The field of terahertz (THz) imaging based on time-domain spectroscopy (TDS), a versatile technique for gathering images that enable us to “see through” plastics, textiles, and cardboard, has made enormous progress during the past two decades. Terahertz wavelengths—ranging from approximately 30 µm to 3 mm—are strongly absorbed by liquids and metal material, which makes terahertz imaging ideal for use identifying such materials in applications like airport security scanners and food inspection.
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Source: NDT
