Dynamic light scattering apparatus

Details Dynamic light scattering apparatus Dynamic light scattering apparatus

1989-07-17

1990-12-04

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356339, G01N 2151

Patent

active

049752375

ABSTRACT:
A dynamic light scattering apparatus (10) comprises a laser (12) optically coupled to a light scattering sample (26) via a first monomode optical fibre (18) and a first lens (22). The lens (22) produces a beam waist (24) in the sample (26), and scattered light is collected by a receive lens (30) and a second monomode optical fibre (34). The second fibre (34) has an end face in the Fourier plane (84) of the receive lens (30, 70), and defines an aperture matched to a single Airy disc (82) of the lens (30, 70). The receive fibre (34) accordingly receives a single spatial mode of light scattered from the sample (26), this mode corresponding to a single plane wave to which many scatterers contribute. The receive fibre (34) also attenuates unwanted spatial modes because of its monomode character. A photodetector (36) detects light transmitted by the receive fibre (34).

REFERENCES:
patent: 4150360 (1979-04-01), Koop et al.
patent: 4762413 (1988-08-01), Namba et al.
Davi, "Application of a Laser Self-Beat Spectroscopic Techniques to the Study of Solutions of Human Plasma Liporoteins", J. Chem. Soc. Faraday Trans II, vol. 20, pp. 200-208, 1974.
Alou et al., "Improving Light Beating Experiments by Dust Discrimination", Rev. Sci. Instrum ., vol. 46, No. 4, pp. 388-390, 4/75.
"Fiber-Optical Quasi-Elastic Light Scattering of Concentrated Dispersions" by H. Auweter and D. Horn, Journal of Colloid and Interface Science, vol. 105, No. 2, Jun. 1985, pp. 399-409.
"Abrasion Tester of Test-Piece" Patent Abstracts of Japan, vol. 10, No. 358 (P-522) (2415) Dec. 2, 1986, and JP, A, 61-155837 (Toshiba Corp.), 15-07-1966, See Abstract.

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