【摘 要】
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Background, Motivation and Objective Ultrasonic imaging for fingerprint applications is on the rise due to better tolerance of external conditions and high spatial resolution compared to typical optic
【机 构】
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Department of Mechanical and Aerospace Engineering, University of California, Davis, CA, USA
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Background, Motivation and Objective Ultrasonic imaging for fingerprint applications is on the rise due to better tolerance of external conditions and high spatial resolution compared to typical optical and solid state sensors respectively. Similar to current fingerprint sensors, the performance of such ultrasonic imagers is sensitive to physical damage. Typical single-chip fingerprint sensors use a soft thin-film protective layer which is susceptible to scratches and deformation under normal use. Harder and thicker materials may also be used to protect the sensor, but many of these hard coatings would reflect most if not all of the ultrasound signal due to the difference in acoustic impedance of the material. However, with a sufficiently thin layer of the protective material coated on coupling material, it is possible to transmit and receive ultrasound while protecting the fingerprint sensor from performance degrading physical damage. Therefore it is important to understand the theory behind transmission effects of protective coating for ultrasonic fingerprint sensors.
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