Terahertz imaging: a new non-destructive technique for the quality control of plastic weld joints
By S. Wietzke, C. Jördens, N. Krumbholz, B. Baudrit, M. Bastian, Martin Koch. 2007
149 citations recorded by the source corpus.
We present the first investigation of plastic weld joints using terahertz waves. Terahertz time-domain spectroscopy clearly reveals contaminations like metal or sand within the weld joint of two high-density polyethylene sheets. Furthermore, areas can be identified where the welding process has failed and the parts to be joined are separated by a small air gap. We show that a three layer structure of polyethylene-air-polyethylene has a characteristic, frequency-dependent transmission behaviour. This allows for a distinction between welded and non-welded material as well as for the calculation of the air layer thickness from the relative transmission spectrum. Consequently, terahertz time-domain spectroscopy provides a promising new non-destructive and even contactless technique, which is desired by the plastics industry for detecting a variety of deviations from the ideal welding process.
Subfields: Astronomy and Astrophysics, Ecology, Evolution, Behavior and Systematics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/d334b1f96d72e96d3ec7f688fc30a27672631852
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Citations in the corpus
- Review of Terahertz Tomography Techniques (2014, background): “In the polymer industry online supervision of polymeric processes (for example a real time paint meter [107]), quality control of plastic weld joints [108], conductive properties [109], determination of moisture level [110], the fiber orientation [111] and the glass-transition temperature of polymer”
- A Survey of Terahertz Applications in Cultural Heritage Conservation Science (2011, background): “The nondestructive, nonsampling reconstruction of the internal structures of heritage objects provides valuable information about the structure, construction and life history of the object, while potentially also revealing any obscured content.”