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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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Transmission and absorption based photoacoustic methods of determination of the optical absorption spectra of Si samples — Comparison
Ł. Chrobak,Mirosław Maliński +1 more
TL;DR: In this paper, a comparison of two photoacoustic methods of determination of the optical absorption coefficient spectra of semiconductors illustrated with results obtained from Si samples is presented, and the advantages and disadvantages of both methods are discussed.
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The benefits of photoacoustics for the monitoring of drug stability and penetration through tissue-mimicking membranes
TL;DR: The paper demonstrates the potential of photoacoustics for the identification of the mechanisms underlying drug transport through tissue-mimicking systems and finds that the dithranol photodegradation rate in the non-steady state system is slower compared to the steady-state case.
Journal ArticleDOI
Depth-resolved chromophore analysis of bovine retina and pigment epithelium by photoacoustic spectroscopy
TL;DR: The cattle retina and retinal pigment epithelium are examined by means of photoacoustic spectroscopy under conditions where structural integrity is maintained, giving a 3-D image of the posterior ocular tissues.
Journal ArticleDOI
Effects of sintering process on the structural, magnetic and thermal properties of Ni0.92Ca0.08Fe2O4 nanoferrite
H.F. Abosheiasha,S.T. Assar +1 more
TL;DR: In this article, the effect of sintering temperature and time on the structural, magnetic, and thermal properties of the prepared samples were investigated by using x-ray diffraction (XRD) and transmission electron microscope (TEM), vibrating sample magnetometer (VSM), and photoacoustic (PA) technique, respectively.
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Thermal parameters of dental materials determined by photoacoustic phase lag measurements
TL;DR: In this paper, the phase lag of the photoacoustic signal obtained by rear surface excitation is employed for the determination of the thermal properties of insulating dental materials such as calcium hydroxide cement, a cavitary varnish and photopolymerized restoration resins.
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.