Patents (University of Northern Iowa)

Document Type

Patent

Publication Date

5-13-2003

Patent Number

6563588 B2

Abstract

A non-contact apparatus and method for mapping the wave profile of capillary waves on a fluid surface to determine viscosity of the fluid. Two conducting blades coupled to a sine wave generator are positioned spaced laterally above and near the surface of the fluid to generate a standing capillary wave on the fluid surface between the blades. A laterally moveable fiber optic probe is coupled to a laser to transmit laser light toward the fluid surface and to receive reflected light from the fluid surface. Part of the laser light reflects from the end of the probe and creates an interference pattern with the light reflected from the fluid surface. The light reflected from the end of the probe and from the fluid surface are combined to form an interference signal which is analyzed to obtain the amplitude of the wave directly under the probe. By moving the probe laterally, nodes on the standing wave may be detected to find the wavelength of the capillary wave. One blade may be decoupled from the sine wave generator and the fiber optic probe moved laterally to determine the wave amplitude of a traveling wave as a function of distance which is then used to determine viscosity.

Application Number

09/747528

Assignee

University of Northern Iowa Research Foundation

Assignee City

Cedar Falls

Assignee State

Iowa

Assignee Country

United States

Filing Date

12-22-2000

Language

en

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