Method and apparatus for measuring density gradient

Details Method and apparatus for measuring density gradient Method and apparatus for measuring density gradient

1982-06-30

1985-10-15

Willis, Davis L.

Optics: measuring and testing

By electrophoresis

356129, G01N 2122

Patent

active

045470715

ABSTRACT:
The present invention related to a method and a device for use in measuring the gradient of density in a fluid. The device is comprised of a laser for providing a columnar light beam and a photodetector axially aligned with the laser. The photodetector detects the displacement of the light beam caused by the gradient of refraction of the fluid. A unit is provided for converting the displacement into an indication of the gradient of refraction and thereby the gradient of the density of the fluid. For density gradients caused by concentration gradients, an additional unit is provided for converting the displacement into a measure of the quantity of substances in the fluid.

REFERENCES:
patent: 3623361 (1971-11-01), Funk, Jr.
patent: 4131427 (1978-12-01), Karp
Corno et al., "Differential Refractometry With Numerical Reading", Nouv. Rev. Optique Appliquee, t. 3, No. 2, pp. 81-84, 1972.
Ahlborn et al., "Quantitative Schlieren Densitometer Employing a Neutral Density Wedge", Rev. Sci. Instrum., vol. 47, No. 5, pp. 570-573, May 1976.

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