Multiple-scattering suppression in dynamic light scattering based on a digital camera detection scheme
- Zakharov, Pavel Physics Department, University of Fribourg,Switzerland
- Bhat, Suresh Kumar Physics Department, University of Fribourg,Switzerland
- Schurtenberger, Peter Physics Department, University of Fribourg,Switzerland
- Scheffold, Frank Physics Department, University of Fribourg,Switzerland
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2006
Published in:
- Applied Optics. - 2006, vol. 45, no. 8, p. 1756-1764
English
We introduce a charge-coupled device (CCD) camera-based detection scheme in dynamic light scattering that provides information on the single-scattered autocorrelation function even for fairly turbid samples. It is based on the single focused laser beam geometry combined with the selective cross-correlation analysis of the scattered light intensity. Using a CCD camera as a multispeckle detector, we show how spatial correlations in the intensity pattern can be linked to single- and multiple-scattering processes. Multiple-scattering suppression is then achieved by an efficient cross-correlation algorithm working in real time with a temporal resolution down to 0.02 s. Our approach allows access to the extensive range of systems that show low-order scattering by selective detection of the singly scattered light. Model experiments on slowly relaxing suspensions of titanium dioxide in glycerol were carried out to establish the validity range of our approach. Successful application of the method is demonstrated up to a scattering coefficient of more than µs=5 cm⁻¹ for the sample size of L=1 cm.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 5784
- DOI 10.1364/AO.45.001756
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300026
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