In-situ large area optical strain measurement using an encoded dot pattern
First Claim
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1. A method of measuring strain in a test specimen, the method comprising the steps of:
- placing a pattern of marks on a surface of the test specimen, wherein the pattern of marks includes a plurality of target marks and a plurality of sets of coded marks, each set of coded marks defining a code that identifies a location of one of the target marks;
using the sets of coded marks to identify locations of at least two of the target marks; and
using a change in distance between at least two of the marks to determine strain in the test specimen.
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Abstract
A method of measuring strain in a test specimen comprises the steps of placing a pattern of marks on a surface of the test specimen, wherein the pattern of marks includes a plurality of target marks and a plurality of sets of coded marks, using the sets of coded marks to identify locations of at least two of the target marks, and using a change in distance between at least two of the marks to determine strain in the test specimen. An apparatus that performs the method is also provided.
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Citations
14 Claims
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1. A method of measuring strain in a test specimen, the method comprising the steps of:
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placing a pattern of marks on a surface of the test specimen, wherein the pattern of marks includes a plurality of target marks and a plurality of sets of coded marks, each set of coded marks defining a code that identifies a location of one of the target marks; using the sets of coded marks to identify locations of at least two of the target marks; and using a change in distance between at least two of the marks to determine strain in the test specimen. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a pattern of marks on a surface of the test specimen, wherein the pattern of marks includes a plurality of target marks and a plurality of sets of coded marks, each set of coded marks defining a code that identifies a location of one of the target marks; a sensor for detecting the pattern of marks; and a processor for using the coded marks to determine locations of at least two of the target marks, for measuring changes in distance between at least two of the marks, and for calculating strain in the test specimen based on the changes in distance. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification