On the relationship between sound intensity and wave impedance

Following a recent paper by one of the author ["On the physical meaning of the power factor in acoustics", J. Acoust. Soc. Am. 131(1), 269-280 (2012)] where the concept of complex intensity has been fully developed from the physical point of view and its spectral properties have been highlighted, the present communication focuses on the relationship between sound intensity and wave impedance. It will be shown how the spectrum of the complex sound intensity magnitude is directly connected with the spectrum of the wave impedance in some model fields (plane quasi-stationary waves and spherical waves) so prefiguring a new methodology for measuring the sound intensity.