固体介质相对介电常数测量实验装置的改进

Improvement of Experimental Device for Measuring Relative Dielectric Constant of Solid Medium

摘要: 分析了现有的固体介质相对介电常数测量实验教学仪器存在的一些问题。为解决这些问题，重新设计了实验测量装置。在该装置中，平行板电容的上极板不是由螺旋测微仪带动其上下移动，而是由一限位螺母的转动，带动上极板上下移动。上极板在上下移动过程中不发生转动，极板的大小也不再受设计方案的影响，可以方便的做得更大。用一千分表实时测出上极板上下移动的距离。改进后的实验装置解决了原来结构中存在的一系列问题，提高了实验精度。

Abstract: Some problems are analyzed existing in the teaching instrument for the experiment of measuring the relative dielectric constant of solid media. To solve these problems, the experimental measuring device is redesigned. In the new device, the upper plate of the parallel plate capacitor is not driven by the spiral micrometer to move up and down, but is driven by the rotation of a stop nut. The upper plate does not rotate when it is moving up and down. The size of the plate is no longer affected by the design scheme and can be easily made larger. A micrometer gauge is used for the real-time measurement of the moving distance of the upper plate. The improved experimental de-vice solves a series of problems in the original device and improves the accuracy of the experiment.