The Target Probe Testing Model with the Electrical Effect of a Laser Plasma Induced on a Metal Target

摘要

In this paper the electrical effect of laser plasma induced on a metal target is studied. Based on the basic features of the laser plasma of fewer charges and rapid expansion, combining with the mechanism of interaction between the metal target and the plasma, an equivalent current source model of the electrical effect of the laser plasma is established founded on the time characteristics of the laser affect process and the laser plasma expansion process. Finally, a form of mathematical function which can well describe the evolution of target electric potential signal is given. The involved results indicate that the theoretical model matches well with experiment.