Focal length control of complex harmonic and complex pulsed ultrasonic bounded beams

Nico F. Declercq, Joris Degrieck, Oswald Leroy
2005 Journal of Applied Physics  
This article describes a way to change the focal length of a single transducer without phased array technology and without changing the ͑real͒ frequency. The physical effect is induced by changing the signal's amplitude in a precise manner in order to approach the complex harmonic wave regime. In this regime, changing the imaginary frequency results in a change of the focal length. A study is performed for different beam shapes and for complex harmonic signals as well as for complex pulsed signals.
more » ... complex pulsed signals.
doi:10.1063/1.1851015 fatcat:oudzenrmtrdhtfopuwivxeiqeq