Analysis of Influencing Factors about The Pulse Width of Coin-tap Response Based on Degree of Grey Relation

Coin-tap detection technology is widely used in the field of composite material detection. It measures the health of the material by the pulse width of the coin-tap response signal. During the process of coin-tap detection, various parameters of the internal defects of the material will affect the pulse width of the coin-tap response signal, but the specific relationship between the defect parameters and the pulse width is not yet clear. In this paper, the gray correlation analysis method is used to comprehensively consider the influence of factors such as the size of the defect, the depth of the defect location, and the thickness of the material. The degree of grey relation between each defect parameter and the pulse width of the coin-tap response signal is obtained. The analysis results show that the material thickness has the most obvious influence on the pulse width. In practical applications, the judging criteria should be distinguished according to the thickness of the material, which provides a new direction for the standardized development of tapping detection technology.