Investigation of the transmission measurements of different clothing types at sub-terahertz for reflection imaging

Clifford Lindsay; Cecil S. Joseph; Michael A. King; Robert H. Giles

doi:10.1117/12.2513616

1 March 2019 Investigation of the transmission measurements of different clothing types at sub-terahertz for reflection imaging

Clifford Lindsay, Cecil S. Joseph, Michael A. King, Robert H. Giles

Author Affiliations +

Proceedings Volume 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII; 109172C (2019) https://doi.org/10.1117/12.2513616
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Transmission measurements of 11 different garments composed of different materials and different thickness under different conditions were measured. The setup consisted of a 100 Gigahertz camera system which used an IMPATT diode (66mW power output) as the source, a 32x32 image sensor array (1.5x1.5mm pixels, 1 nW/√Hz Noise Equivalent Power) focused with PTFE lens (50mm focal length). The camera system was configured for reflection imaging by placing the source emitter and imaging array at an off-axis angle and focused on a large flat mirrored surface. To simulate reflection of the emitted signal off human skin after transmission through the garments, we placed the garments over the mirrored surface. We then calculated the transmission loss, in terms of signal strength (amplitude), as the ratio of the recorded images with and without the garments. The materials and make-up of the garments were recorded, such as colors, accents, and thickness. To increase the realism of the data, we added several conditions for each garment transmission recording that included overlapping wrinkles and multiple garment layers. We were able to confirm transmission results reported from other research groups, but found that variations such as wrinkles and multiple layers can change the transmission ratios significantly.

Citation Download Citation

Clifford Lindsay, Cecil S. Joseph, Michael A. King, and Robert H. Giles "Investigation of the transmission measurements of different clothing types at sub-terahertz for reflection imaging", Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 109172C (1 March 2019); https://doi.org/10.1117/12.2513616

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