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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
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Applications of Fourier transform infrared photoacoustic spectroscopy (FT-IR / PAS) to surface and corrosion phenomena
TL;DR: In this article, the development of FT-IR / PAS as a surface analytical technique is described by analytical studies presented in this paper, where the authors focus on the use of FTIR/PAS alone, both qualitatively and quantitatively, and in comparison with X-Ray Photoelectron Spectroscopy (XPS or ESCA) and have yielded a variety of information, especially in the realm of polymer, catalyst and corrosion applications.
Journal ArticleDOI
Photo-formation of gold nanoparticles: photoacoustic studies on solid monoliths of Au(III)-chitosan-silica aerogels.
TL;DR: Photo-formation of gold nanoparticles in the solid monoliths of Au(III)-chitosan-silica aerogels with different Au/NH(2) molar ratios has been investigated using photoacoustic spectroscopy, implying the thermally thin character of Au
Journal ArticleDOI
Photoacoustic, photoelectrochemical current, and photoluminescence spectra of highly porous, polycrystalline TiO2 electrodes fabricated by chemical synthesis
TL;DR: In this article, the effect of a voltage in a concentrated KCl electrolyte on photoacoustic (PA), photoelectrochemical current (PEC), and photoluminescence (PL) spectra for the preparation of highly porous, polycrystalline TiO2 electrodes was investigated.
Journal ArticleDOI
Characterizations of undoped and Cu doped CdS thin films using photothermal and other techniques
TL;DR: In this paper, a photothermal deflection spectroscopy (PDS) technique was used to study undoped and copper (Cu) doped cadmium sulphide (CdS) thin films.
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Laser photothermal radiometric instrumentation for fast in-line industrial steel hardness inspection and case depth measurements
Xinxin Guo,Konesh Sivagurunathan,Jose A. Garcia,Andreas Mandelis,Salvatore Giunta,Salvatore Milletari +5 more
TL;DR: The results demonstrated that three measurement parameters extracted from fast swept-sine photothermal excitation and measurements, namely, the phase minimum frequency f(min), the peak or trough frequency width W, and the area S, are complementary for evaluating widely different ranges of hardness case depth.
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.
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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.