title: Fingerprint imaging of dry finger using photoacoustics.
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.
authors.affiliation: Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Republic of Korea cwy1533@hanyang.ac.kr.
authors.forename: Won Young
authors.initials: WY
authors.lastname: Choi
authors.affiliation: Department of Mechanical Engineering, Hanyang University, Seoul 04763, Republic of Korea kwankyu@hanyang.ac.kr.
authors.forename: Kwan Kyu
authors.initials: KK
authors.lastname: Park