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Millimeter and terahertz waves offer novel solutions for nondestructive testing such as imaging and layer thickness measurements within dielectrics. For the thickness measurement of plastics, we use the frequency modulation continuous wave technique within fully electronic terahertz systems. The available modulation bandwidth inherently restricts the resolution to several millimeters. Our correlation...
Many established terahertz imaging modalities are on one side restricted by the tradeoff between resolution and field of view such as in the case of focal plane arrays and on the other side suffer from a limited depth of field such as in the case of quasi-optical terahertz imaging configurations. Furthermore, typical scanning solutions require time-consuming measurement procedures and restrict significant...
Broadband laser based terahertz systems for multilayer thickness inspections are getting established in industrial environments, such as in the quality control for paint processes in the automotive industry. Within this contribution we address another highly attractive and complementary industrial terahertz application by the thickness and density inspection of thick and multilayer plastics as for...
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