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The Near Infrared Coronagraphic Imager: NICI Update

The Near Infrared Coronagraphic Imager: NICI Update. Stop me if you’ve heard this one…. Insensitivity to Aft optics comes only from occulting mask. NICI-APD’s. NICI Occulting Masks. NICI Lenslet Array. Performance – Background Removal. Raw Difference. Avg. Profile Out.

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The Near Infrared Coronagraphic Imager: NICI Update

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  1. The Near Infrared Coronagraphic Imager: NICI Update

  2. Stop me if you’ve heard this one….. Insensitivity to Aft optics comes only from occulting mask.

  3. NICI-APD’s

  4. NICI Occulting Masks

  5. NICI Lenslet Array

  6. Performance – Background Removal Raw Difference Avg. Profile Out Scaled Difference rms ~ 10% rms ~ 10% rms ~ 2% All images are (A-B)/A - Plotted Range is +/- 0.5

  7. Performance – Background Removal After Coronagraph and Channel Difference Contrast Ratio to PSF Peak is ~16.7 mag @ 1.0 asec and 18.5 mag @ 1.5 asec

  8. NICI Performance

  9. NICI Performance

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