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Ultrasonic fingerprint sensor in underglass prototype using impedance mismatching

Title
Ultrasonic fingerprint sensor in underglass prototype using impedance mismatching
Author
박관규
Keywords
Ultrasound imaging; Fingerprint imaging; Biometric identification; Focused transducer
Issue Date
2020-02
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Citation
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v. 34, no. 2, page. 531-539
Abstract
Fingerprint imaging is a powerful tool in biometric identification systems. There are several methods for measuring fingerprints, such as optics, capacitive, and ultrasonic methods. The previous ultrasonic imaging techniques have been available in immersion systems which require the hands to be put into water. Also, pulse-echo system in dry condition has coupling layer which is similar acoustic impedance to human tissue or high impedance materials based on waveguide. For fingerprint imaging in the dry state, we propose an ultrasonic imaging technique in underglass by using the impedance mismatch between the fingertip and the solid plate. We present the image results according to the plate material such as acrylic, glass and PDMS. In addition, simulation results based on small 2-D array transducers in a near field suggest the feasibility of compact and fast fingerprint scanning system. Therefore, this work presents feasibility of ultrasonic pulse-echo fingerprint sensing method for dry hand.
URI
https://link.springer.com/article/10.1007/s12206-019-1122-3https://repository.hanyang.ac.kr/handle/20.500.11754/161492
ISSN
1738-494X; 1976-3824
DOI
10.1007/s12206-019-1122-3
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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