  The scattering of test fields by sandwich waves has been studied extensively.
It has been found that for a variety of test fields, the energy of the
scattered waves is amplified. In this paper, Scattering of test gravitational
waves by sandwich waves are calculated by solving gravitational perturbations
in the sandwich wave background. Dependence of their energy amplification with
respect to the sandwich wave parameters and the incident wave parameters are
examined. The results show that in some cases, the energy of the outgoing test
gravitational wave is amplified as well.
