The Detection of Moisture Content and the Delamination of Thermally Modified Woods Based on Terahertz Time-Domain Spectroscopy

As commonly used materials in building and interior furniture decoration, wood materials should be processed via the pyrolysis technique in order to improve their corrosion resistance, flame retardancy, and dimensional stability. However, during the process of pyrolysis, temperature and time are significant factors for avoiding internal damage. The main reason comes from the decrease in internal structural water. Existing non-destructive evaluation methods have difficulty detecting moisture content and delamination within wood due to its complex internal structure. In this work, a novel image processing method is proposed to detect the delamination of wood materials. The results show that, compared to spruce and oak, meranti is more resistant to pyrolysis and has a higher structural stability.