The momentum loss process of collision between superfluous objects in particle impact noise detection (PIND) was analyzed. It is conjectured that the distribution of remainder collision times or peak number in waveform is positively correlated with the elasticity of collision. Samples were fabricated and PIND tests were carried out. After classifying the collected waveforms according to peak number, it is shown that the conjecture is true under certain samples after random factors such as motion direction and collision angle are cancelled, and the conclusion is not affected by such factors as remainder mass and thin-walled structure in the shell. The rule is obtained that τ of remainder with high hardness and not easy to deform is higher than that of the remainder with low hardness or easy to deform, which can be used to get characteristics of remainder through waveform analysis.
