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In order to improve the performance of THz time-domain spectroscopy for the detection of hazardous substances in the field of civil security, the influence of surface roughness was studied. We performed transmission and reflection measurements of smooth and rough metallic and dielectric surfaces varying the degree of surface roughness and the tilt angle of the sample. The results were compared to...
Many chemicals, including hazardous substances, can be distinguished based on their spectral fingerprints in the terahertz range under laboratory conditions. In a real-world standoff environment, additional factors such as water vapor absorption in humid air, clothes and packaging materials, and the surface properties of the particular sample make this task more difficult. We have performed measurements...
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