Abstract
Capitalizing on the photoacoustic effect, we developed a new fingerprint sensing system that can reveal both fingerprints and underlying vascular structures at a high spatial resolution. Our system is built on a 15 MHz linear transducer array, a research ultrasound system, and a 532-nm pulsed laser. A 3D image was obtained by scanning the linear array over the fingertip. The acquired fingerprint images strongly agreed with the images acquired from ultrasound. Additional experiments were also conducted to investigate the effect of acoustic coupling. We discovered that high-quality fingerprint and vessel images can be acquired from both wet and dry fingers using our photoacoustic system. The reduced subdermal features in dry coupling can be enhanced through post-processing. Compared to existing fingerprint scanners, the photoacoustic approach provides a higher quality 3D image of the fingerprint, as well as unique subdermal vasculature structures, making the system almost impossible to counterfeit.
Highlights
Capitalizing on the photoacoustic effect, we developed a new fingerprint sensing system that can reveal both fingerprints and underlying vascular structures at a high spatial resolution
We developed a high-resolution, depth-resolving fingerprint imaging system based on photoacoustic (PA) tomography (PAT)[8]
We quantified the full width at half maximum (FWHM) along lateral and elevation directions to be 0.12 mm (Fig. 2b) and 0.23 mm (Fig. 2c), respectively
Summary
Capitalizing on the photoacoustic effect, we developed a new fingerprint sensing system that can reveal both fingerprints and underlying vascular structures at a high spatial resolution. While ultrasonic sensor could provide depth information, it has limited sensitivity to subdermal vascular structures These systems are vulnerable to attacks via spoof fingerprints[6]. The fingerprint data from different types of sensors may influence algorithm p erformance[7] To overcome these issues, we developed a high-resolution, depth-resolving fingerprint imaging system based on photoacoustic (PA) tomography (PAT)[8]. We developed a linear-array-based PAT system that is capable of providing high-resolution 3D images of fingerprints and the underlying vascular structures. Since both fingerprints and subdermal vasculature are acquired, PAT can counter-measure both bulk and thin-film fingerprint spoofs. Our system can scan across the finger (FOV: 30 mm × 27.6 mm) within 60 s
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
