Instrument Science Report CAL/FOS-068

"FOS Red Detector Plate Scale and Orientation"  November 1991

By: B. Bhattacharya and G. Hartig

Abstract excerpted from the report:

  Revised plate scale factors, as determined from SV 1528 data, are presented.
  Analysis of these data indicates changes in plate scale of -0.4% +/- 0.53%
  along the diode array and 2.9% perpendicular to the array.  The latter result
  is questionable due to the uncertainty in effective diode height.  A negli-
  gible change in orientation of the x-y axis of 0.24 degrees +/- 0.32 degrees
  is found.  These numbers indicate that the present scale factors of 1.43"
  per 256 y-base units and 0.357" per diode width are sufficiently accurate
  and do not need to be changed.


For more information, please contact the above authors.