| D-dot probe is a key device for performance evaluation and diagnosis of large pulsed power devices.The consistency between the actual performance of the probe developed at this stage and the theoretical value is poor.There are a lot of repetitive work in the probe calibration process,resulting in a great waste of human and scientific research resources in large-scale application.This paper focuses on the probe structure design,combined with the uncertainty analysis in the application process,studies the methods to improve the probe performance consistency and measurement accuracy.Firstly,a D-dot probe structure is designed according to the service environment and performance requirements.The frequency response performance and sensitive structural parameters of the probe are selected through software simulation.The influence of the errors of key structural parameters of the probe within a reasonable tolerance range on the frequency response performance and sensitivity coefficient of the probe is analyzed.Secondly,combined with the simulation results and engineering practice,the tolerance standard of probe structural parameters is formulated,the process and assembly requirements of components are put forward,and the structural template and processing technical specifications of this kind of probe are formed.The frequency response and sensitivity coefficient of the probe were tested according to the technical specifications.The experimental results show that the sealing performance and high frequency performance of the probe meet the measurement requirements of water medium pulse transmission line,and the difference between the actual sensitivity of the probe and the theoretical design value is less than 1%.Finally,the uncertainty factors related to the application environment of the probe are studied,including the influence of the traditional calculation model,the eccentricity of the inner cylinder of the transmission line,the temperature difference in the service environment and the water medium resistivity of the transmission line on the measurement performance of the probe,which lays a foundation for further improving the accuracy and stability of the probe measurement. |
