This paper presents the research and development of
two terahertz imaging systems based on photonic and electronic
principles, respectively. As part of this study, a survey of ongoing
research in the field of terahertz imaging is provided focusing on
security applications. Existing terahertz imaging systems are reviewed
in terms of the employed architecture and data processing
strategies. Active multichannel measurement method is found to be
promising for real-time applications among the various terahertz
imaging techniques and is chosen as a basis for the imaging instruments
presented in this paper. An active system operation allows
for a wide dynamic range, which is important for image quality.
The described instruments employ a multichannel high-sensitivity
heterodyne architecture and aperture filling techniques, with close
to real-time image acquisition time. In the case of the photonic
imaging system, mechanical scanning is completely obsolete. We
show 2-D images of simulated 3-D image data for both systems.
The reconstruction algorithms are suitable for 3-D real-time operation,
only limited by mechanical scanning.
- submillimeter-wave technology
- photonic systems
- Femtosecond systems
- submillimeter-wave imaging
- photonic detectors
- synthetic aperture imaging
- terahertz imaging
- synthetic aperture radar
Krozer, V., Löffler, T., Dall, J., Kusk, A.
, Eichhorn, F., Olsson, R. K., ... Jensen, T.
(2010). Terahertz Imaging Systems With Aperture Synthesis Techniques
. I E E E Transactions on Microwave Theory and Techniques
(7), 2027 - 2039. https://doi.org/10.1109/TMTT.2010.2050246