Mechanical Changes Required Due to Proposed IRMS Rx V2
description
Transcript of Mechanical Changes Required Due to Proposed IRMS Rx V2
Mechanical Changes Required Due to Proposed IRMS Rx
V2
R. WeberSeptember 27, 2011
2
Windows & CSU• No changes required for
window mounts• Because of the flip in curvature
of the focal surface, the CSU supports will need to be shortened by ~4 mm so that the focus is at the incoming edge of the central masking bar, rather than the exiting edge. Or, the instrument could be positioned ~4 mm further from NFIRAOS.
TMT focus(blue arc)
Keck focus(ends of ray pencils)
Masking bar thickness
9/8/2011
3
Field Lens• Girdle thickness
increased from 11.5 to 12.9 mm- better for bonding
• Center of girdle shifted 2.694 mm towards CSU- lens mount flexure pockets machined deeper in cell
9/8/2011
MOSFIRE (solid)IRMS (transparent)
4
Collimator Barrel• Girdle center shifts: Col #2=
-0.5 mm, Col #3= 2.7 mm, Col #4= 1.6 mm, Col #5= 0.03 mm, Col #6= -0.05 mm.
• These relatively small shifts in the lens girdle centers should be achievable through a combination of cell spacer shim alterations and/or altering mount flexure pocket depths.
• Girdle widths are all comparable or slightly larger than MOSFIRE design- no bonding issues.
9/8/2011
MOSFIRE lenses(solid)
IRMS lenses(transparent)
5
Camera Barrel: (Cells #1-#4)• Cell #1: girdle center shifts -
2.0 mm and girdle thickness increases by 0.8 mm to 12.0 mm; minor cell spacer shim modifications required.
• Cell #2: girdle center shifts -1.6 mm and girdle thickness remains the same; minor cell spacer shim modifications required.
• Cell #3: girdle center shifts -1.9 mm and girdle thickness decreases by 0.7 mm to 52.7 mm; minor cell spacer shim modifications required.
• Cell #4: girdle center shifts -1.9 mm and girdle thickness increases by 0.6 mm to 11.1 mm; minor cell spacer shim modifications required.
9/8/2011
MOSFIRE lenses(solid)
IRMS lenses(transparent)
6
Camera Barrel: (Cells #5, #6, & Field Flattener/Detector)
• Cell #5: girdle center shifts -0.8 mm and girdle thickness increases by 1.8 mm to 9.9 mm; minor cell spacer shim modifications required.
• Cell #6: girdle center shifts -1.4 mm and girdle thickness decreases by 2.2 mm to 26.3 mm; minor cell spacer shim modifications required.
• Field flattener/detector: girdle center shifts -1.2 mm and girdle thickness increases by 0.6 mm to 9.9 mm; minor cell spacer shim modifications required.
9/8/2011 IRMS focal surface
MOSFIRE lenses(solid)IRMS lenses
(transparent)