抄録
In this study, the imaging of simulated surface-subsurface combined defects using a photoacoustic microscope has been demonstrated. A surface vertical defect is fabricated on a metal specimen surface by mechanical processing. The subsurface defect was made perpendicular to the surface defect by drilling. The surface defect and the subsurface defect were relevantly distinguishable in the photoacoustic amplitude image obtained using the photoacoustic microscope. The size of the subsurface defect and information on the undersurface structure were obtained.
