Terahertz Dynamic Aperture Imaging at Standoff Distances Using a Compressed Sensing Protocol

In this paper, results of a 0.35 THz dynamic aperture imaging approach are presented. The experiments use an optical modulation approach and a single pixel detector at a standoff imaging distance of \approx1 m. The optical modulation creates dynamic apertures of 5-cm diameter with \approx2000 indivi...

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Bibliographic Details
Published in:IEEE transactions on terahertz science and technology 2019-07, Vol.9 (4), p.364-372
Main Authors: Augustin, Sven, Jung, Peter, Frohmann, Sven, Hubers, Heinz-Wilhelm
Format: Article
Language:English
Subjects:
Aperture imaging
Apertures
Calibration
Compressed sensing
Computational imaging
Detectors
Field of view
Germanium
Imaging
inverse problems
Modulation
Optical modulation
spatial light modulators (SLMs)
terahertz (THz) imaging
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Summary:In this paper, results of a 0.35 THz dynamic aperture imaging approach are presented. The experiments use an optical modulation approach and a single pixel detector at a standoff imaging distance of \approx1 m. The optical modulation creates dynamic apertures of 5-cm diameter with \approx2000 individually controllable elements. An optical modulation approach is used here for the first time at a large far-field distance, for the investigation of various test targets in a field-of-view of 8 × 8 cm^{2}. The results highlight the versatility of this modulation technique and show that this imaging paradigm is applicable even at large far-field distances. It proves the feasibility of this imaging approach for potential applications like standoff security imaging or far field THz microscopy.
ISSN:2156-342X
2156-3446
DOI:10.1109/TTHZ.2019.2915640