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Proceedings Paper

THz impulse radar for biomedical sensing: nonlinear system behavior
Author(s): E. R. Brown; Shijun Sung; W. S. Grundfest; Z. D. Taylor
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Paper Abstract

The THz impulse radar is an “RF-inspired” sensor system that has performed remarkably well since its initial development nearly six years ago. It was developed for ex vivo skin-burn imaging, and has since shown great promise in the sensitive detection of hydration levels in soft tissues of several types, such as in vivo corneal and burn samples. An intriguing aspect of the impulse radar is its hybrid architecture which combines the high-peak-power of photoconductive switches with the high-responsivity and -bandwidth (RF and video) of Schottky-diode rectifiers. The result is a very sensitive sensor system in which the post-detection signal-to-noise ratio depends super-linearly on average signal power up to a point where the diode is “turned on” in the forward direction, and then behaves quasi-linearly beyond that point. This paper reports the first nonlinear systems analysis done on the impulse radar using MATLAB.

Paper Details

Date Published: 13 March 2014
PDF: 9 pages
Proc. SPIE 8941, Optical Interactions with Tissue and Cells XXV; and Terahertz for Biomedical Applications, 89411E (13 March 2014); doi: 10.1117/12.2044061
Show Author Affiliations
E. R. Brown, Wright State Univ. (United States)
Shijun Sung, Univ. of California, Los Angeles (United States)
W. S. Grundfest, Univ. of California, Los Angeles (United States)
Z. D. Taylor, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 8941:
Optical Interactions with Tissue and Cells XXV; and Terahertz for Biomedical Applications
E. Duco Jansen; Gerald J. Wilmink; Bennett L. Ibey; Robert J. Thomas, Editor(s)

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