.The main contents and achievements of this paper are as follows:(1)The measuring principle of time grating angle displacement sensor is introduced.The error characteristics are studied,including the principle of multi-probe induction and the distribution characteristics of the whole cycle error curve.The influence of installation horizontal tilt,non-parallel and clearance size on traveling wave signal is analyzed,and the influence of installation clearance is simulated by ANSYS Maxwell.The "dislocation" errors introduced in the process of data acquisition and the influence of errors on the accuracy of compensation model construction are studied.(2)The principle of cubic spline interpolation for reducing calibration error is described.The principle of error compensation algorithm,BP neural network,regression support vector machine,Fourier harmonic error compensation algorithm and the feasibility of each algorithm are studied.(3)The hardware part of error calibration and analysis system of time-gate displacement sensor is designed.Based on the STM32F4 microcontroller,the calibration data acquisition circuit is designed to realize the data acquisition of time grating displacement sensor,the reception of grating signal,the bit transfer solution,the PC communication and other functions.Since SPI master-slave mode is used in this part,it has strong portability.(4)The software of error calibration and analysis system for time grating displacement sensor is designed.Based on C# programming language,the system software is modularized to realize the functions of data processing,data display,data storage,error compensation and warning modules.(5)A test system platform is built to analyze the feasibility of the error calibration and analysis system of time-grid displacement sensor.Analyze the correctness of the received data,compare the algorithm compensation result with the historical data,observe the data visualization,the received data is correct,the compensation result is consistent,and the data visualization is normal.In summary,this paper realizes a set of error calibration and analysis system of timegate displacement sensor,which integrates information technology and error compensation technology,and promotes the development of error data visualization,intelligent error compensation and integrated system. |
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