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Optical fingerprint scanners suffer from limited depth of penetration and are particularly sensitive to the surface conditions of the skin. Fingerprint scanners based on ultrasounds offer the possibility to explore the surface and the underlying tissues of the finger and to detect blood flow, leading to enhanced robustness and reliability in biometric applications. Capacitive Micromachined Ultrasonic...
In this work the moving linear array technique has been used to perform 3D ecographic images of different human hands, in order to evaluate this technique to biometric recognition purposes. This technique could be considered as a possible evolution and complement of the classical optical hand geometry technique, as it allows the measurements and analysis of the internal hand region. A commercial echografic...
This paper presents the manufacturing of a flexible 192-elements curvilinear CMUT array developed using our patented reverse fabrication process. In this process the silicon nitride CMUT membranes are surface micromachined over a silicon substrate such that the non-radiating surface of the transducer corresponds to the last layer deposited, while the radiating membranes are uncovered by completely...
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