Abstract
A new approach is developed to measure the dynamic characteristics of metal
sheet under laser shock, including deformation velocity, strain, and strain rate.
The detecting laser beam is partially shaded by the target deformation induced by
the laser action. A photodiode transforms the received beam intensity real time into
an electrical signal which could record the process of the target deformation. The
functional relation between the electrical signal and the deformation of the metal
sheet is derived. The deformation curve of a thin aluminum and the velocity curve of
its deformation are also obtained during the experiment. The results indicate that
the average velocity of the elastic deformation of the target can reach 2.999×10<sup>3</sup>
m/s in the central area. This new method provides an approach in the study of the
effect of strain rate on deformation.
© 2012 Chinese Optics Letters
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