The photoacoustic effect generated by a spherical droplet in a fluid

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Abstract
In general, the absorption of amplitude-modulated radiation by a body results in heating and a subsequent thermal expansion that gives rise to the emission of sound waves. Here, the properties of sound waves emitted by uniformly heated spherical droplets are found as a frequency domain solution to a boundary-value problem for the acoustic pressure. The expression for the pressure is Fourier transformed to give the time domain pressure response to a delta function light pulse. Owing to the different sound speeds and densities in the sphere and its surrounding medium, the effects of reflection, dispersion, and phase cancellation can be seen in the acoustic signal.

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