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Sensitive Broadband Receivers for Microwave Limb Sounding
Content Provider | Semantic Scholar |
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Author | Ward, John B. Lee, Kwanyoung Kawamura, Jon Chattopadhyay, Goutam Stek, P. J. Van |
Copyright Year | 2008 |
Abstract | − We present the measured performance of a sensitive new broadband receiver developed for a future microwave limb sounding instrument to map chemical species in the upper troposphere. This receiver will downconvert thermal emission spectra in the 180-280 GHz band using superconductor-insulator-superconductor (SIS) heterodyne mixers. The high spectral resolution achieved with heterodyne detection enables precision measurement of the profiles of pressure-broadened lines. Broad instantaneous bandwidth (24 GHz for a single mixer) enables multiple species to be measured simultaneously. The high sensitivity of this receiver and resulting short integration times, when combined with a novel optical configuration, will enable rapid horizontal and vertical scanning of the limb, resulting in three-dimensional maps of a large number of key chemical species in the trophosphere measured five to nine times per day over nearly the entire planet. |
File Format | PDF HTM / HTML |
Alternate Webpage(s) | https://esto.nasa.gov/2012test/conferences/estc2008/presentations/WardB2P2.pdf |
Alternate Webpage(s) | https://esto.nasa.gov/conferences/estc2008/papers/Ward_John_B2P2.pdf |
Language | English |
Access Restriction | Open |
Content Type | Text |
Resource Type | Article |