Phase error estimation and correction in acoustic microscopy

Consideration is given to the phase error estimation and correction problem in tomographic acoustic microscopy. In a recent paper, Z.C. Lin and G. Wade (ibid., vol.ASSP-35, p.1037-45, July 1987) modeled the phase error as a constant and proposed a single-sideband technique for its correction. The present authors point out that the phase error is not a constant, and that the single-sideband technique removes only the effect of the error in the displayed image. They propose a new method for estimating and correcting the spatially varying phase error. The method is demonstrated for experimental data from the scanning laser and acoustic microscope