Thermoelastic wave model of the photothermal and photoacoustic signal

Peter Meja; Bernhard Steiger; Pier Paolo Delsanto

doi:10.1117/12.240374

27 May 1996 Thermoelastic wave model of the photothermal and photoacoustic signal

Peter Meja, Bernhard Steiger, Pier Paolo Delsanto

Proceedings Volume 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995; (1996) https://doi.org/10.1117/12.240374
Event: Laser-Induced Damage in Optical Materials: 1995, 1995, Boulder, CO, United States

Abstract

By means of the thermo-elastic wave equation the dynamical propagation of mechanical stress and temperature can be described and applied to model the photothermal and photoacoustic signal. Analytical solutions exist only in particular cases. Using massively parallel computers it is possible to simulate the photothermal and photoacoustic signal in a most sufficient way. In this paper the method of local interaction simulation approach is presented and selected examples of its application are given. The advantages of this method, which is particularly suitable for parallel processing, consist in reduced computation time and simple description of the photoacoustic signal in optical materials. The present contribution introduces our model, the formalism and some results in the 1D case for homogeneous nonattenuative materials. The photoacoustic wave can be understood as a wave with locally limited displacement. This displacement corresponds to a temperature variation. Both variables are usually measured in photoacoustics and photothermal measurements. Therefore the temperature and displacement dependence on optical, elastic and thermal constants is analyzed.

Citation Download Citation

Peter Meja, Bernhard Steiger, and Pier Paolo Delsanto "Thermoelastic wave model of the photothermal and photoacoustic signal", Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); https://doi.org/10.1117/12.240374

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KEYWORDS

Photoacoustic spectroscopy

Wave propagation

Silicon

Acoustics

Temperature metrology

Computing systems

Mass attenuation coefficient

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