Abstract
Utilizing a mathematical algorithm developed for photoacoustic tomography, it is possible to deduce the laser beam spatial profile within pulsed photoacoustic measurements. This method is based on the temporal shape of the photoacoustic signal analysis. The exact solution for the laser beam spatial profile obtained with this method involves summation of a series and may take much time to compute. Sometimes the simplification of this solution can be done if the detection radius is much larger than the photoacoustic signal wavelength. This simplification is the so-called detection radius/signal wavelength approximation. Our numerical results obtained with this approximation are presented here. These results are compared with the one obtained using a different method and an exact solution. Experimental conditions for photoacoustic signal generation used in our numerical analysis correspond to the multiphoton absorption in SF6–Ar mixtures. Together with the laser beam spatial profile, the molecular vibrational to relaxational time of the excited molecules is calculated simultaneously. Application of neural computation and genetic optimization in pulsed photoacoustics is also discussed.
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