Abstract:

Exoelectrons are low energy electrons delayed emission from solids surfaces. The accumulation of fatigue damage of the metallic materials would result in exoelectrons emission. The accurate detection of the number of exoelectrons of formation and development of microcracks depends on the precision of the electron sensor. In this paper, the relationship between exoelectrons emission and the fatigue damage microcracks of metallic materials is studied. The design scheme of a new type electron sensor DGAC (Double Grid Air Counter) for detection of microcracks of metallic materials is put forward.

Key words: electron sensors, metallic microcracks, exoelectron non destructive testing