An ultrasonic sensor includes a transmitting device, receiving devices arranged in an array, and a circuit device. One receiving device is configured as a reference receiving device. The circuit device includes a reference signal generator and first and second synchronous detectors. The reference signal...http://www.google.fr/patents/US8009518?utm_source=gb-gplus-shareBrevet US8009518 - Ultrasonic sensor with piezoelectric elements and vibration isolator
Ultrasonic sensor with piezoelectric elements and vibration isolator
