Research And Implementation Of Calibration Technology Of High-precision Time Interval Measuring Instrument

The application of time interval measurement technology is very extensive.It has important applications in many fields such as military defense,aerospace,geological mapping,satellite launching and monitoring,laser ranging,time synchronization and timing,and high-energy physics research.Since the research results in this direction can promote technological progress in related application fields,research on this technology has been carried out at home and abroad.Through the comparative study of various methods,based on the electronic counting method,the second measurement using the voltage-time conversion method based on the ± 1 principle error is a typical high-precision time interval measuring instrument design method.However,there are also some problems with this method: On the one hand,when using the voltage-time conversion method,because the temperature affects analog devices such as capacitors,op-amps,and A / D converters,the measurement accuracy is affected by the ambient temperature,reducing the reliability of the equipment.On the other hand,the current equipment using this method is relatively large and cannot meet the needs of actual engineering.The research purpose of this article is to design a miniaturized high-precision time interval measuring instrument that is not affected by the ambient temperature in response to the above problems.The work of this article is as follows:1)In order to solve the effect of temperature on the measurement accuracy of the device,this paper analyzes the voltage-time conversion method,and uses the automatic calibration technology for the time interval measurement based on time-voltage conversion method.In the instrument.The time interval measuring instrument using self-calibration technology can detect the influence of factors such as external ambient temperature and system aging on measurement accuracy,and can generate calibration data for calibration when environmental factors change.2)In order to solve the problem of the large size of the traditional time interval measurement system,the MAX 10 FPGA with analog-to-digital converter is used as the control chip,and the whole measurement process can be completed by only a small number of analog components.On the Quartus II 18.1 platform,using the Verilog HDL hardware development language,the top-down design method is used to design the phase-locked loop of the time interval measuring instrument,the measuring circuit,the automatic calibration circuit,and the NIOS II module.Logical layout.After completing the comprehensive design,the RTL-level simulation experiment was performed using Model Sim 10.1 software.In the Eclipse integrated development environment,the internal NIOS II kernel is programmed in C language.Finally,the layout and configuration files are downloaded to the FPGA hardware,and the instrument is tested and analyzed with the atomic clock output frequency.Experiments show that the time interval measurement system using automatic calibration technology is not affected by external temperature and can obtain high-precision measurement results.The time interval measurement system can reach the order of a hundred picoseconds,with high system resolution,and the designed measurement circuit has the characteristics of miniaturization,easy integration,strong portability,and flexible use.