Abstract
The photoacoustic (PA) effect of condensed matter measured in a gas-microphone cell can be interpreted by the Rosencwaig-Gersho-model. This model developed originally for thermally thick gas columns is extended to arbitrary gas lengths. The periodic variation of temperature varies the internal energy of the total volume of the gas leading to a pressure oscillation by an isochoric process. Further, taking into account a residual volume as introduced by Tam and Wong, the description leads finally to an extended Rosencwaig-Gersho model (ERG). Measurements with argon (γ=1.67) and Freon 13 (CClF3, γ=1.17) for thermally thin and thick gas colomns confirm the isochoric character of the PA effect at frequencies far below the acoustic cell resonance. Experimental results of other groups can be interpreted very well with our model. Furthermore, the extended Rosencwaig-Gershomodel leads just in the low frequency region to the same results as the model of McDonald and Wetsel.
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References
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