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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Southern African Large Telescope Prime Focus Imaging Spectrograph
Optical Integration and Test PlanEric B. Burgh
University of Wisconsin - Madison
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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Opto-Mechanical Issues
• Lens mount design– Sealed triplets, thermal effects, coating issues, etc.
• Assembly, alignment, and testing– Collimator, camera, gratings, etalons, etc.
• Integration with mechanisms
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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Instrument Breakdown
• Optics (Lenses/Filters)• Gratings• Fabry-Perot etalons• Polarimetric components• Detector Subsystem
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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Optics
Lens mounting:
• Coefficient of thermal expansion– Fused silica 0.5 x 10-6 K-1
– NaCl 44 x 10-6 K-1
• Sealed NaCl triplets– Protection from moisture
– Mounting issues
• AR Coatings– SolGel/MgF2
– Ruggedness
– Application within mounts
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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Optics (continued..)
• Alignment– Collimator (degree of collimation, focus travel)
– Camera (focus)
• Transmission / image quality– Integrated collimator / camera setup
– Various combinations of filters
– (Image quality testing with Detector Subsystem?)
• Slit mask verification– Measure width, edge roughness, relative slit positions
to verify within tolerances
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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Grating Tests
• Throughput• Dispersion• Scattering• Reproducibility of
VPHMonochromatic beam
PMT/CCD
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Fabry-Perot Etalons
• Initial testing performed at Rutgers University• Integration with PFIS at UW-Madison
– Assembly with structure
– Alignment with optics
– Sensitivity to degree of collimation
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Polarimetric Components
• Repeatability of wave-plate rotation• Wave-plate throughput• Polarimetric efficiency• Alignment and efficiency of mosaic beamsplitter
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Detector Subsystem
Tests that need the Detector Subsystem:• Image quality v. field position• Field flatness/distortions• Instrumental scattered light• Detector pixel scale• Grating resolution• End-to-end throughput/detection efficiency
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Oct 17, 2001 SALT PFIS Preliminary Design ReviewOptical Integration and Test Plan
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Integration
• Mechanism mechanical integration• Control system integration• Verification of reproducible alignments• Change out of slits/gratings/filters
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Required Lab Equipment
• Monochromator• Continuum and Arc lamps• Phototubes/CCD detector• Multiple axis and rotating stages