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Theory of the photoacoustic effect with solids
Allan Rosencwaig,Allen Gersho +1 more
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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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Absolute optical absorption coefficient measurements using photoacoustic spectroscopy amplitude and phase information
Y. C. Teng,Barrie S. H. Royce +1 more
TL;DR: In this paper, a method for determining the absolute absorption coefficient of condensed samples is presented. But this method is not applicable to the case of ion electrophoresis in aqueous solutions.
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Optical Effects Associated with Aggregates of Clusters
TL;DR: In this paper, the effect of aggregation on the optical properties of nanometer-sized particles is studied, and it is shown that for small noble metal clusters as well as for pigments of Fe2O3, TiN, or ZrN, the aggregation leads to changes in the color of colloidal systems which are caused by electromagnetic coupling among the clusters in the aggregates.
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Open-cell photoacoustic radiation detector
TL;DR: In this article, a simple and inexpensive photoacoustic radiation detector was proposed, which consists of the front air chamber of a commercial electret microphone used as the transducer medium itself.
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Digital Signal Processing for Step-Scan Fourier Transform Infrared Photoacoustic Spectroscopy
TL;DR: The DSP algorithm and its sampling depth multiplexing advantages are compared to conventional hardware demodulation and application of the DSP method to step-scan photoacoustic measurements with phase modulation is discussed as it applies to obtaining depth profile information in heterogeneous materials.
Journal ArticleDOI
Three‐dimensional heat‐flow effects in photoacoustic spectroscopy of solids
R. S. Quimby,W. M. Yen +1 more
TL;DR: In this paper, the authors studied the dependence of the photoacoustic signal on the position of focused light on the sample's surface and demonstrated experimentally that a three-dimensional heat flow analysis is required in some cases, especially at low chopping frequencies.
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.