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Theory of the photoacoustic effect with solids
Allan Rosencwaig,Allen Gersho +1 more
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TLDR
In this article, a quantitative derivation for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system is presented. And the theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustical spectroscopy.Abstract:
When chopped light impinges on a solid in an enclosed cell, an acoustic signal is produced within the cell. This effect is the basis of a new spectroscopic technique for the study of solid and semisolid matter. A quantitative derivation is presented for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system. The theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustic spectroscopy. In particular, the theory accounts for the experimental observation that with this technique optical absorption spectra can be obtained for materials that are optically opaque.read more
Citations
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Induction kinetics of heat emission before and after photoinhibition in cotyledons of Raphanus sativus
TL;DR: It was demonstrated that after photoinhibition the decrease in fluorescence yield and in photosynthetic activity are paralleled by an increase in the yield of non-radiative deexcitation, which was proved by measuring the induction kinetics of the photoacoustic signal.
Journal ArticleDOI
Soil characterisation using X-ray diffraction, photoacoustic spectroscopy and electron paramagnetic resonance
R.S.T Manhães,L. T. Auler,Marcelo Silva Sthel,J. Alexandre,M. S. O. Massunaga,Juan Alfredo Guevara Carrió,D.R. dos Santos,E. C. da Silva,A Garcia-Quiroz,Helion Vargas +9 more
TL;DR: In this paper, the optical absorption spectra and chemical composition of soil samples were characterised using photoacoustic spectroscopy (PAS), electron paramagnetic resonance (EPR), X-ray diffraction and Xray fluorescence.
Journal ArticleDOI
The Role of Thermal Properties in Periodic Time-Varying Phenomena.
TL;DR: In this paper, the role played by physical parameters governing the transport of heat in periodical time-varying phenomena within solids is discussed, and a brief look at the conduction heat transport mechanism, the equations governing heat conduction under static, stationary and non-stationary conditions, and physical parameters involved, are described.
Journal ArticleDOI
Study of ultrafast carrier dynamics of nanostructured TiO2 films with and without CdSe quantum dot deposition using lens-free heterodyne detection transient grating technique
TL;DR: In this article, the ultrafast carrier dynamics of nanostructured TiO 2 films with and without CdSe quantum dot (QD) deposition were studied using a lens-free heterodyne detection transient grating (LF-HD-TG) technique.
Journal ArticleDOI
Determining photothermally the thickness of a buried layer
J. Baumann,R. Tilgner +1 more
TL;DR: In this article, the conventional thermal wave treatment following the Rosencwaig-Gersho theory is used to analyze the manner in which the properties of a layer buried within a sample influence the amplitude and the phase of surface temperature oscillation during periodic heating by chopped light.
References
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Journal ArticleDOI
LXVIII. Upon the production of sound by radiant energy
TL;DR: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 11, No. 71, pp. 510-528 as mentioned in this paper discusses the production of sound by radiant energy.
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Photoacoustic spectroscopy of solids
TL;DR: In this article, the opto- or photo-acoustic effect used in gas analysis has been extended to the study of solids, providing a simple method for obtaining information about optical absorptions and subsequent de-excitations in solids.
Journal ArticleDOI
Photoacoustic spectroscopy of biological materials.
TL;DR: In this paper, a new technique for performing optical spectroscopy on solids has been developed Photoacoustic spectra of cytochrome c and hemoglobin show how this technique can be used to obtain information about optical absorptions and subsequent deexcitations in solid biological materials, particularly those which cannot readily be studied by conventional means.