Patent ID: 11867668
Assignee: ILLINOIS TOOL WORKS INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A system for correcting for a variable thickness of a test specimen, the system comprising:
a testing system to secure a test specimen;
a screen to provide illumination to silhouette the test specimen;
an imaging device arranged opposite the screen relative to the test specimen and configured to capture images of the test specimen; and
a processing system to:
determine a calibration distance between an imaging device and a calibration plane associated with the testing system;
receive a thickness of a test specimen, the thickness corresponding to a distance between first and second surfaces of the test specimen, wherein the test specimen is arranged such that the first surface is a first distance from the imaging device and the second surface being a second distance from the imaging device;
calculate a correction factor based in part on the calibration distance and a correction distance equivalent to a difference between a measurement plane and the calibration plane, wherein the correction distance is equivalent to one half of the thickness;
image one or more of a marking on the first surface of the test specimen or a silhouette of the test specimen to measure one or more characteristics of the test specimen, wherein the first surface of the testing specimen corresponds to the measurement plane, the measurement plane being offset from the calibration plane by a measurement distance; and
generate one or more corrected characteristics by applying a correction factor to the measurements of the one or more characteristics of the test specimen.