Long-Range Non-Line of Sight THz Sensing

Batra, Aman; Alam, Jahangir; Wiemeler, Michael; Goehringer, Diana; Kaiser, Thomas

doi:10.1109/irmmw-thz50926.2021.9566989

Cited by 1 publication

(1 citation statement)

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“…To reduce the deleterious effects of scatter, it is reasonable to consider using THz radiation for further improvement. Previous active THz methods for estimating the location of NLOS objects have been based on a time-of-flight principle [21][22][23]. However, these methods require high-power THz light sources, which increases the complexity of the instrumentation and may reveal an attempt to detect hidden objects.…”

Section: Introductionmentioning

confidence: 99%

Maximizing the non-line-of-sight information content retrievable from passive scattered light fields: a comparison between visible, long wave infrared, and terahertz radiation

Sasaki,

Leger

2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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We explore the use of plenoptic data for performing passive non-line-of-sight imaging using light scattered from interior hallways at visible, long-wave infrared, and terahertz frequencies. The use of longer wavelength radiation in the LWIR and THz bands can increase the retrievable NLOS image information in comparison to visible radiation. However, significant scattering effects at LWIR wavelengths and diffraction effects at the millimeter wavelengths of THz radiation present unique optical design challenges. In this paper, by assuming a general imaging system for light field capture, we provide a theoretical framework to describe measured NLOS information including scattering and diffraction effects. Our analysis combines a ray-based light field description of the plenoptic space with a Wigner distribution function formalism to provide an intuitive physical understanding of the limits of NLOS imaging. Further, based on the analysis, we provide a simple strategy to design optical measurement systems in the LWIR and THz wavelength ranges.

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Section: Introductionmentioning

confidence: 99%