Field Analysis with a New Field Simulation and Propagation Technique

Conclusions

A new field simulation technique has been proposed, and has been found to be computationally efficient, and capable of displaying the full complexity of diffraction effects. Idealised transducer behaviour, as well as field symmetries (circularly symmetric or square transducers) have been assumed. Non-ideal transducer behaviour, such as lateral modes giving rise to head waves, may be incorporated. The assumption of field symmetries may be dropped, but would lead to an increase in computation time. A significant feature of the technique is that pulsed fields from focused bowl transducers may be modelled, without approximation, even for strong curvatures. The extension to lossy, dispersive, and even solid, media may be made relatively straightforwardly. Propagation in nonlinear media offers more of a challenge, and the method is being extended to deal with that case.