A wide-band radiometer for the short-wavelength part of the millimeter range based on a superconducting point contact

Details A wide-band radiometer for the short-wavelength part of the millimeter range based on a superconducting point contact A wide-band radiometer for the short-wavelength part of the millimeter range based on a superconducting point contact

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sva....22..506a&link_type=abstract

(Astronomicheskii Zhurnal, vol. 55, July-Aug. 1978, p. 888-895.) Soviet Astronomy, vol. 22, July-Aug. 1978, p. 506-510. Transla

Astronomy and Astrophysics

Astronomy

1

Microwave Radiometers, Millimeter Waves, Radio Astronomy, Solar Radio Emission, Superconductors, Black Body Radiation, Earth Atmosphere, Frequency Modulation, Infrared Radiation, Optical Filters, Radio Frequencies, Radio Transmission, Spectral Energy Distribution, Telescopes, Time Constant

Scientific paper

A wideband radiometer for astronomical observations in the short end of the millimeter wave band with a superconducting point contact as the sensitive element is described. Radiation at the input of the quasi-optical channel is modulated with a frequency of 400 MHz, transmitted through a series of filters, and enters a detector section consisting of a superconducting point contact with holders and a device permitting the alignment of the contact. The best measured fluctuation sensitivity of the radiometer to blackbody radiation is 0.01 K at a time constant of 1 sec, with limiting sensitivity of about 8 x 10 to the -14th W per square root Hz at 1mm wavelength and about 2 x 10 to the -14th W per square root Hz at 1.87 mm. Test observations of the sun were performed and the spectral response of the radiometer to solar radiation transmitted by the atmosphere is presented.

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