Fast Active THz Cameras with Ranging Capabilities |
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Authors: | Christian am Weg Wolff von Spiegel Ralf Henneberger Ralf Zimmermann Torsten Loeffler Hartmut G Roskos |
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Affiliation: | 1.Physikalisches Institut,Johann Wolfgang Goethe-Universit?t,Frankfurt,Germany;2.RPG Radiometer Physics GmbH,Meckenheim,Germany;3.SynView GmbH,Glashütten,Germany |
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Abstract: | We report on the realization of two active, fully electronic THz cameras, both operating at room temperature, but at different
frequencies (645 GHz and 300 GHz, respectively). Active illumination together with the frequency-modulated-continuous-wave
(FMCW) approach allows us to implement unique features such as phase-sensitive detection, suppression of spurious reflections
and high resolution ranging. The measuring of the phase of the THz wave allows for sub-wavelength depth resolution while the
ranging capabilities enable us to acquire an absolute depth map of objects under test with accuracy in the mm range. With
both systems, we are able to acquire images with more than 55,000 pixels (phase and amplitude) in 9 seconds and the dynamic
range exceeds 35 dB. The typical object distance is about 75–150 cm and the image size is in the order of hundreds of cm2 suitable for stand off detection of concealed weapons. |
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