Waveguide disturbance detection method

Details Waveguide disturbance detection method Waveguide disturbance detection method

1997-09-15

2000-08-22

Oda, Christine K.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

702 2, G01V 142

Patent

active

061086061

ABSTRACT:
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.

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