Pulsed terahertz bi-directional reflection distribution function (BRDF) measurements of materials and obscurants

Shu-Zee A. Lo; David Novotny; Erich N. Grossman; Edwin J. Heilweil

doi:10.1117/12.883738

26 May 2011 Pulsed terahertz bi-directional reflection distribution function (BRDF) measurements of materials and obscurants

Shu-Zee A. Lo, David Novotny, Erich N. Grossman, Edwin J. Heilweil

Author Affiliations +

Proceedings Volume 8022, Passive Millimeter-Wave Imaging Technology XIV; 80220G (2011) https://doi.org/10.1117/12.883738
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

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.

Citation Download Citation

Shu-Zee A. Lo, David Novotny, Erich N. Grossman, and Edwin J. Heilweil "Pulsed terahertz bi-directional reflection distribution function (BRDF) measurements of materials and obscurants", Proc. SPIE 8022, Passive Millimeter-Wave Imaging Technology XIV, 80220G (26 May 2011); https://doi.org/10.1117/12.883738

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