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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. - PowerPoint PPT Presentation
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The Near InfraredCoronagraphic Imager:NICI Update
Stop me if you’ve heard this one…..
2
for aft
2
for aft
22
for aft
Mask
( ) Mask
Mask Mask
o o
o o o
PSF P P
P P L P
I P L P P
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 Scaled Difference
rms ~ 10% rms ~ 2%
All images are (A-B)/A - Plotted Range is +/- 0.5
rms ~ 10%
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
NICI Performance
NICI Performance
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