Before CD13, we taped various holes in the optics box closed. The pupil image below shows that we got rid of our extraneous light in the optics box. This doesn't mean we've avoided scattered light. In fact, some scattered light is present in the pupil image at a hard stretch.
The data come from 110 ctdelay SUTR with 4 samples. I'm plotting the difference between frame 0 and frame 3 (9 second total integration) and the difference between having a basically closed optics box (5 micron filter, pinhole crossed with decker between dashes and slit/filter, and flip mirror halfway between settings) and one in normal pupil mode with 5 micron light.
The punchline is that we got rid of the light sources in the optics box that showed up at the IRTF. Another post will evaluate scattered light contribution in hi-med mode....
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