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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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Frequency dependence of resonant photoacoustic cells: The extended Helmholtz resonator
O. Nordhaus,J. Pelzl +1 more
TL;DR: In this paper, the amplitude and phase angle of the PA signal were measured as a function of the chopping frequency, tube length and buffer gas, which can be interpreted quantitatively by a modified model of the acoustic Helmholtz resonator.
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On the photodeflection method applied to low thermal diffusivity measurements
TL;DR: In this article, the phase of the photodeflection signal is used to extend the thermal diffusivity range of measurements using the phase phase of photodeglection signal, and a comparison with computer simulations and experimental results shows good agreement.
Journal ArticleDOI
Truncated-correlation photothermal coherence tomography for deep subsurface analysis
TL;DR: In this article, a photothermal imaging scheme analogous to optical coherence tomography was used to construct the three-dimensional structures of bone and burn-affected skin, which can be used for medical applications.
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An in situ FTIR step-scan photoacoustic investigation of kerogen and minerals in oil shale.
TL;DR: Comparisons of spectra from the light and dark colored oil shale core samples suggest that the light colored regions have high kerogen content, with spectra similar to that from isolated kerogen, whereas, the dark colored areas contain more mineral components which include clay minerals, dolomite, calcite, and pyrite.
Journal ArticleDOI
The Photoacoustic Effect in Semiconductors
TL;DR: In this paper, a theory of photoacoustic effect in semiconductors is developed for the region of fundamental absorption, taking into account the generation of free electrons and holes, their diffusion, and recombination.
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.