Title :
A 110 GHz ozone radiometer with a cryogenically cooled planar Schottky mixer
Author :
Koistinen, O. ; Valmu, H. ; Raisanen, A. ; Vdovin, V. ; Dryagin, Y. ; Lapkin, I.
Author_Institution :
Helsinski Univ. of Technol., Espoo, Finland
Abstract :
A total power radiometer for monitoring the stratospheric ozone spectral line at 110 GHz is presented. Special features such as a cooled planar Schottky mixer as the front end and efficient reduction of standing waves in the quasi-optics are discussed in detail. The noise temperature of the receiver is 500 K (single sideband), and the total bandwidth of the receiver is 1 GHz. A dual acoustooptical spectrometer is used for the signal detection.<>
Keywords :
atmospheric measuring apparatus; microwave integrated circuits; mixers (circuits); ozone; radiometers; stratosphere; 1 GHz; 110 GHz; EHF microwave radiometry; O/sub 3/; atmosphere; chemical composition; cooled planar Schottky mixer; cryogenically cooled planar Schottky mixer; dual acoustooptical spectrometer; microwave spectra; noise temperature; ozone radiometer; quasi-optics; signal detection; standing waves; stratospheric ozone spectral line; total bandwidth; Amplitude modulation; Atmospheric measurements; Calibration; Electromagnetic wave absorption; Feeds; Filters; Frequency measurement; Radiometry; Schottky diodes; Temperature;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276759
