박관규
2019-12-10T16:35:23Z
2019-12-10T16:35:23Z
2018-12
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, v. 66, no. 2, page. 402-411
0885-3010
1525-8955
https://orcid.org/0000-0001-5117-5853
https://repository.hanyang.ac.kr/handle/20.500.11754/121038
Fingerprint imaging is a powerful tool in biometric identification systems. This paper proposes a fingerprint imaging method that involves applying an impedance signal to a fingerprint via ultrasonic impediography using a capacitive micromachined ultrasonic transducer (CMUT). We fabricated CMUT sparse array which has a center frequency of 6.25 MHz and collapse voltage of 50 V by local oxidation of silicon process. We develop a prototype by using waveguide and ultrasonic impediography method based on the CMUT. By using a waveguide made from a hard material, the prototype can ensure device protection and image lateral resolution improvement. The proposed technique successfully images the acoustic input impedance differences between the ridges and valleys of a fingerprint. The images created using direct touch and waveguide models are compared and analyzed. In addition, we present a phenomenon in the waveguide system in terms of energy loss by using numerical simulation. Therefore, this study facilitates ultrasonic fingerprint impediography measurement based on the basic direct touch and quartz glass waveguide system.
This work was supported by the Ministry of Science, ICT and Future Planning through the National Research Foundation of Korea within the Basic Science Research Program under Grant 2014R1A1A1006024.
en_US
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Capacitive micromachined ultrasonic transducer (CMUT)
direct touch
fingerprint imaging
impediography
waveguide
Fingerprint Imaging System Based on Capacitive Micromachined Ultrasonic Transducer by Using Impediography Method Including Direct Touch and Waveguide Methods
Article
2
66
10.1109/TUFFC.2018.2885788
402-411
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
Choi, Won Young
Kwak, Yun Sang
Park, Kwan Kyu
2018003298
S
COLLEGE OF ENGINEERING[S]
DIVISION OF MECHANICAL ENGINEERING
kwankyu
L-1074-2016