Laser photoacoustic probe of absorber spatial organization

It was experimentally found that the Fourier spectra of acoustic responses (in pulsed laser photoacoustics) are different for emulsified and dissolved absorbers. The role of surface sound waves, acoustic dispersion, experimen tal geometry and macroscopic parameters (e.g., sound velocity, attenuation, thermal expansion etc.) has been cleared up in control experiment. It has been shown that all these parameters cannot explain the difference in Fouri er spectra. Simple model of this phenomenon has been proposed and tested in experiment.