Reference-less acoustic holography techniques based on sound intensity.

This paper describes a detailed implementation and application of an intensity based holography method called BAHIM, and investigates its possibilities and its limitations. Although this method is attractive in the sense that it bypasses the reference signal requirement i.e. one of the main difficulties of the classical near-field acoustic holography, its degree of accuracy does not appear to be adequate. This constraint has consequently led to the development of another method called CIBNAH, based on complex intensity, as an alternative. This novel approach has provided so far, high accuracy and the results in some cases seem to surpass those of the classical NAH.