Vol. 23, issue 11, article # 11

Protasevich A. E. Refinement of some analytical solutions for optical-acoustic signal in liquids and gases. // Optika Atmosfery i Okeana. 2010. V. 23. No. 11. P. 1021-1026 [in Russian].
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Abstract:

Ignoring the acoustic wave influence on the absorbing liquid temperature, an accurate solution of equations is derived, which describe the formation of the cylindrically symmetrical optical-acoustic signal from the laser pulse of Gaussian shape for the case of instant transition of the absorbed light energy into the heat. The solution takes into account the variation of the excited liquid at the cost of the medium heat-conductivity. As well, an accurate solution of equations is derived, describing the formation of the cylindrically symmetrical optical-acoustic signal in gas media with not-instant relaxation of the excited molecules after the pass of the laser pulse with a spatial distribution of the intensity, having the Gaussian shape. The variation of sizes of the optical-acoustic signal generation region due to the diffusion of the excited molecules is taken into account.

Keywords:

optoacoustic, liquid, gas, thermal conductivity, relaxation, diffusion