A Millimeter-wave Instrument for Use in a Synergistic, optical/millimeter-wave Approach to Pollution Monitoring

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Presented at Combined Optical, Microwave, Earth and Atmosphere Sensing, March 1993. Published in Proceedings of the IEEE Topical Symposium.

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A multisensor approach is being developed at the University of Texas at Arlington (UTA) to improve upon current capabilities in environmental monitoring. These sensors consist of an FT-IR for operation in the near to thermal infrared regions of the spectrum, a long-path UV (LPUV) system and an active/passive millimeter-wave instrument that will operate over the 75-1 10 GHz window. This report will discuss how we expect the synergistic capability to work and will describe in some detail the design of the millimeter-wave instrument. Field-portable FT-IR instruments have been used effectively to monitor a limited number of gaseous pollutants but are limited by interference from CO2 and H20 and, for longer hydrocarbon chains, by spectral overlap. UV instruments, on the other hand, are much more sensitive but many gases do not exhibit spectral absorption (emission) in the UV. It is known that various hydrocarbons, NO,, 03 and other gases have rotational lines in the 75-1 10 GHz region, and narrow-bandwidth millimeter-wave instruments are now being effectively utilized to monitor trace gases in the stratosphere. Use of a wide-bandwidth millimeter-wave system is now being proposed for environmental monitoring at lower altitudes. are considered in this report include antenna and front-end mixer selection, active/passive mode selections and parallel/serial channel tradeoffs. For this instrument 1200OK (cooled) effective noise is expected.


Electrical and Computer Engineering | Engineering

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