关键词: 外逸电子, 计数管, 发射机理, 微裂纹, 无损检测

Abstract: In this paper, firstly, taking the ionic crystal and copper for example, the mechanism of exoelectron emission is discussed. It has been pointed out that exoelectrons are low energy electrons emitted from solid surface by the external perturbation or solid itself physicochemistry change. According to the number of exoelectrons which is caught from the metal surface, formation and growth of the metal microcracks or defects can be calculated and forecasted. Secondly, combining with the dosimetry, characteristics of surface and fatigue damage, exoelectrons application in the crack of the wings etc. are studied.Finnaly, the authors developped the electronic control circuit and the mixing power source for exoelectrons detection unit based on the theories of exoelectron emisson and application. The results of experiments show that circuit and power source work smoothly and regulate conveniently.

Key words: exoelectron, counter, mechanism of exoelectron emission, microcrack, nondestructive detection