25 October 2006 Remote detection of chemicals with passive millimeter waves
Author Affiliations +
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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. Gopalsami, N. Gopalsami, S. Bakhtiari, S. Bakhtiari, T. W. Elmer, T. W. Elmer, A. C. Raptis, 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); doi: 10.1117/12.690212; https://doi.org/10.1117/12.690212
PROCEEDINGS
12 PAGES


SHARE
Back to Top