CORRECTION OF DIFFRACTION EFFECTS IN AN ULTRASONIC SENSOR

摘要

Embodiments for correcting diffraction effects in an ultrasonic sensor are disclosed. In one embodiment, the ultrasonic sensor is an ultrasonic transmitter configured to transmit ultrasonic waves, a piezoelectric receiver layer configured to receive reflected waves of ultrasonic waves, the reflected waves comprising a plurality of images of a fingerprint having a plurality of phases in a time sequence, A receiver layer, and a platen layer configured to protect the ultrasonic transmitter and the piezoelectric receiver layer. The ultrasonic sensor may further comprise an ultrasonic sensor array and a processor for summing the plurality of images multiplied by the complex phase exponent to form an integrated complex image and for integrating the complex image RTI ID = 0.0 To determine a maximum energy phase using the aligned complex image and to compute a maximum energy image for representing the fingerprint based at least in part on the aligned complex image at the maximum energy phase .