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DM and INGRID+NAOMI pupil stop sizes
Date: 19 August 2003
A. Zurita (data taken by I. Soechting 17/7/03)
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-PI in the beam
-ifocus -1200 microns
-NAOMI on sky
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Image center radius outer diameter
(x,y) outer inner (in segments
(pixels) of DM)
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r606310.fit DM 634,488 120 -- 10 -> (24 pix/segm)
r606311.fit naomi-clr 642,484 82 -- 6.82 -> (~0.048mm/pix) (*)
r606312.fit naomi-obs 639,485 82 37 6.82
r606313.fit osca-clr 678,485 67 -- 5.58
r606314.fit osca-obs 675,488 67 29 5.58
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WHT PM ----- -- -- 7.2+/-0.2
naomi-s ----- 90 -- 7.5
naomi-l ----- 82 -- 6.82
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Therefore:
1/ The outer diameter of the naomi-clr & naomi-obs stops
is undersized by ~5%, which vignets ~10% of the DM
2/ The outer diameter of the osca-clr & osca-obs stops
is undersized by ~23%, which vignets ~40% of the DM
3/ The diameter of the central obscuration of the naomi-obs
stop corresponds to ~3.1 segments of the DM. Therefore it is
oversized by (3.1-2*sqrt(2))/(2*sqrt(2)) =9%, which vignets
aprox. 1.6% of the DM.
4/ The diameter of the central obscuration of the osca-obs
stop corresponds to ~2.4 segments of the DM. It does not
match the 4 central quadrants of the DM.
(*) Physical sizes of the INGRID stops:
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Inner Diameter Outer Diameter
(mm) (mm)
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naomi-clr ---- 3.895
naomi-obs 1.76 3.895
osca-clr ---- 3.22
osca-obs 1.377 3.22
naomi-l ---- 3.895 | old stops for INGRID+NAOMI
naomi-s ---- 4.305 |
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