Non-destructive determination of electromagnetic properties
First Claim
1. A method, comprising:
- directing electromagnetic energy toward an article under test;
taking measurements of electromagnetic energy scattered by the article under test;
determining expected baseline values of at least one electromagnetic property of the article under test, wherein the expected baseline values are determined based on measurements of electromagnetic energy scattered by a control article;
determining a difference between the expected baseline values and characteristic values of the article under test, wherein the characteristic values of the article under test are determined based on measurements of electromagnetic energy scattered by the article under test; and
determining output data based on the determined difference between the expected baseline values and the characteristic values of the article under test, wherein the output data includes values that indicate a distribution of the at least one electromagnetic property of the article under test, and wherein the output data is determined using a distorted wave Born approximation and singular value decomposition to estimate values of an electromagnetic field internal to the article under test based on the measurements of the electromagnetic energy scattered by the article under test.
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Accused Products
Abstract
Systems and methods to determine electromagnetic properties are provided. A particular method includes directing electromagnetic energy toward an article under test. The method also includes taking measurements of electromagnetic energy scattered by the article under test. The method further includes determining expected baseline values of at least one electromagnetic property of the article under test. The expected baseline values are based on electromagnetic energy scattered by a control article. The method also includes determining output data based on a difference between the expected baseline values and characteristic values of the article under test determined based on the measurements of electromagnetic energy scattered by the article under test. The output data includes values indicative of inhomogeneous distribution of an electromagnetic property of the article under test.
33 Citations
19 Claims
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1. A method, comprising:
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directing electromagnetic energy toward an article under test; taking measurements of electromagnetic energy scattered by the article under test; determining expected baseline values of at least one electromagnetic property of the article under test, wherein the expected baseline values are determined based on measurements of electromagnetic energy scattered by a control article; determining a difference between the expected baseline values and characteristic values of the article under test, wherein the characteristic values of the article under test are determined based on measurements of electromagnetic energy scattered by the article under test; and determining output data based on the determined difference between the expected baseline values and the characteristic values of the article under test, wherein the output data includes values that indicate a distribution of the at least one electromagnetic property of the article under test, and wherein the output data is determined using a distorted wave Born approximation and singular value decomposition to estimate values of an electromagnetic field internal to the article under test based on the measurements of the electromagnetic energy scattered by the article under test. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable storage medium, comprising:
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instructions executable by a processor to access expected baseline values of an article under test, wherein the expected baseline values are determined based on measurements of electromagnetic energy scattered by a control article; instructions executable by the processor to determine difference values between the expected baseline values and characteristic values of the article under test, wherein the characteristic values of the article under test are determined based on measurements of electromagnetic energy scattered by the article under test when an electromagnetic plane wave is directed toward the article under test; and instructions executable by the processor to generate output data based on the determined difference values, wherein the output data indicates a distribution of an electromagnetic property of the article under test, and wherein the output data is generated using a distorted wave Born approximation and singular value decomposition to estimate values of an electromagnetic field internal to the article under test based on the measurements of the electromagnetic energy scattered by the article under test. - View Dependent Claims (11, 12, 13, 14)
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15. A system, comprising:
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an antenna to direct an electromagnetic plane wave toward an article under test; at least one probe to take measurements of electromagnetic energy scattered by the article under test; a memory storing expected baseline values of at least one electromagnetic property of the article under test, wherein the expected baseline values are determined based on measurements of electromagnetic energy scattered by a control article; and a processor to; determine difference values between the expected baseline values and a plurality of measured characteristic values of the article under test, wherein the plurality of measured characteristic values are determined based on the measurements of electromagnetic energy scattered by the article under test; and generate output data based on the determined difference values that indicate a distribution of the at least one electromagnetic property of the article under test, wherein the output data is generated using a distorted wave Born approximation and singular value decomposition to estimate values of an electromagnetic field internal to the article under test based on the measurements of the electromagnetic energy scattered by the article under test. - View Dependent Claims (16, 17, 18, 19)
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Specification