29 July 2003 Powder retection with T-ray imaging
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Pulsed THz imaging systems have a number of potential advantages in inspection applications. They provide amplitude and phase information across a broad spectral range in the far-infrared, and many common packaging materials are relatively transparent in this frequency range. We use T-ray imaging to allow the identification of different powdered materials concealed inside envelopes. Using the terahertz spectral information we show that different powders may be uniquely identified. Different thicknesses of the powders are imaged to investigate the influence of scattering on the measured THz pulses and the classification model is extended to allow it to identify different materials independent of the material thickness.
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Bradley S. Ferguson, Bradley S. Ferguson, Shaohong Wang, Shaohong Wang, Hua Zhong, Hua Zhong, Derek Abbott, Derek Abbott, Xi-Cheng Zhang, Xi-Cheng Zhang, } "Powder retection with T-ray imaging", Proc. SPIE 5070, Terahertz for Military and Security Applications, (29 July 2003); doi: 10.1117/12.504294; https://doi.org/10.1117/12.504294


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