Update March 4: The first phones with ultrasonic in-display fingerprint sensors, the Samsung Galaxy S10 and S10 Plus, are now on sale. Original story: It’s day one of Qualcomm’s annual ...

Qualcomm’s second-generation ultrasonic fingerprint reader — the 3D Sonic Max —is 17 times larger than the original, in an attempt to solve the first-gen model’s issues.

The sensor’s on-board microprocessor enables always-on operation for wake-up sensing applications. Figure 3 A block diagram of the CH-101 and CH-201 ultrasonic sensors (Image courtesy Reference 1) ...

It has become a common sight, a must-have feature on modern cars, a row of ultrasonic sensors embedded in the rear bumper. They are part of a parking sensor, an aid to drivers for whom depth percep… ...

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[Emil] got his hands on a dozen HC-SR04 ultrasonic sensors, but wasn’t too happy with their performance. Rather than give up, he reverse engineered the sensor and built an improved version. H… ...