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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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Windowless ultrasound photoacoustic cell for in vivo mid-IR spectroscopy of human epidermis: low interference by changes of air pressure, temperature, and humidity caused by skin contact opens the possibility for a non-invasive monitoring of glucose in the interstitial fluid.
Miguel A. Pleitez,Tobias Lieblein,Alexander Bauer,Otto Hertzberg,Hermann von Lilienfeld-Toal,Werner Mäntele +5 more
TL;DR: It is demonstrated here that this approach can be used for continuous and non- invasive monitoring of the glucose level in human epidermis, and thus may form the basis for a non-invasive monitoring for diabetes patients.
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Determination of the absolute quantum efficiency of luminescence of solid materials employing photoacoustic spectroscopy
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Ultra-rapid-scanning Fourier transform infrared spectrometry
TL;DR: In this article, a new Fourier transform infrared (FT-IR) spectrometer is described by which it is possible to acquire interferograms with 0.25 cm optical path difference (4 cm−1 spectral resolution) in less than 1 ms.
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Internal field resonance structure: Implications for optical absorption and scattering by microscopic particles
TL;DR: In this article, a formal solution for elastic (Mie) and inelastic (Raman) scattering by microscopic particles is derived from the extinction theorem, and some implications of the resonances in the interpretation of absorption, fluorescence, and Raman scattering in microscopic dielectric spheres are discussed.
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.