Correction of diffraction effects in an ultrasonic sensor

摘要

It is how to correct the effects of diffraction in an ultrasonic sensor.In one method, a ultrasonic sensor may include a transmitter configured to transmit an ultrasonic wave in soils.A layer of piezoelectric receiver configured to receive a reflected wave of the wave soils.In the reflected wave comprises a plurality of images of a fingerprint that has a plurality of phases in a sequence of time and a platinum layer configured to protect the t.Ransmissor ultrasonic and piezoelectric layer of the receiver.The ultrasonic sensor may include additionally a arrangement of ultrasonic sensor and a processor configured to add the plurality of images multiplied by an exponential phase complex pTo form a complex picture integrated, align the image complex integrated with a pre selected to form a complex picture aligned.To determine a phase of maximum energy with the use of the complex picture aligned, and compute an image of maximum energy to represent the fingerprint based, at least in part,In the complex picture aligned in phase of maximum energy.