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|Author(s):||Shu Z. Lo; David R. Novotny; Erich N. Grossman; Edwin J. Heilweil;|
|Title:||Pulsed terahertz bi-directional reflection distribution function (BRDF) measurements of materials and obscurants|
|Published:||June 13, 2011|
|Abstract:||A pulsed terahertz imaging system modified to perform angular detection of light for quantitatively characterizing reflection and scattering from samples is reported. Reflection from a gold mirror shows that the full width half maximum (FWHM) of the terahertz beam angular spread is <1° with signal-to-noise of 65 dB. Two samples, a paper index card and a corduroy cloth sample were tested. The index card reflects ca. 1% of the incident terahertz energy with similar angular spreading while the corduroy sample reflected approximately 0.01% of the incident terahertz energy with FWHM of 5-10°. The corduroy sample also exhibits temporal pulse scattering as a function of angle which correlates with direct frequency domain measurements.|
|Conference:||SPIE Defense, Security & Sensing|
|Proceedings:||Paper 8022-14, Session: "Passive Milllimeter Wave Imaging Technology XIV"|
|Dates:||April 24-29, 2011|
|Keywords:||BRDF, concealed threat detection, terahertz reflection and scattering, terahertz imaging|
|Research Areas:||Terahertz Metrology|