An ultrasonic system and method for imaging a surface wherein a C-mode ultrasonic scan is performed over a fixed area of the surface and range gating is applied to that area to a given depth below the surface. For use of the system and method in fingerprint imaging, a live finger is placed upon a sensitive...http://www.google.fr/patents/US5224174?utm_source=gb-gplus-shareBrevet US5224174 - Surface feature mapping using high resolution C-scan ultrasonography
Surface feature mapping using high resolution C-scan ultrasonography
