Kutz, J; Vieweg, N; Naftaly, M; Wenzel, K; Kohlhaas, R B; Schell, M (2025) Continuous-Wave Terahertz Imaging of Embedded Multi-Dimensional Codes in 3D-Printed Polyamide Components. In: 2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 17-22 August 2025, Helsinki, Finland.

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Abstract

For the first time, we demonstrate the use of continuous-wave terahertz imaging for code identification in 3D printed samples for applications such as quality assurance, anticounterfeiting and supply chain management. We embed invisible coded structures within the body of 3D-printed polyamide components using selective laser sintering. While the plastic component is built up by sintering polyamide powder, the code is formed in-situ by leaving cavities of unmolten powder. These codes are non-destructively identified using continuous wave terahertz imaging. Various multi-dimensional codes are examined. We vary the type of the code and the depth of the structure beneath the surface and make use of the depth resolution, a unique feature of our terahertz instrument. All embedded features can be clearly identified.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Optical Radiation and Photonics > Materials and Appearance
Divisions:	Electromagnetic & Electrochemical Technologies
Publisher:	IEEE
Identification number/DOI:	10.1109/IRMMW-THz61557.2025.11320005
Last Modified:	23 Mar 2026 13:59
URI:	https://eprintspublications.npl.co.uk/id/eprint/10343