A2.2 - Piezoceramic Ultrasound Transducer Enabling Broadband Transmission for 3D Scene Analysis in Air

Johannes Kellner & Herbert Schweinzer
Frequency-modulated ultrasound signals like chirp-signals show variations in phase at the different transmission angles. Analyzing the phase of ultrasound chirp-echoes enables to accurately determine distance and polar angle to the point of reflection. Though single piezoceramic ultrasound transducers have a small bandwidth, an ultrasound transducer made of a combination of piezoceramic elements with different resonance frequencies as presented in this work enables transmission of broadband chirpsignals and shows the required rotational symmetry.