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1. (WO2018125596) SENSOR THAT SIMULATES RESIN OPTICAL PROPERTIES

Pub. No.:    WO/2018/125596    International Application No.:    PCT/US2017/066366
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 15 00:59:59 CET 2017
IPC: B29C 64/135
B29C 64/393
Applicants: 3D SYSTEMS, INC.
Inventors: COOPER, Guthrie
Title: SENSOR THAT SIMULATES RESIN OPTICAL PROPERTIES
Abstract:
A method and system for calibrating a three dimensional printing system (2) includes a specialized sensor (48). The three dimensional printing system forms a three dimensional article of manufacture through a layer-by-layer process. Layers are formed by the operation of a light engine (10) selectively curing photocure resin onto a face of the three dimensional article of manufacture. The sensor includes a photodetector (52) overlaid by an optical element (54, 55, 56). The optical element simulates a "dense portion" of an optical path between the light engine and the face of the three dimensional article of manufacture being formed. The "dense portion" of the optical path includes a layer of photocure resin that is disposed between the light engine and the face of the three dimensional article of manufacture.