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Proceedings Paper

Ground-based atmospheric water vapor monitoring system with spectroscopy of radiation in 20-30 GHz and 50-60 GHz bands
Author(s): Takeo Nagasaki; Osamu Tajima; Kentaro Araki; Hiroshi Ishimoto
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Paper Abstract

We propose a novel ground-based meteorological monitoring system. In the 20{30 GHz band, our system simultaneously measures a broad absorption peak of water vapor and cloud liquid water. Additional observation in the 50{60 GHz band obtains the radiation of oxygen. Spectral results contain vertical profiles of the physical temperature of atmospheric molecules. We designed a simple method for placing the system atop high buildings and mountains and on decks of ships. There is a simple optical system in front of horn antennas for each frequency band. A focused signal from a reflector is separated into two polarized optical paths by a wire grid. Each signal received by the horn antenna is amplified by low-noise amplifiers. Spectra of each signal are measured as a function of frequency using two analyzers. A blackbody calibration source is maintained at 50 K in a cryostat. The calibration signal is led to each receiver via the wire grid. The input path of the signal is selected by rotation of the wire grid by 90°, because the polarization axis of the reflected path and axis of the transparent path are orthogonal. We developed a prototype receiver and demonstrated its performance using monitoring at the zenith.

Paper Details

Date Published: 27 July 2016
PDF: 5 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063K (27 July 2016); doi: 10.1117/12.2232277
Show Author Affiliations
Takeo Nagasaki, High Energy Accelerator Research Organization, KEK (Japan)
Osamu Tajima, High Energy Accelerator Research Organization, KEK (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Kentaro Araki, Meteorological Research Institute (Japan)
Hiroshi Ishimoto, Meteorological Research Institute (Japan)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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