G - Physics – 01 – J
Patent
G - Physics
01
J
354/29, 73/59
G01J 3/44 (2006.01) G01N 15/02 (2006.01) G01P 5/00 (2006.01) G01P 5/26 (2006.01) G01J 3/02 (2006.01) G01N 15/14 (2006.01) G01N 21/49 (2006.01) G01N 21/53 (2006.01)
Patent
CA 1316706
ABSTRACT A dynamic light scattering apparatus comprises a laser optically coupled to a light scattering sample via a first monomode optical fibre and a first lens. The lens produces a beam waist in the sample, and scattered light is collected by a receive lens and a second monomode optical fibre. The second fibre has an end face in the Fourier plane of the receive lens, and defines an aperture matched to a single Airy disc of the lens. The receive fibre accordingly receives a single spatial mode of light scattered from the sample, this mode corresponding to a single plane wave to which many scatterers contribute. The receive fibre also attenuates unwanted spatial modes because of its monomode character. A photodetector detects light transmitted by the receive fibre. The invention produces statistically superior results compared to the prior art, this being manifest in an improvement of between 40% and 170% in the parameter [g(2)(?) - 1] at ? = 0.
560540
Fetherstonhaugh & Co.
Qinetiq Limited
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