Test techniques for assessing ultrasonic fingerprint sensors

摘要

Techniques for testing ultrasonic fingerprint sensors include operating a fingerprint impress simulator that may cyclically press a contact pad of the simulator against a platen of an ultrasonic sensor under test. A control electronics arrangement may operate the ultrasonic sensor under test and the fingerprint impress simulator, and may receive ultrasonic image data from the ultrasonic sensor under test. The ultrasonic sensor may include an ultrasonic transmitter and an ultrasonic sensor array disposed between the ultrasonic transmitter and the platen. The control electronics arrangement may cause the ultrasonic transmitter to emit an ultrasonic pulse, and may receive ultrasonic image data from the ultrasonic sensor array, the ultrasonic image data being converted from a detected portion of the ultrasonic pulse.

主权项

1. An apparatus for testing an ultrasonic sensor under test, the apparatus comprising:
a fingerprint impress simulator including a contact pad; and a control electronics arrangement configured to operate the ultrasonic sensor under test and the fingerprint impress simulator, and to receive ultrasonic image data from the ultrasonic sensor under test, wherein the contact pad is fabricated from a material having one or more of a stiffness and an acoustic impedance characteristic that simulate skin of a finger and the fingerprint impress simulator is configured to cyclically press the contact pad against a platen of the ultrasonic sensor under test.