Method and apparatus for determining source location of energy carried in the form of propagating waves through a conducting medium
First Claim
1. A method of determining source location of energy carried in the form of propagating waves through a conducting medium comprising:
- a) detecting the waveform energy simultaneously at a plurality of points on, near, or in the conducting medium;
b) recording the detected energy;
c) isolating one or more modes of propagation of the energy through the medium;
d) deriving source location by using generalized cross correlation of selected isolated modes of propagation.
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Abstract
A method and apparatus for determining source location for acoustic or other waveform energy in a conducting medium. The method includes simultaneously detecting and transducing the source energy at a plurality of points in the medium into a composite signal representative of the source energy, as sensed at each point. Dispersional modes of propagation of the energy, if more than one, are isolated from each other, preferably by Fourier transform spatially and temporally. Generalized cross correlation is performed on selected isolated modes, resulting in identification of a value from which source location can be located. The apparatus can include an array of spaced apart transducers which are configured to be minimally interfering with source energy propagation through the medium. An multi-channel data acquisition device, including A/D converters for each transducer, captures and digitizes the output of each transducer simultaneously. A digital signal processor operatively associated with the data acquisition device is used to isolate the dispersional modes of the transduced energy and to derive source location with generalized cross correlation techniques.
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Citations
44 Claims
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1. A method of determining source location of energy carried in the form of propagating waves through a conducting medium comprising:
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a) detecting the waveform energy simultaneously at a plurality of points on, near, or in the conducting medium; b) recording the detected energy; c) isolating one or more modes of propagation of the energy through the medium; d) deriving source location by using generalized cross correlation of selected isolated modes of propagation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for isolating propagation modes of a wave-form energy propagating through a dispersive conductive medium in a relatively high ambient noise environment comprising:
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a) generating artificially a controlled wave-form energy in the conductive medium; b) transducing simultaneously the controlled wave-form energy at a plurality of discrete measurement points along the conductive medium to produce a multi-modal signal; c) spatially and temporally Fourier transforming the multi-modal signal into spatial and temporal domains; d) displaying mode curves from the Fourier transformation in a spatial/temporal frequency plane; e) recording the precise locations of each mode curve in the spatial/temporal frequency plane; f) monitoring for other wave-form energy in the conducting medium; g) detecting said other wave-form energy at a plurality of discrete measurement points along the conductive medium to produce a multi-modal signal; h) spatially and temporally Fourier transforming the multi-modal signal into spatial and temporal domains. - View Dependent Claims (42, 43, 44)
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Specification