Real-Time Identification and Characterization of Asbestos and Concrete Materials With Radioactive Contamination

Applications of Terahertz Spectroscopy in the Field of Construction and Building Materials

“…Thus, the absorption coefficients of different wood species are approximately in proportion to timber densities as shown in Figure 3C. In fact, hardwood species such as oak have higher THz attenuation and softwoods such as pine have lower THz attenuation (51). THz system has been used to distinguish between the surrounding ordinary wood and higher-absorption knotted areas ( Figures 3A and 3B) (18,48).…”

“…However, the long-term exposure to airborne asbestos fibers is dangerous for humans and can cause asbestos-related diseases. Xu and Zhang (51) reported that THz TDS can be applied to analyze the presence of asbestos in building materials due to the higher attenuation coefficient that occurs in the samples with asbestos and its unique spectral absorption between 1.2 and 1.4 THz. Another possible use of THz imaging system is the detection of corrosion in pipes under thin insulation materials such as mineral wool without removing the covering material.…”