Mathematics – Analysis of PDEs
Scientific paper
2011-07-13
Mathematics
Analysis of PDEs
34 pages, submitted to Inverse Problems on 13 July 2011
Scientific paper
In this paper a wave is generated by an initial data whose support is localized at the outside of unknown obstacles and observed in a limited time on a known closed surface or the same position as the support of the initial data. The observed data in the latter process are nothing but the back-scattering data. Two types of obstacles are considered. One is obstacles with a dissipative boundary condition which is a generalization of the sound-hard obstacles; another is obstacles with a finite refractive index, so-called, transparent obstacles. For each type of obstacles two formulae which yield explicitly the distance from the support of the initial data to unknown obstacles are given.
IKehata Masaru
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