NDLI: Thermally Induced Photoacoustic Transients Produced by Laser-Irradiated Fluid Spheres

Content Provider	Springer Nature Link
Author	Frez, Clifford Diebold, Gerald J.
Copyright Year	2014
Abstract	Pulsed laser irradiation of a weakly absorbing fluid sphere in a transparent medium results in the production of a large thermal gradient at the surface of the sphere. The rapid transfer of heat from the sphere to the surrounding fluid as a result of the thermal gradient generates high frequency photoacoustic transients which affect the leading edge of a photoacoustic wave. Here, the character of the photoacoustic wave is determined by solving a modified wave equation for the photoacoustic effect. A solution to the heat diffusion equation is determined, which, together with the heating function for the optical source, provides the source term for the wave equation for pressure. The wave equation is then solved with appropriate boundary conditions using Laplace transform techniques to give the photoacoustic waveform. The relative magnitude of the transient to the N-shaped wave is shown to be determined, in part, by the laser pulse length.
Starting Page	2171
Ending Page	2177
Page Count	7
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	35
Issue Number	12
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2014-01-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optoacoustic Photoacoustic Thermal gradient Condensed Matter Physics Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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