(The Gist of Science Reporter) Fingerprint Scanners [MARCH-2018]
(The Gist of Science Reporter) Fingerprint Scanners
There are few different types of scanners used in this category all of which try to find ridges and valleys on fingers by different mechanisms. Optical scanners are the oldest method of capturing fingerprints. The technique involves capturing an optical image to detect unique patterns on the surface by analyzing the lightest and darkest areas of the image. Capacitive scanners, on the other hand, use arrays of tiny capacitor circuits to collect data about the fingerprints. Ultrasonic scanners capture the 3-D scanned fingerprints. The technology uses ultrasonic transmitter and a receiver. An ultrasonic pulse is transmitted against the finger. Some of this pulse is absorbed and some of it is bounced back to the sensor, depending upon the ridges, pores and other details that are unique to each fingerprint.
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Courtesy: Science Reporter