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SWAP Calibration

SWAP Calibration. 30-Nov-2006 Jean-Marc Defise - CSL jmdefise@ulg.ac.be. Calibration. Image quality Overall throughput Pixel-to-pixel non-uniformities (flatfield, vignetting) Noise (electronic & straylight). Component procurement. Mirrors integration. Flight unit. Instrument

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SWAP Calibration

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  1. SWAP Calibration 30-Nov-2006 Jean-Marc Defise - CSL jmdefise@ulg.ac.be SCSL Meeting – ISSI, 29-30 Nov 2006

  2. Calibration • Image quality • Overall throughput • Pixel-to-pixel non-uniformities (flatfield, vignetting) • Noise (electronic & straylight) Component procurement Mirrors integration Flight unit Instrument design • Compon. Characteriz° • Mirror WFE • Sensor throughput+FF • Filters • EUV l Theoretical response Update instr. baseline • Telescope quality • Real WFE • Vignetting (baffles) • VIS l • End-to-end tests • Throughput • Flatfield • Vignetting • Straylight • Noise • VIS l • EUV l SCSL Meeting – ISSI, 29-30 Nov 2006

  3. SWAP “NON” OPTICAL ELEMENTS Baffles • vignetting Electronics • digitization • noise • compression Thermal status • noise • Image quality OPTICAL ELEMENTS Mirrors + EUV coatings • figuring • reflectivity EUV filters • throughput • light leaks • optical impact (grid) Sensor + scintillator coating • throughput • flatfield • noise SCSL Meeting – ISSI, 29-30 Nov 2006

  4. Component calibration See previous SCSL meeting SCSL Meeting – ISSI, 29-30 Nov 2006

  5. SWAP Filters 2 possibilities (Luxel): • Al filters (150 nm) + grid mesh (80 to 83 %) optical impact, but high throughput better mechanical resistance • Al filters (150 nm) + polyimid (70 nm) lower EUV transmission FOCAL FILTER ENTRANCE FILTER SCSL Meeting – ISSI, 29-30 Nov 2006

  6. SWAP Filters Grid filters SEM picture SCSL Meeting – ISSI, 29-30 Nov 2006

  7. SWAP Filters Grid filters – diffraction (entrance filter) SCSL Meeting – ISSI, 29-30 Nov 2006

  8. SWAP Filters Grid filters – shadowing (focal plane filter) SCSL Meeting – ISSI, 29-30 Nov 2006

  9. SWAP Filters Polyimid filters (entrance filter) SEM pictures SCSL Meeting – ISSI, 29-30 Nov 2006

  10. SWAP: System Response updated with filter selection CMOS HAS + Scintillator + Prox Eln QS: 182 ph/s/px Update:QS: 335 ph/s/px AR: 2686 ph/s/px Update: AR: 4842 ph/s/px QS: 6 DN/s/px Update: QS: 11 DN/s/px AR: 89 DN/s/px Update: AR: 159 DN/s/px - worst case assumption, EOL with HAS @ 0°C - new noise figures to be measured with real FM electronics SCSL Meeting – ISSI, 29-30 Nov 2006

  11. Image Quality Confirmed only by interferometric measurement at 633nm No possibility for direct measurement in EUV (need EUV collimator, diffraction is dominating in VIS) WFE maps at 633 nm can provide estimate for PSF at 17.4 nm – BUT without scattering Scattering could be evaluated with PTB nearly-collimated beam (?) SCSL Meeting – ISSI, 29-30 Nov 2006

  12. Calibration during TV @ CSL Real thermal environment with all flight electronics (IIU, PE) but MCPM • Noise evaluation (dark images) at OP temperature • Cal. diodes reference images at OP temperature 2 diodes can illuminate directly the CMOS l = 570 nm Will fly in SWAP FM unit SCSL Meeting – ISSI, 29-30 Nov 2006

  13. End-to-end calibration Planned at PTB in Jan’07 (week #3) • Spectral scan • FoV scan (throughput + possibly EUV flat field) • Out-of-FoV scan (offpointings) SCSL Meeting – ISSI, 29-30 Nov 2006

  14. PTB Beam Characteristics • 1010photons/sec at 17 nm. Can easily be adjusted for smaller intensities. • Shape of the beam: 1 x 1 mm² • can be decreased to 0.5 x 0.5 mm² • larger beam can be available, but homogeneity decreases • divergence ~6.8 arcmin (130 pixels spot diam in SWAP focal plane) • Spectral purity depends on the flux intensity, hence on the limiting slot, which will be adjusted before the instrument calibration, and before off-axis measurements SCSL Meeting – ISSI, 29-30 Nov 2006

  15. SWAP Chamber @ PTB • SWAP FM unit • on a goniometer mount • + translation stage • beam position will be adjusted • FoV scan • out-of-FoV scan EUV Beam SCSL Meeting – ISSI, 29-30 Nov 2006

  16. SWAP Calibration @ PTB • SWAP FM will be in the chamber with the IIU FM • A cooling system will be connected to the radiator mount, nominal -20°C but will be -40°C for out of FoV scans • FoV Scan => mosaic 3 x 3 or more if achievable.This should provide some data for flat field. • Out of FoV scan => straylight check for offpointings(need high detectivity, -40°C) SCSL Meeting – ISSI, 29-30 Nov 2006

  17. SWAP Calibration @ PTB • Pupil FoV scan with the 1 mm² beam (vignetting verification) • Spectral scan from 16.5 to 20.0 nm SCSL Meeting – ISSI, 29-30 Nov 2006

  18. SWAP Calibration @ PTB • Open point: • FM front filter during PTB calibration ? • risky (pressure sensitive, contamination sensitive) • in any case, focal filter will be present • any possibility to calibrate it separately ? • use a spare filter @ PTB ? SCSL Meeting – ISSI, 29-30 Nov 2006

  19. SWAP in-orbit calibration • SWAP diodes (VIS only) • LYRA • Flatfield with offpointing manoeuvers ? • Intercalibration with other instruments ?EIT, SDO, STEREO ? SCSL Meeting – ISSI, 29-30 Nov 2006

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