Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009stt..conf..242t&link_type=abstract
Proceedings of the 20th International Symposium on Space Terahertz Technology, held April 20-22, 2009, in Charlottesville, VA, U
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A calibration load unit has been constructed and implemented for the Submillimeter Array (SMA). This unit incorporates an ambient load and a heated load, in addition to a waveplate assembly. The unit is installed inside the SMA antenna cabin near the compact image plane along the SMA beam waveguide. The loads are constructed from a matrix of 9 RAM tiles with a clear aperture diameter of 75 mm. The heated load is heated through the copper plate on which the RAM tiles are mounted, and the temperature of the plate is servo controlled. A 3 micron thick mylar window is used to reduce the effects of convection cooling. Both loads can slide in and out of the signal beam under computer control. The target temperatures of the ambient and heated loads are 15 and 55 degrees C respectively. An in-situ calibration procedure has been developed to calibrate the radiation temperature of the heated load. The procedure includes a modulated noise injection technique to remove any non-linearity of the receivers.
Blundell Ray
Christensen Ronald
Leiker S.
Paine Scott
Papa D.
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