Translator Disclaimer
Paper
15 April 2008 Imaging terahertz radar for security applications
Author Affiliations +
Abstract
Detection of concealed threats is a key issue in public security. In short range applications, passive imagers operating at millimeter wavelengths fulfill this task. However, for larger distances, they will suffer from limited spatial resolution. We will describe the design and performance of 0.8-THz imaging radar that is capable to detect concealed objects at a distance of more than 20 meter. The radar highlights the target with the built-in cw transmitter and analyses the returned signal making use of a heterodyne receiver with a single superconducting hot-electron bolometric mixer. With an integration time of 0.3 sec, the receiver distinguishes a temperature difference of 2 K at the 20 m distance. Both the transmitter and the receiver use the same modified Gregorian telescope consisting from two offset elliptic mirrors. The primary mirror defines limits the lateral resolution of the radar to 2 cm at 20 m distance. At this distance, the field of view of the radar has the diameter 0.5 m. It is sampled with a high-speed conical scanner that allows for a frame time less than 5 sec. The transmitter delivers to the target power with a density less than ten microwatt per squared centimeter, which is harmless for human beings. The radar implements a sensor fusion technique that greatly improves the ability to identify concealed objects.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexei Semenov, Heiko Richter, Ute Böttger, and Heinz-Wilhelm Hübers "Imaging terahertz radar for security applications", Proc. SPIE 6949, Terahertz for Military and Security Applications VI, 694902 (15 April 2008); https://doi.org/10.1117/12.778477
PROCEEDINGS
11 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

HI CLASS on AEOS a large aperture laser radar...
Proceedings of SPIE (December 27 2001)
GLINT: program overview and potential science objectives
Proceedings of SPIE (October 31 2000)
Sensor Concept Development For Hazard Detection
Proceedings of SPIE (February 01 1990)
Techniques for millimetre-wave imaging
Proceedings of SPIE (December 08 2004)
Review of imaging architecture
Proceedings of SPIE (July 29 2002)

Back to Top