Errors in Holographic Imaging of Acoustic Sources Due to Nonlinear Propogation

Understanding the acoustic field radiated by finite-amplitude sources such as rockets and jets can be important for assessing the impact on involved structures and surrounding communities. Near-field acoustical holography (NAH) can be used to image source radiation. However, this technique, based on linear equations, does not account for nonlinear behavior. A propagation algorithm that accounts for nonlinear effects is used to propagate a broadband waveform in one-dimension. The waveform is then reconstructed at various distances using NAH. The errors are presented and discussed for several amplitude cases