US 11,725,932 B2
Video extensometer system with reflective back screen
Adrian Charles Riddick, Medfield, MA (US); Nicholas Francisco Salerno, Brighton, MA (US); Michael Ashman, Natick, MA (US); and Christian J. Hoehl, Ober-Ramstadt (DE)
Assigned to Illinois Tool Works Inc., Glenview, IL (US)
Filed by Illinois Tool Works Inc., Glenview, IL (US)
Filed on Jun. 5, 2020, as Appl. No. 16/894,113.
Claims priority of provisional application 62/866,379, filed on Jun. 25, 2019.
Prior Publication US 2020/0408509 A1, Dec. 31, 2020
Int. Cl. G01B 11/16 (2006.01); H04N 7/18 (2006.01); G06T 7/13 (2017.01)
CPC G01B 11/16 (2013.01) [G06T 7/13 (2017.01); H04N 7/183 (2013.01); G01N 2203/0016 (2013.01); G01N 2203/0647 (2013.01); G06T 2207/10048 (2013.01); G06T 2207/30204 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An extensometer system for measuring deformation on a test specimen comprising:
one or more light sources to direct light to a surface of a test specimen and a screen including a collimating filter, wherein the test specimen is arranged between the one or more light sources and the screen; and
an imaging device to capture images of the test specimen while subjected to a stress-inducing force via a testing system, the imaging device configured to transmit the images to a processor to calculate deformation of the test specimen as a result of the stress-inducing force.