Model based development of a commercial, acoustic fingerprint sensor

FEM modeling is used to design and support implementation of an acoustic fingerprint (FP) sensor utilizing 1-3 piezo-composite as a sensor matrix. Providing a selected PZT/Polymer system simulation revealed the geometry for the successful implementation of the sensor with a resolution of 500 DPI and a contrast of >80% differentiation between ridges and valley. Simulation predicted performance within single-digit percentage deviation between measurement and model. Several experiments demonstrate the supporting role of modeling in sensor manufacturing capable of defining tolerances for manufacturing processes.