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Proceedings Paper

Fast active THz camera with range detection by frequency modulation
Author(s): C. am Weg; W. von Spiegel; R. Henneberger; R. Zimmermann; T. Loeffler; H. G. Roskos
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Paper Abstract

We report on the realization of two active fully electronic THz cameras operating at different frequencies (645 GHz and 300 GHz) and room temperature. Active illumination together with the frequency modulation continuous wave approach allows us to implement unique features, such as phase-sensitive detection, working-distance selection and the suppression of spurious reflections. With both systems we are able to acquire images with more than 50000 pixels (phase and amplitude) in 9 seconds. The dynamic range exceeds 35 dB and we achieve a subwavelength depth resolution due to the measurement of the phase. The typical object distance is about 50-100 cm and the image size is on the order of hundreds of cm2. With frequency modulation of the source we are furthermore able to detect the position form objects up to an accuracy of a few mm.

Paper Details

Date Published: 12 February 2009
PDF: 8 pages
Proc. SPIE 7215, Terahertz Technology and Applications II, 72150F (12 February 2009); doi: 10.1117/12.808806
Show Author Affiliations
C. am Weg, Johann Wolfgang Goethe-Univ. Frankfurt am Main (Germany)
W. von Spiegel, Johann Wolfgang Goethe-Univ. Frankfurt am Main (Germany)
R. Henneberger, Radiometer Physics GmbH (Germany)
R. Zimmermann, Radiometer Physics GmbH (Germany)
T. Loeffler, Loeffler Technology GmbH (Germany)
H. G. Roskos, Johann Wolfgang Goethe-Univ. Frankfurt am Main (Germany)

Published in SPIE Proceedings Vol. 7215:
Terahertz Technology and Applications II
Kurt J. Linden; Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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