Ground-based atmospheric water vapor monitoring system with spectroscopy of radiation in 20-30 GHz and 50-60 GHz bands

Takeo Nagasaki; Osamu Tajima; Kentaro Araki; Hiroshi Ishimoto

doi:10.1117/12.2232277

27 July 2016 Ground-based atmospheric water vapor monitoring system with spectroscopy of radiation in 20-30 GHz and 50-60 GHz bands

Takeo Nagasaki, Osamu Tajima, Kentaro Araki, Hiroshi Ishimoto

Author Affiliations +

Proceedings Volume 9906, Ground-based and Airborne Telescopes VI; 99063K (2016) https://doi.org/10.1117/12.2232277
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

Takeo Nagasaki, Osamu Tajima, Kentaro Araki, and Hiroshi Ishimoto "Ground-based atmospheric water vapor monitoring system with spectroscopy of radiation in 20-30 GHz and 50-60 GHz bands", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063K (27 July 2016); https://doi.org/10.1117/12.2232277

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