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Fingerprint imaging of dry finger using photoacoustics

J Acoust Soc Am. 2017 Mar;141(3):EL205. doi: 10.1121/1.4976193.

Abstract

Fingerprint imaging has been widely used in biometric identification systems. This work presents a photoacoustic (PA) fingerprint imaging system that provides acoustic resolution using a pulsed laser and focused ultrasound transducer operating as a receiver. This PA system can measure dry fingers with a wide-range laser field based on the differences in the ultrasound coupling between the fingertip areas contacting and not contacting a solid plate. To demonstrate and validate the image accuracy of the PA system, PA fingerprint images were compared to images captured using a pulse-echo ultrasound system and an ink-pressed fingerprint scan.

Publication types

  • Research Support, Non-U.S. Gov't