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Testing had identified multiple sources of stray light in ViSP. Some stray light enters from the sides and top at the end of the camera arms that were open to the environment. Installation of various baffles was done between May and June. These were successful in reducing the stray light from external sources. Data taken through at least OCP 1.4 (ended 06/17/2022) will be contain stray light from this source.
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Spatial scale for demodulation sampling is yet to-be-finalized.
We are currently investigating several sources of spurious polarized background signals. The QUV continuum error levels are at variable levels around 1%.
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Data analysis and testing has identified multiple sources of stray light in ViSP. One set of tests done with showed that a significant part of the stray light enters from the sides and top at the end of the camera arms that were open to the environment. Reduction of stray light to about the same level as during a dark current observation with the GOS dark shutter in the beam was only possible when both the camera arms and camera lenses where completely covered. Installation of various baffles was done between May and June. These were successful in reducing the stray light from external sources. Data taken through at least OCP 1.4 (ended 06/17/2022) will be contain stray light from this source.
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