Remote detection of chemicals with passive millimeter waves

N. Gopalsami; S. Bakhtiari; T. W. Elmer; A. C. Raptis

doi:10.1117/12.690212

25 October 2006 Remote detection of chemicals with passive millimeter waves

N. Gopalsami, S. Bakhtiari, T. W. Elmer, A. C. Raptis

Proceedings Volume 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II; 63781A (2006) https://doi.org/10.1117/12.690212
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

Passive millimeter-wave (mmW) systems have been used in the past to remotely map solid targets and to measure low-pressure spectral lines of stratospheric and interstellar gases; however, its application to pressure-broadened spectral detection of terrestrial gases is new. A radiative transfer model was developed to determine the detection feasibility and system requirements for passive mmW spectral detection. A Dicke-switched multispectral radiometer that operates at 146-154 GHz was designed and built for remote detection of stack gases. The radiometer was tested in the laboratory using a gas cell; the spectra of acetonitrile were detected passively against a cold background, which mimicked typical remote detection scenarios in the field. With Dicke-switched integration of radiometric signals, on-line calibration, and novel signal processing to minimize atmospheric fluctuation, spectral line detection of polar molecules is possible from chemical plumes a few kilometers away.

Citation Download Citation

N. Gopalsami, S. Bakhtiari, T. W. Elmer, and A. C. Raptis "Remote detection of chemicals with passive millimeter waves", Proc. SPIE 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II, 63781A (25 October 2006); https://doi.org/10.1117/12.690212

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