Application of Millimeter-Wave Radiometry for Remote Chemical Detection
Gopalsami, N.
Bakhtiari, S.
Elmer II, T.W.
Raptis, A.C.
Argonne Nat. Lab., Argonne;
This paper appears in: Microwave Theory and Techniques, IEEE Transactions on
Publication Date: March 2008
Volume: 56,
Issue: 3
On page(s): 700-709
Location: Scottsdale, AZ, USA,
ISSN: 0018-9480
INSPEC Accession Number: 9918491
Digital Object Identifier: 10.1109/TMTT.2008.916985
Current Version Published: 2008-03-05
Abstract
Passive millimeter-wave 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 line detection of industrial emissions is new. We developed a radiative transfer model to determine feasibility and system requirements for passive millimeter-wave spectral detection of terrestrial gases. We designed and built a Dicke-switched multispectral radiometer in the 146-154-GHz band to detect nitric oxide (NO), a prototypical gas of nuclear fuel processing operations. We first tested the spectral detection capability of the radiometer in the laboratory using a gas cell and then field tested it at the Nevada test site at a distance of 600 m from a stack that released hot plumes of NO and air. With features such as Dicke-switched integration, frequent online calibration, and spectral baseline subtraction, we demonstrated the feasibility of remote detection of terrestrial gases by a ground-based radiometer.
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