A Direct Imaging Method for Half-Space Inverse Elastic Scattering Problems
For researchers in inverse scattering and nondestructive testing, this work provides a theoretically grounded direct imaging method for elastic obstacles in half-space, though it is an incremental extension of existing reverse time migration techniques.
This paper proposes a direct imaging method using reverse time migration to reconstruct extended obstacles in a half-space from finite aperture elastic scattering data at a fixed frequency. The method is proven to achieve resolution dependent on aperture and depth, with numerical examples demonstrating its effectiveness.
We propose a direct imaging method based on the reverse time migration to reconstruct extended obstacles in the half space with finite aperture elastic scattering data at a fixed frequency. We prove the resolution of the reconstruction method in terms of the aperture and the depth of the obstacle embedded in the half space. The resolution analysis is studied by virtue of the point spread function and implies that the imaginary part of the cross-correlation imaging function always peaks on the upper boundary of the obstacle. Numerical examples are included to illustrate the effectiveness of the method.