The basic concepts behind the researchers' technology are akin to those of medical ultrasound imaging. They created a tiny ultrasound imager, designed to observe only a shallow layer of tissue near the finger's surface. "Ultrasound images are collected in the same way that medical ultrasound is conducted," said Horsley. "Transducers on the chip's surface emit a pulse of ultrasound, and these same transducers receive echoes returning from the ridges and valleys of your fingerprint's surface."
Monday, June 29, 2015
UC Davis develops mobile ultrasound fingerprint reader
Ultrasonic fingerprint sensor may take smartphone security to new level (Science Daily)
