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Proceedings Paper

Passive millimeter wave imaging and spectroscopy system for terrestrial remote sensing
Author(s): Nachappa Gopalsami; Shaolin Liao; Eugene R. Koehl; Thomas W. Elmer; Alexander Heifetz; Hual-Te Chien; Apostolos C. Raptis
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Paper Abstract

We have built a passive millimeter wave imaging and spectroscopy system with a 15-channel filter bank in the 146-154 GHz band for terrestrial remote sensing. We had built the spectroscopy system first and have now retrofitted an imaging element to it as a single pixel imager. The imaging element consisted of a 15-cm-diameter imaging lens fed to a corrugated scalar horn. Image acquisition is carried out by scanning the lens with a 2-axis translation stage. A LabVIEW-based software program integrates the imaging and spectroscopy systems with online display of spectroscopic information while the system scans each pixel position. The software also allows for integrating the image intensity of all 15 channels to increase the signal-to-noise ratio by a factor of ~4 relative to single channel image. The integrated imaging and spectroscopy system produces essentially 4-D data in which spatial data are along 2 dimensions, spectral data are in the 3rd dimension, and time is the 4th dimension. The system performance was tested by collecting imaging and spectral data with a 7.5-cm-diameter and 1m long gas cell in which test chemicals were introduced against a liquid nitrogen background.

Paper Details

Date Published: 24 April 2010
PDF: 7 pages
Proc. SPIE 7670, Passive Millimeter-Wave Imaging Technology XIII, 767003 (24 April 2010); doi: 10.1117/12.850123
Show Author Affiliations
Nachappa Gopalsami, Argonne National Lab. (United States)
Shaolin Liao, Argonne National Lab. (United States)
Eugene R. Koehl, Argonne National Lab. (United States)
Thomas W. Elmer, Argonne National Lab. (United States)
Alexander Heifetz, Argonne National Lab. (United States)
Hual-Te Chien, Argonne National Lab. (United States)
Apostolos C. Raptis, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 7670:
Passive Millimeter-Wave Imaging Technology XIII
David A. Wikner; Arttu R. Luukanen, Editor(s)

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