Time shift data analysis for long-range guided wave inspection
First Claim
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1. A method of using long range guided wave inspection techniques to detect geometric irregularities in a cylindrical shell structure, comprising the steps of:
- generating a first long range wave from a first probe at a first probe position along the cylindrical shell, wherein the first long range wave travels substantially in one direction from the probe along a length of the structure;
acquiring a first data set representing reflection signals reflected from an irregularity to the first probe;
generating a second long range wave from a second probe at a second probe position along the cylindrical shell having a known separation from the first probe position, wherein the second long range wave travels in the same direction relative to the first long range wave;
acquiring a second data set representing reflection signals reflected from the irregularity to the second probe position;
wherein the first probe and the second probe are external to the structure;
wherein the first long range wave and the second long range wave are substantially of a single wave mode of a fixed order, both propagated in a single direction relative to each other;
identifying peak signal values in the first data set and in the second data set, thereby obtaining a first set of peak signal values and a second set of peak signal values;
associating each peak signal value with an occurrence time;
time-shifting one set of peak signal values by an amount equal to the roundtrip time of the first long range wave over the distance between the first probe and the second probe;
determining a coincidence in time of values in the shifted set of peak signal values and values in the unshifted set of peak signal values; and
interpreting coincident values as corresponding to an irregularity in the structure.
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Abstract
A method of analysis long range guided wave data reflected from defects and geometric features such as welds in a structure. The method involves acquiring two sets of data, and time shifting one set of data relative to the other. Data points that match in time after the shifting are considered to represent defects or geometric features in the structure. The result of the method is exclusion of false signal data and automation of data analysis.
48 Citations
22 Claims
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1. A method of using long range guided wave inspection techniques to detect geometric irregularities in a cylindrical shell structure, comprising the steps of:
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generating a first long range wave from a first probe at a first probe position along the cylindrical shell, wherein the first long range wave travels substantially in one direction from the probe along a length of the structure; acquiring a first data set representing reflection signals reflected from an irregularity to the first probe; generating a second long range wave from a second probe at a second probe position along the cylindrical shell having a known separation from the first probe position, wherein the second long range wave travels in the same direction relative to the first long range wave; acquiring a second data set representing reflection signals reflected from the irregularity to the second probe position; wherein the first probe and the second probe are external to the structure; wherein the first long range wave and the second long range wave are substantially of a single wave mode of a fixed order, both propagated in a single direction relative to each other; identifying peak signal values in the first data set and in the second data set, thereby obtaining a first set of peak signal values and a second set of peak signal values;
associating each peak signal value with an occurrence time;time-shifting one set of peak signal values by an amount equal to the roundtrip time of the first long range wave over the distance between the first probe and the second probe; determining a coincidence in time of values in the shifted set of peak signal values and values in the unshifted set of peak signal values; and interpreting coincident values as corresponding to an irregularity in the structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of using long range guided wave inspection techniques to detect geometric irregularities in a conduit, comprising the steps of:
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generating a first long range wave from a first probe at a first probe position along the conduit, wherein the first long range wave travels substantially in one direction from the first probe along a length of the conduit; acquiring a first data set representing reflection signals reflected from an irregularity in the conduit to the first probe; generating a second long range wave from a second probe at a second probe position along the conduit having a known separation from the first probe position, wherein the second long range wave travels in the same direction relative to the first long range wave; acquiring a second data set representing reflection signals reflected from the irregularity in the conduit to the second probe position; wherein the first probe and the second probe are external to the conduit; wherein the first long range wave and the second long range wave are substantially of a single wave mode of a fixed order, propagated in a single direction relative to each other; identifying peak signal values in the first data set and in the second data set, thereby obtaining a first set of peak signal values and a second set of peak signal values;
associating each peak signal value with an occurrence time;time-shifting one set of peak signal values by an amount equal to the roundtrip time of the first long range wave over the distance between the first probe and the second probe; determining a coincidence in time of values in the shifted set of peak signal values and values in the unshifted set of peak signal values; and interpreting coincident values as corresponding to an irregularity in the conduit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification