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US 11,455,737 B2Granted
Multiple-scale digital image correlation pattern and measurement
AssigneeThe Boeing Company
InventorsJames A. Grossnickle, James E. Pillers, Kevin Earl McCrary
Life of this patent
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Abstract
A method and apparatus for digital image correlation. A camera system is used to obtain larger scale images of a larger scale dot pattern on a surface of a workpiece and smaller scale images of a smaller scale dot pattern on the surface of the same workpiece. The smaller scale dot pattern forms a larger dot in the larger scale dot pattern in the larger scale images. The larger scale images and the smaller scale images may be used to determine a measurement of the workpiece.
Claims14
A system, comprising:
- a workpiece;
- a first plurality of dots disposed on a surface of the workpiece, wherein:
- the first plurality of dots forms a first dot pattern at a first scale;
- the first plurality of dots comprises a first dot;
- and
- the first dot comprises a second plurality of dots forming a second dot pattern at a second scale, the second scale smaller than and disposed within the first scale, the first plurality of dots and the second plurality of dots configured to provide a stress measurement for the workpiece;
- a first set of cameras having a first field of view and a first focus, the first set of cameras configured for first imaging individual dots in the first plurality of dots at the first scale the first field of view disposed within the first dot pattern;
- a second set of cameras having a second field of view and a second focus, the second set of cameras configured for second imaging individual dots in the second plurality of dots at the second scale, the second field of view smaller than the first field of view, the second field of view disposed within the second dot pattern, wherein first imaging and second imaging are configured to occur simultaneously;
- and
- a digital image correlation system configured to analyze characteristics of the workpiece at the first scale and the second scale by digital image correlation of a first plurality of baseline images with a second plurality of successive images, wherein:
- each of the first plurality of baseline images is simultaneously captured at both the first scale and the second scale;
- each of the second plurality of successive images is simultaneously captured at both the first scale and the second scale;
- and
- the digital image correlation between the first plurality of baseline images and the second plurality of successive images determines the stress measurement for the workpiece.
11 more elements
A method, comprising:
- obtaining, by a camera system, first scale images of a first scale dot pattern on a surface of a workpiece;
- obtaining, by the camera system, second scale images of a second scale dot pattern on the surface of the workpiece, wherein:
- each dot of the first scale dot pattern comprises smaller dots of the second scale dot pattern;
- the second scale dot pattern is smaller than and disposed within the first scale dot pattern;
- the camera system is comprised of a first set of cameras and a second set of cameras, the first set of cameras having a first field of view and a first focus corresponding to individual dots in the first scale dot pattern, the second set of cameras having a second field of view and a second focus corresponding to individual dots in the second scale dot pattern, the second field of view smaller than the first field of view, the second focus different than the first focus;
- and
- obtaining the first scale images and obtaining the second scale images occurs simultaneously;
- and
- determining a stress measurement for the workpiece by performing a digital image correlation between baseline images and successive images, wherein:
- the baseline images comprise a first plurality of the first scale images and the second scale images;
- the successive images comprise a second plurality of the first scale images and the second scale images;
- the first plurality of the first scale images and the second scale images are different than the second plurality of the first scale images and the second scale images;
- the baseline images are simultaneously captured at the first field of view and the second field of view;
- and
- the successive images are simultaneously captured at the first field of view and the second field of view.
12 more elements
Dependencies are inferred from the claim text.