Applications of mm-wave SIS mixers to middle atmosphere monitoring systems

Author

Suzuki, Hajime ; Imamura, T. ; Yokoyama, N. ; Suzuki, M. ; Ogawa, H. ; Kawabata, K. ; Fukui, Y.

Author_Institution

Fujitsu Labs. Ltd., Atsugi, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

3296

Lastpage

3299

Abstract

We have already developed a low-noise 100 GHz band (98-115 GHz) SIS mixer using Nb/AlOx/Nb junction technology. The mixer has a noise temperature of 17 K when used as a double sideband (DSB) heterodyne receiver. The SIS receiver has been in use in the 4 m radio telescope at Nagoya University for five years. As a further application of the SIS mixer, we developed middle-atmosphere ozone monitoring system using an SIS mixer for the first time. The system can measure ozone mixing ratio every 5 minutes. The integration time is less than 1/10 of the time needed in a conventional system using Schottky barrier diode (SBD) mixers. We have also begun developing developing a 200 GHz band (210-280 GHz) SIS mixer for radio astronomy and for monitoring other minor constituents such as ClO. The preliminary experiment showed that the mixer has a rather low noise temperature of 60 K (DSB).<>

Keywords

air pollution; air pollution measurement; atmospheric composition; atmospheric measuring apparatus; atmospheric techniques; meteorological instruments; millimetre wave detectors; millimetre wave devices; millimetre wave measurement; millimetre wave mixers; millimetre wave receivers; millimetre wave spectroscopy; ozone; pollution measurement; radiotelescopes; remote sensing; superconducting device noise; superconductor-insulator-superconductor mixers; 210 to 280 GHz; 98 to 115 GHz; ClO; MM-wave SIS mixers; Nb-AlO-Nb; Nb/AlOx/Nb junction; O/sub 3/; Schottky barrier diode; air pollution measurement; apparatus; astronomy; chemical composition; double sideband heterodyne receiver; instrument apparatus; mesosphere; middle atmosphere; mm-wave EHF millimetric spectroscopy; noise temperature; ozone monitoring; radioastronomy; radiotelescope; stratosphere; Atmosphere; Extraterrestrial measurements; Monitoring; Niobium; Radio astronomy; Receivers; Schottky barriers; Schottky diodes; Space technology; Temperature;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403296

Filename

403296