US 12,085,473 B2
Deflectometry devices, systems and methods
Dae Wook Kim, Tucson, AZ (US); and Logan Rodriguez Graves, Tucson, AZ (US)
Assigned to Arizona Board of Regents on Behalf of the University of Arizona, Tucson, AZ (US)
Appl. No. 17/430,635
Filed by Arizona Board of Regents on Behalf of the University of Arizona, Tucson, AZ (US)
PCT Filed Feb. 24, 2020, PCT No. PCT/US2020/019451
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/176394, PCT Pub. Date Sep. 3, 2020.
Claims priority of provisional application 62/809,896, filed on Feb. 25, 2019.
Prior Publication US 2022/0146370 A1, May 12, 2022
Int. Cl. G01M 11/02 (2006.01); G01N 21/88 (2006.01)
CPC G01M 11/025 (2013.01) [G01N 21/8806 (2013.01); G01N 2021/8829 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A deflectometry system, comprising:
a light source including a plurality of light emitting devices arranged in a sequence to illuminate an object under test with incident light, wherein the object under test has a convex surface;
a detector positioned to receive a reflected light produced upon reflection of the incident light from the object under test or a transmitted light produced upon transmission of the incident light through the object under test; and
a movable stage for holding or securing the object under test, the movable stage configured to move in one or both of a translational or a rotational direction and to thereby cause the object under test to translate or rotate;
wherein the movable stage is configured to move in a plurality of steps such that, for each of the plurality of steps, the reflected light or the transmitted light received at the detector encompasses a portion of a full illumination space surrounding the object under test, wherein the detector's field of view is smaller than a full illumination space that contiguously surrounds the object under test, and the reflected light or the transmitted light received at the detector from all of the plurality of steps encompasses the full illumination space that contiguously surrounds the object under test.