Passive millimeter wave imaging and spectroscopy system for terrestrial remote sensing

Nachappa Gopalsami; Shaolin Liao; Eugene R. Koehl; Thomas W. Elmer; Alexander Heifetz; Hual-Te Chien; Apostolos C. Raptis

doi:10.1117/12.850123

24 April 2010 Passive millimeter wave imaging and spectroscopy system for terrestrial remote sensing

Nachappa Gopalsami, Shaolin Liao, Eugene R. Koehl, Thomas W. Elmer, Alexander Heifetz, Hual-Te Chien, Apostolos C. Raptis

Author Affiliations +

Proceedings Volume 7670, Passive Millimeter-Wave Imaging Technology XIII; 767003 (2010) https://doi.org/10.1117/12.850123
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

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 3^rd dimension, and time is the 4^th 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.

Citation Download Citation

Nachappa Gopalsami, Shaolin Liao, Eugene R. Koehl, Thomas W. Elmer, Alexander Heifetz, Hual-Te Chien, and Apostolos C. Raptis "Passive millimeter wave imaging and spectroscopy system for terrestrial remote sensing", Proc. SPIE 7670, Passive Millimeter-Wave Imaging Technology XIII, 767003 (24 April 2010); https://doi.org/10.1117/12.850123

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