Southern African Large Telescope Prime Focus Imaging Spectrograph

Southern African Large Telescope Prime Focus Imaging Spectrograph Mechanical Mechanism Design Michael Smith University of Wisconsin - Madison Oct 17, 2001 SALT PFIS Preliminary Design Review 1

Introduction • Mechanism Preliminary Design Collimator Mechanisms Camera Mechanisms Articulation • Packaging • Lifting and Handling Oct 17, 2001 SALT PFIS Preliminary Design Review 2

Overview Near IR Shutter Mechanism Focus mechanism Grating mechanism Camera Tube Mirror mechanism Collimator Lens Holder Filter Mechanism Visible Beam Etalon Mechanisms Slit mask mechanism Wave plate mechanism Oct 17, 2001 SALT PFIS Preliminary Design Review 3

Slit Mask Mechanism Magazine Vertical Carrier CCD Camera Mirror Collimator Wave Plates Slit Masks First group lens mounting Focal Plane Rack Focal plane structure Horizontal Carrier Oct 17, 2001 SALT PFIS Preliminary Design Review 4

Slit Mask Mechanism Slit masks Stepper Motor & pinion Oct 17, 2001 Rack with engaging tooth SALT PFIS Preliminary Design Review 5

Wave Plate Mechanism Oct 17, 2001 SALT PFIS Preliminary Design Review 6

Wave Plate Mechanism Linear Slide Optical axis Wave plate in stacked arrangement Spur Gear Pinion Slim Section Bearings Rotational Motor Oct 17, 2001 SALT PFIS Preliminary Design Review 7

Mirror Mechanism Trunion Linear slide rails Beam location ( Z-axis) Motor - Linear actuation Base Plate Oct 17, 2001 SALT PFIS Preliminary Design Review 8

Near IR Camera Assembly Shutter Mechanism Grating mechanism Focus mechanism Filter Mechanism Etalon Mechanisms Oct 17, 2001 Articulation Bearing Articulation Drive Light entry SALT PFIS Preliminary Design Review CCD Camera with electronics 9

Focus Mechanism CCD Camera Collimator Focus Focal Plane Aerotech slide Lensholder Oct 17, 2001 ATS 0300 Series SALT PFIS Preliminary Design Review 10

Shutter Mechanism Aperture 162 mm CCD Camera Shutter Collimator Focal Plane Solenoid/Pneumatic Cylinder Oct 17, 2001 SALT PFIS Preliminary Design Review 11

Etalon Mechanism Etalon holder CCD Camera Etalons Collimator Linear slide Focal Plane Slide Base plate Pneumatic Cylinder Actuation Oct 17, 2001 SALT PFIS Preliminary Design Review 12

VPH Grating Mechanism Grating VPH Spectroscopy Grating in the beam Spring loaded set screw Grating housing Oct 17, 2001 Camera Structure CCD Rotational Stage (Newport) SALT PFIS Preliminary Design Review 13

Polarizer Mechanism Motor Polarizer in frame CCD Camera Polarizer Collimator Focal Plane Worm and worm gear Support mounting on camera structure Oct 17, 2001 SALT PFIS Preliminary Design Review 14

Filter Mechanism Magazine Motion of Carrier CCD Camera Base plate for carrier Collimator Filter Focal Plane Carrier Motion of filter from magazine to carrier to holder Filter Holder Oct 17, 2001 SALT PFIS Preliminary Design Review 15

Articulation Mechanism Motor Camera Articulates 0 -90 degrees Camera Tube Roller I Beam with gear cut on top flange Oct 17, 2001 Pinion mates with gear on I Bottom rollers beam with flexure SALT PFIS Preliminary Design Review 16

Packaging • Optical and mechanism sub-assemblies removable and packed in hard, padded, air-tight containers. • Frame structure packed in custom made crate. • Same container for transport and storage for swap-out items like etalons. • Instrument designed to facilitate easy dismantling, packing and reassembly. • On-site verification of optical alignment after reassembly. Oct 17, 2001 SALT PFIS Preliminary Design Review 17

Lifting & Handling 1400 x 1400 Separator Frame 700 mm 2500 mm 12 Fixture Points Oct 17, 2001 SALT PFIS Preliminary Design Review 18