Journal ArticleDOI
Theory of the photoacoustic effect with solids
Allan Rosencwaig,Allen Gersho +1 more
Reads0
Chats0
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
More filters
Journal ArticleDOI
Biomass monitoring using the photoacoustic effect
Kai Schmidt,Dieter Beckmann +1 more
TL;DR: In this paper, photoacoustic spectroscopy was evaluated as useful for the determination of the number of cells in a fermentation and the influence of scattering particles and gas bubbles on the measurement was investigated.
Photothermal Generation of Thermoelastic Waves in Composite Media
TL;DR: In this paper, the essential physics of photothermal generation of ther- moelastic waves is reviewed, principally with the use of one-dimensional models of composite media, and the emphasis is placed on under standing the effects of material and dynamical parameters on the thermoelastic generation process.
Journal ArticleDOI
Absorption measurements of laser optical materials by interferometric calorimetry
Masahide Itoh,Iwao Ogura +1 more
TL;DR: In this article, the authors proposed a new technique of measuring bulk and surface absorption coefficients using an interferometric calorimetry, which is important to separate surface absorption from bulk absorption, for recent studies have revealed that surface damage occurs earlier than bulk absorption.
Journal ArticleDOI
Practical analysis of polymers with depth varying compositions using Fourier transform infrared photoacoustic spectroscopy (plenary)
TL;DR: Fourier transform infrared photoacoustic spectroscopy can be used as a nondestructive method to probe the molecular composition of materials as a function of depth into the sample as discussed by the authors.
Journal ArticleDOI
Cell effects in optoacoustic spectrometry
TL;DR: In this article, a single-beam optoacoustic spectrometer has been constructed to study the effect of cell material, sample backing and sample thickness on the magnitude of the opto-acoustic signal for a solid sample.
References
More filters
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.