Thermal piston model for the optoacoustic effect: Sound generation in an optically thick gas

Stewart, R. B.; Diebold, G. J.
January 1987
Applied Physics Letters;1/5/1987, Vol. 50 Issue 1, p13
Academic Journal
At high concentrations of an infrared absorbing gas, the optical absorption length for the incident radiation can become small compared with the thermal diffusion length in the gas. A description of the optoacoustic effect consequently must include thermal conduction of heat to the cell window since sound generation takes place in a thin layer of gas adjacent to the entrance window. A piston model is given here for the optoacoustic effect generated in a highly absorbing gas; in addition, experiments are reported that show new phase and amplitude dependences of the acoustic signal on gas concentrations, and modulation frequency.


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