Strong interest has been shown on the propagation of transient ultrasonic waves inside a high reverberating cavity filled with moving scatterers. A diffuse model theoretically justifies that the elastic cross section and the dynamic of the scatterers can be deduced from field correlations. Recently, experiments have been performed to also obtain the inelastic cross section of the scatterers. In this letter, we propose justifying this extension within the diffuse model. Experimental results obtained inside a 1.5 liter reverberant water tank at 900 kHz central working frequency with spheres made of materials of different absorption are presented.

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