Feedback Sensors for Closed Loop Additive In-Space Manufacturing

This solicitation calls for online quality control to be applied to In-Space Manufactured (ISM) additive manufactured parts. Our proposed approach is integrated precision scanning of the additive manufactured (AM) parts and feedback of that data back into AM layer by layer process control. The goal is to augment Space Manufacturing AM process controls with verifiable feedback enabling improved process stability and part quality to significantly reduce the risk associated with complex AM parts, especially those with critical hidden internal geometries or other features not readily measured with non-destructive tests/measurements.The proposed approach proposes to leverage and productize technology disclosed by the Marshall Space Flight Center in reference number MFS-TOPS-70 case number MFS-33013-2, a method that determines geometric differences (flaws) between the designed model and the printed part/component by employing IR cameras to collect accurate temperature data that can be validated against valid thermal models. We will add to that approach by also employing mature but improved NIR optical measurement to implement an additional function on the moving AM extrusion head. We then will employ the 3D data acquired by this embedded scanning sensor to (a) provide dimensional verification of part geometry after each deposition pass, and (b) when employed real time to modify machine control – likely requiring modification of the AM machine’s X, Y, Z, and feed rate controlling mechanisms that have to be different depending on ambient conditions (temp, humidity, and gravity) and deposited materials (plastic and plastic emulsion material differences).