Ultrasonic sensor for fingerprints recognition
Wiesław Bicz, Zbigniew Gumienny, Mieczyslaw Pluta · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1995
The paper presents prototypes of ultrasonic sensors for fingerprint pattern recognition. Their principle of operation is based on the amplitude measurements taken in selected points of acoustic field of ultrasonic wave diffracted from subsurface finger structure. Examples of sensor construction and measured data are presented. Fingerprint structure recognition from pulse echo shows the possible use of the sensor as a synthetic aperture microscope.