Title:
Development of a Real-Time Geometric Quality Monitoring System for 3D Printed Concrete Filaments Using a Rotating Nozzle and 2D Laser Detection
Author(s):
Jung-Hoon Kim
Publication:
Web Session
Volume:
ws_F23_Jung-Hoon Kim.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/29/2023
Abstract:
Effective geometric quality assurance for 3D Concrete Printing (3DCP) requires automated, real-time, cost-effective and non-destructive methods. In this regard, this study presents the working operation of a newly developed automated test for monitoring the width, thickness, and cross-sectional area of extruded filaments. The hardware of the quality monitoring system consists of a rotating nozzle and a laser triangulation-type 2D laser detection system, which consists of a 2D line laser and a CMOS camera. It is specifically designed for real-time use while considering the requirements for the camera's field of view (FOV), minimum object distance (MOD), physical dimensions and weight requirement suitable for the rotating nozzle. Unlike previous research, the rotatable nozzle attached to the 3D printer allows monitoring the extrusion for all directions along the printing path. The proposed processing algorithm to compute the profile information of extruded filament involves image segmentation, extraction, and clustering for laser profile, coordinate transformation, estimation of reference ground line, and calculation of the geometry of the filament. The basic performance test under static conditions shows a sufficient accuracy of 0.087mm in FOV, and the experimental results demonstrate the feasibility of the developed system for in-situ quality monitoring during the 3DCP process.