Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1997-08-04
1999-09-21
Pham, Hoa Q.
Optics: measuring and testing
By particle light scattering
With photocell detection
356340, 356343, G01N 2100
Patent
active
059561394
ABSTRACT:
A method and apparatus for analyzing a fluid containing light scattering components. The apparatus includes a laser adapted to direct abeam of light into the fluid such as a liquid containing particles, and at least two detectors to receive light scattered by the fluid, which received light is used to calculate a physical property of the fluid. A focusing lens may be used to focus the light beam to a focal waist in the fluid to enhance the degree of spatial coherence of the scattered light. The two detectors are aligned onto the focal waist and are adapted to send a signal to a data processor which correlates the signal received from said two detectors. The two detectors are spaced a substantially equal distance from the focal waist and are oriented at substantially the same angle with respect to the direction of propagation of the incident beam. The data processor is adapted to cross-correlate the signals received from the two detectors. A polarizer can be positioned between the focal waist and the two detectors to aid in positioning the detectors and to enhance the efficiency and speed of the measurement.
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Suppression of Multiple Scattering Using a Single Beam Cross-Correlation Method, published in Light Scattering and Photon Correlation Spectroscopy by Kluwer (Dordrecht), 1997.
Cannell David S.
Cheung H. Michael
Lock James A.
Mann, Jr. J. Adin
Meyer William V.
Ohio Aerospace Institute
Pham Hoa Q.
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