مشخصات ساختاری مواد عایق حرارتی با استفاده از طیف سنجی تراهرتز و تصویربرداری پالس تراهرتز

Terahertz (THz) spectroscopy and imaging is used to analyse different types of thermal building insulation materials. First, the absorption coefficients of polymer foams are calculated, showing an inverse relationship with thermal conductivity. In addition, manufacturing imperfections and internal structures within the foams are clearly visualized with THz amplitude imaging. Secondly, different fibre orientations within aerogel composite blanket are recognized in THz spectra and amplitude images. Lastly, the phase transition of microencapsulated phase-change material is indicated by occurrence of spectral peaks in THz spectrum. The selected method is promising for a non-destructive testing of the thermal insulation material properties and structure.