Speckle diagnostics of multiple scattering media with the use of frequency-modulated laser radiation
| Autor: | Dmitry A. Zimnyakov, M. A. Vilensky |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Optics and Spectroscopy. 104:597-603 |
| ISSN: | 1562-6911 0030-400X |
| DOI: | 10.1134/s0030400x08040188 |
| Popis: | A method for probing randomly inhomogeneous multiple scattering media with the use of frequency-modulated laser radiation is considered. The method is based on analysis of the dependence of the blinking index of time-averaged speckles formed upon scattering of the probing radiation in a medium on the frequency modulation depth of the probing radiation. In the case of a binary frequency modulation, the blinking index of the detected speckle-modulated radiation is determined by the cosine Fourier transform of the probability density of the optical path-length difference of partial components of the scattered field in the probed medium. The values of the probability density of the optical path-length difference reconstructed with the use of the proposed method from the measured blinking index of speckles for model scattering media (fluoroplastic layer and layer of TiO2 particles on a glass substrate) are in a good agreement with the results of statistical simulation of the probing radiation transfer in multiple scattering media. |
| Databáze: | OpenAIRE |
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