1. NIC Aperture, Pupil, and Filter Wheel Positions
Rev. 1.6
March 7, 2011
Oli Durney
LBTI Optical Engineer
Steward Observatory
University of Arizona

2. ND Wheel - Assembly
Neutral Density filter set: P/N FX from Janos Technology
Drawn as viewed with cover plate removed from Access Port side (side facing PICNIC Detector)
CW rotation of motor = CW rotation of wheel 1 2 3 4 5
Position Description Dimensions
1 (Home) Open f=25.4mm
2 OD=0.50, T=31.62% f=25.4mm, t=1mm
3 OD=1.00, T=10.00% f=25.4mm, t=1mm
4 OD=2.00, T=1.00% f=25.4mm, t=1mm
5 OD=3.00, T=0.10% f=25.4mm, t=1mm CW
NOTE: Optical Axis (Exit Port) is shown in red and is located at Position 1 when Wheel is in the Home position, Pos 1 will be replaced with an A/R coated ZnSe window

3. Optics Wheel – Assembly
CaF2 re-imaging lenses from ISP Optics
Drawn as viewed with cover plate removed from flat side (side facing PICNIC Detector)
CW rotation of motor = CW rotation of wheel 4 3 1 5 2 6
Position Description Dimensions
1 (Home) Open Open
2 Dual Large Lenses f=9.5mm, t=2.8mm
3 Open Open
4 Mixed Large/Small f=9.5mm, t=2.8mm
Lenses f=8.5mm, t=2.8mm
5 Open Open
6 Dual Small Lenses f=8.5mm, t=2.8mm CW
NOTE: Optical Axis (Exit Port) is shown in red and is located at Position 1 when Wheel is in the Home position

4. Mixed Large/Small Lenses
Optics Wheel – Cells
Dual Large Lenses
Mixed Large/Small Lenses
Dual Small Lenses

5. Prism Wheel - Assembly
Neutral Density filter set: P/N FX from Janos Technology
Drawn as viewed with cover plate removed from Baffle Tube side (side facing Field Lenses)
CW rotation of motor = CW rotation of wheel 1 4 5 2 3 6
Position Description Dimensions
1 (Home) Open Open
2 Dual Triplet Prisms 12x12mm
3 H Filter f=25.4mm
4 Single Triplet Prism 12x12mm
with H Filter
5 K Filter f=25.4mm
6 Single Triplet Prism 12x12mm
with K Filter CW
NOTE: Optical Axis (Entrance Port) is shown in red and is located at Position 1 when Wheel is in the Home position

6. Single Triplet Prism with Filter
Prism Wheel – Cells
Dual Triplet Prisms
Single Triplet Prism with Filter

7. NAC Aperture Wheel
ZnSe lenses and mirror from Edmund Optics
Drawn as viewed from cryostat Window side
CW rotation of motor = CW rotation of wheel 1 2 3 5 4 6
Position Name Size
1 (Home) Open x 42.86mm
2 Open f=25.4mm
3 3x3 Grid of Pinholes x 36.46mm
f=1mm, d=8.94mm
4 Znse Lens f=25.4mm
5 Open f=25.4mm
6 ZnSe Lens and 45° f=25.4mm
Fold Mirror CW
NOTE: Optical Axis (Entrance Port) is shown in red and is located at Position 1 when Wheel is in the Home position

8. LMIRCam Filter Wheel #1 7 6 8 9 5 4 10 CCW 11 3 2 12 1
Single Apertures installed on
Drawn as viewed with cover plate removed from Baffle Tube side (side facing LMIRCam Dichroic)
CW rotation of motor = CCW rotation of wheel
Position Name Size
1 (Home) Open 25.4mm
2 Small Dual Aperture f~7.19mm
3 Large Dual Aperture f~7.49mm
4 Left Aperture f~8.16mm
5 Right Aperture f~8.21mm
6 Open 25.4mm
7 Open 25.4mm
8 Open 25.4mm
9 Open 25.4mm
10 Open 25.4mm
11 Pinhole ~0.33mm
12 Blank 25.4mm 7 6 8 5 9 4 10
CCW 3 11 2 12 1
NOTE: Optical Axis (Entrance Port) is shown in red and is located at Position 1 when Wheel is in the Home position

9. LMIRCam Filter Wheel #2 1 2 12 11 3 4 10 CW 5 9 6 8 7
All filter retainer rings adjusted on , H & J filters installed on
Drawn as viewed with cover plate removed from flat side (side facing LMIRCam Baseplate)
CW rotation of motor = CW rotation of wheel
Position Name Size
1 (Home) Open 25.4mm
2 Blank 25.4mm
3 L-short ( mm) 25.4mm
4 Std ‘L’ ( mm) 25.4mm
5 L-long 1 ( mm) 25.4mm
6 L-long 2 ( mm) 25.4mm
7 Std ‘M’ ( mm) 25.4mm
8 M-long ( mm) 25.4mm
9 L-spec ( mm) 25.4mm
10 J ( mm ) 25.4mm
11 H ( mm) 25.4mm
12 Ks ( mm) 25.4mm 1 2 12 3 11 4 10 CW 5 9 6 8 7
NOTE: Optical Axis (Exit Port) is shown in red and is located at Position 1 when Wheel is in the Home position

10. LMIRCam Filter Wheel #3 4 3 5 6 2 1 7 CCW 12 8 11 9 10
New filter (Pos 10) installed on May 11, 2010
Drawn as viewed with cover plate removed from Baffle Tube side (side facing Biconic #2)
CW rotation of motor = CCW rotation of wheel
Position Name Size
1 (Home) Open 25.4mm
2 H2O Ice 1 ( mm) 25.4mm
3 H2O Ice 2 ( mm) 25.4mm
4 PAH 1 ( mm) 25.4mm
5 PAH 2 ( mm) 25.4mm
6 Br-a ( mm) 25.4mm
7 Br-a off ( mm) 25.4mm
8 L-cont 1 ( mm) 25.4mm
9 L-cont 2 ( mm) 25.4mm
10 L-cont 3 ( mm) 25.4mm
11 L-cont 4 ( mm) 25.4mm
12 Blank 4 3 5 2 6 1 7
CCW 12 8 11 9 10
NOTE: Optical Axis (Entrance Port) is shown in red and is located at Position 1 when Wheel is in the Home position

11. LMIRCam Filter Wheel #4 4 5 3 6 2 7 1 CW 8 12 9 11 10
PK-50 Blocker not installed because of OD clearance concern (substrate delivered with 2 chips)
Drawn as viewed with cover plate removed from Baffle Tube side (side facing detector)
CW rotation of motor = CW rotation of wheel
Position Name Size
1 (Home) Open 25.4mm
2 Blank 25.4mm
3 PK-50 Blocker 25.4mm
4 Pupil Imaging Lens (ZnSe) 12.7mm
5 Open 25.4mm
6 Open 25.4mm
7 Open 25.4mm
8 Open 25.4mm
9 Open 25.4mm
10 Open 25.4mm
11 Open 25.4mm
12 Open 25.4mm 4 5 3 6 2 7 1 CW 8 12 9 11 10
NOTE: Optical Axis (Exit Port) is shown in red and is located at Position 1 when Wheel is in the Home position

12. LMIRCam Aperture Wheel
New filter (Pos 10) installed on May 11, 2010
Drawn as viewed with cover plate removed from side opposite cryo-motor (side facing Biconic #2)
CW rotation of motor = CW rotation of wheel 2
Position Name Size
1 (Home) Open 50.8x50.8mm
2 Open 50.8x50.8mm
3 Pinhole 1mm?
4 Blank 50.8x50.8mm 3 1 CW 4
NOTE: Optical Axis (Exit Port) is shown in red and is located at Position 1 when Wheel is in the Home position