The 3D Sonic Sensor technology reflects sound waves from human skin and captures the data that it receives back. AT
At the same time, moisture or small dirt on the finger or screen are not an obstacle for reading a print. This means that a protective film can be glued to the display glass.
The developers also gave details about the newTechnology: hardware consists of a transmitter and a receiver. The ultrasonic pulse is transmitted to a finger located above the scanner. Part of the pressure of this pulse is absorbed, and part is reflected back to the sensor, depending on the pores and other details characteristic of each print.
The microphone does not listen for return signals. Instead, a sensor that can detect mechanical stress is used to calculate the intensity of the return of the ultrasonic pulse at various points in the device. Scanning over a longer period provides additional in-depth fingerprint data.
Qualcomm notes that there is an approximately 250-ms delay before unlocking. Sensor error rate is about 1%, which is comparable with the performance of other scanners.