SALT PFIS Preliminary Design Review - PowerPoint PPT Presentation

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SALT PFIS Preliminary Design Review

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Opto-Mechanical Issues Lens mount design Sealed triplets, thermal effects, coating issues, etc. Assembly, alignment, and testing Collimator, camera, ... – PowerPoint PPT presentation

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Title: SALT PFIS Preliminary Design Review


1
Southern African Large Telescope Prime Focus
Imaging Spectrograph
  • Optical Integration and Test Plan
  • Eric B. Burgh
  • University of Wisconsin - Madison

2
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

3
Instrument Breakdown
  • Optics (Lenses/Filters)
  • Gratings
  • Fabry-Perot etalons
  • Polarimetric components
  • Detector Subsystem

4
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

5
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

6
Grating Tests
  • Throughput
  • Dispersion
  • Scattering
  • Reproducibility of a

VPH
Monochromatic beam
a
PMT/CCD
7
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

8
Polarimetric Components
  • Repeatability of wave-plate rotation
  • Wave-plate throughput
  • Polarimetric efficiency
  • Alignment and efficiency of mosaic beamsplitter

9
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

10
Integration
  • Mechanism mechanical integration
  • Control system integration
  • Verification of reproducible alignments
  • Change out of slits/gratings/filters

11
Required Lab Equipment
  • Monochromator
  • Continuum and Arc lamps
  • Phototubes/CCD detector
  • Multiple axis and rotating stages
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