método e aparelho para detecção de pico de eco para perfilagem de imagem de furo de poço circuferencial

摘要

Signals from an acoustic transducer used in a borehole include overlapping, ringing reflections from the casing walls, voids in the cement and the formation. By using the Hilbert transform, an envelope of the signals is determined and individual echoes are detected by using a Gauss-Laplace operator.