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This is a perspective view of the inside of the Odin cold area showing
an example of the 3-dimensional quasi-optical ray tracing analysis
that was done for the Odin radiometer. From the mixer point of view
(in yellow in the right side of the image) you see the 35db edge taper
envelope of a Gaussian beam (in green) emanating from the
feedhorns. After passing through a polarizing grid for separation into
the two channels, the beam reflects off a mirror and then out of the
cold box. The contours of the mirror shown here are in dB relative
power where the beam strikes the surface of the off axis ellipsoid
mirror. The inner contour is -5dB followed outwards by -15dB, -25dB
and -35dB. The last contour shows the physical boundary of the mirror
in the slab of aluminium.
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