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Waveguide disturbance detection method

United States Patent

6,108,606
August 22, 2000
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
A method for detection of a disturbance in a waveguide comprising transmitting a wavefield having symmetric and antisymmetric components from a horizontally and/or vertically polarized source and/or pressure source disposed symmetrically with respect to the longitudinal central axis of the waveguide at one end of the waveguide, recording the horizontal and/or vertical component or a pressure of the wavefield with a vertical array of receivers disposed at the opposite end of the waveguide, separating the wavenumber transform of the wavefield into the symmetric and antisymmetric components, integrating the symmetric and antisymmetric components over a broad frequency range, and comparing the magnitude of the symmetric components and the antisymmetric components to an expected magnitude for the symmetric components and the antisymmetric components for a waveguide of uniform thickness and properties thereby determining whether or not a disturbance is present inside the waveguide.
Korneev; Valeri A. (Albany, CA), Nihei; Kurt T. (Oakland, CA), Myer; Larry R. (Benicia, CA)
Gas Research Institute (Chicago, IL)
08/ 929,955
September 15, 1997
The present invention was made, in part, under Department of Energy Contract No. DE-AC03-76SF00098. The U.S. Government has certain rights in this invention.