SMT Beam Efficiency


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SMT Beam Efficiency


 

   Click picture for larger view.

 

Measurements of Mars and Saturn for the above chart were done in fall 2007-spring 2008.  The beam efficiency is consistent across the 1 mm band.  A slight difference exists between hpol and vpol values due to optics-related beam squint.

The error values above are 95% confidence intervals.  Efficiencies were calculated using the technique described in Magnum (1993)1.  In our calculations, the factor of was omitted from equation 1 of Magnum (1993)1, because the SMT 1mm receiver is a single-sideband instrument.  For Tsaturn we used values plotted in Figure 4 of Weisstein & Serabyn (1994)2.  The measured nb values agree with the displayed Ruze formula:

where σ is the surface rms of the SMT (15 micron), ε is the aperture efficiency (0.64), and λ is the observing wavelength. 

A PDF file of this data located here.

1 Magnum, J.G. PASP, 1993, 105, p 117-122

2 Weisstein, E.W. & Serabyn, E. Icarus, 1994, 109, p 367-381


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Last updated: 11/08/11.