Oct 17, 2001 SALT PFIS Preliminary Design Review 1
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 2
Introduction
• Mechanism Preliminary DesignCollimator Mechanisms
Camera Mechanisms
Articulation
• Packaging• Lifting and Handling
Oct 17, 2001 SALT PFIS Preliminary Design Review 3
Overview
Focus mechanism
Filter Mechanism
Camera Tube
Slit mask mechanism
Wave plate mechanism
Mirror mechanism
Shutter Mechanism
Etalon Mechanisms
Grating mechanism
Near IR
Visible Beam
Collimator Lens Holder
Oct 17, 2001 SALT PFIS Preliminary Design Review 4
Slit Mask Mechanism
Focal plane structure
First group lens mounting
Horizontal Carrier
Vertical CarrierMagazine
Rack
Collimator
Wave Plates
Focal Plane
CameraCCD
Slit Masks
Mirror
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Slit Mask MechanismSlit masks
Rack with engaging tooth
Stepper Motor & pinion
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Wave Plate Mechanism
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Wave Plate Mechanism
Rotational Motor
Linear Slide
Wave plate in stacked arrangement Slim
Section BearingsSpur Gear
Pinion
Optical axis
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Mirror Mechanism
Motor - Linear actuationBeam location
( Z-axis)
Base Plate
Trunion
Linear slide rails
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Camera Assembly
Focus mechanism
Filter Mechanism
CCD Camera with electronics
Shutter Mechanism
Etalon Mechanisms
Grating mechanism
Near IR
Light entry
Articulation Bearing Articulation Drive
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Focus Mechanism
Lensholder Aerotech slide
ATS0300 Series
Collimator
Focal Plane
CameraCCD
Focus
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Shutter MechanismAperture 162mm
Solenoid/Pneumatic Cylinder
Collimator
Focal Plane
CameraCCD
Shutter
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Etalon Mechanism
Linear slide
Etalon holder
Slide Base plate
Pneumatic Cylinder Actuation
Collimator
Focal Plane
CameraCCD
Etalons
Oct 17, 2001 SALT PFIS Preliminary Design Review 13
VPH Grating Mechanism
Grating in the beam
Camera Structure
Grating housing
Spring loaded set screw
Rotational Stage (Newport)
VPHSpectroscopy
CCD
Grating
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Polarizer Mechanism
Polarizer in frame
Worm and worm gear
Support mounting on camera structure
Motor
Collimator
Focal Plane
CameraCCD
Polarizer
Oct 17, 2001 SALT PFIS Preliminary Design Review 15
Filter Mechanism
Base plate for carrier
Magazine
Motion of filter from magazine to carrier to holder
Carrier
Filter Holder
Motion of Carrier
Collimator
Focal Plane
CameraCCD
Filter
Oct 17, 2001 SALT PFIS Preliminary Design Review 16
Articulation Mechanism
Roller Pinion mates with gear on I beam
Camera Tube
Motor
I Beam with gear cut on top flange
Bottom rollers with flexure
Camera Articulates 0-90 degrees
Oct 17, 2001 SALT PFIS Preliminary Design Review 17
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 18
Lifting & Handling
2500mm
700mm
1400 x 1400 Separator
Frame
12 Fixture Points