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By P. N. Pusey, P. N. Segrè, O. P. Behrend, S. P. Meeker, W. C. K. Poon (auth.), E. R. Pike, J. B. Abbiss (eds.)

Since their inception greater than 2.5 years in the past, photon correlation recommendations for the spatial, temporal or spectral research of fluctuating mild fields have discovered an ever-widening diversity of purposes. utilizing detectors which re­ spond to unmarried quanta of the radiation box, those equipment are intrinsically electronic in natnre and in lots of experimental events supply a special measure of accuracy and sensitivity, not just for the examine of basic gentle resources themselves, yet so much rather within the use of a laser-beam probe to check mild scattering from natural fluids, macromolecular suspensions and laminar or turbulent flowing fluids and gases. Following the earliest advancements in laser scattering through dilute macro­ nl01ecular suspensions, in , ... hich particle sizing used to be the most objective, and using photon correlation thoughts for laser-Doppler experiences of circulate and tnrbuence. either one of which parts have been the topic of NATO ASls in Capri, Italy in 19;:3 and 19;6. major advances have be('n made lately in lots of different components. those have been mirrored within the subject matters coated during this NATO complex examine Workshop, which happened from August 2;th to thirtieth, 1!)!}6, on the Jagiellonian college, Krakow, Poland. those in­ cluded ('xperimental options. statist.ics and knowledge relief, colloids and aggregation, polymers, gels, liquid crystals and combos, protein options, serious pllf'nomena and dense media.

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7. Dhont, J. K. G. and de Kruif, C. G. (1983) "Scattered light intensity cross correlation. I. Theory" J. Chern. Phys. 79, 1658-1563. 8. Mos, H. , Dhont, J. K. , and de Kruif, C. G. (1986) "Scattered light intensity cross correlation. II. Experimental' J. Chern. Phys. 84, 45-49. 9. Schlltzel, K. (1991) "Suppression o/multiple scattering by photon crosscorrelation techniques" J. Mod. Opt. 38,1849-1865. 10. See, for example, Born, M. and Wolf, E. (1980) Principles o/Optics 6th ed. pp 508-516 (Pergamon, London) THEORY OF MULTIPLE SCATTERING SUPPRESSION IN CROSS-CORRELATED LIGHT SCATTERING EMPLOYING A SINGLE LASER BEAM James A.

MEYER NASA LeRC / Ohio Aerospace Institute, MS. 105-1 21000 Brookpark Road, Cleveland, Ohio 44135-3191 DAVID S. CANNELL Department ofPhysics, UC Santa Barbara Santa Barbara, California 93106-9530 ANTHONY E. SMART 2857 Europa Drive, Costa Mesa California 92626-3525 THOMAS W. TAYLOR Department ofPhysics, Cleveland State University Cleveland, Ohio 44115-2440 PADETHA TIN NASA LeRC / Ohio Aerospace Institute, MS. 105-1 21000 Brookpark Road, Cleveland, Ohio 44135-3191 Abstract We present a simple, single beam, laser light scattering technique which discriminates against multiple scattering in turbid media using cross-correlation of the scattered intensity at slightly different spatial positions.

For semi-dilute systems where multiple scattering first becomes significant, various investigators have calculated and compensated for the effects of double scattering [2-5]. 7] and radiative transfer [8] models. Still others have iIIumlnated the sample with two laser beams and cross-correlated the scattered light recorded by a pair of detectors [9-15]. L"nder certain circumstances this greatly suppresses the contribution of multiple scattering relative to that of single scattering. A common concern shared by two-beam two-detector cross-correlation systems is that they are difficult to align.

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