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PHEMOS UV Imager Summary

PHEMOS UV Imager Summary. Status on Tasks. COM DEV and U of C signed a contract in December Provided feedback on science requirements Started to look at optical design Investigation into design concepts Reviewed some of the U of C optical designs generated on another program

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PHEMOS UV Imager Summary

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  1. PHEMOS UV Imager Summary

  2. Status on Tasks COM DEV and U of C signed a contract in December • Provided feedback on science requirements • Started to look at optical design • Investigation into design concepts • Reviewed some of the U of C optical designs generated on another program • Started to investigate image intensifier

  3. Summary of Issues/Questions • Can U of C provide zemax design files for their designs? • Environmental requirements? • What are the Performance Assurance requirements? (reference section 4.4.3 of PHEMOS SOW) • What is the life requirement? • Which way is 40 degree offset from nadir? In the orbit plane? Why is it there? Is it constant? • Solar illumination angles

  4. Image Intensifier Trades include; • Diameter 25 mm vs 40 mm • 25 mm smaller volume, 40 mm better SNR and better resolution/lower risk • Material, MgF2vs BaF2 • Photocathode material • ”Solar Blind” has better efficiency ~ 30 %, but poor vis rejection • Cesium Iodide very good visible rejection above 190 nm but low efficiency ~ 2% (cuts off quickly, so LBH-Low may have 3%) • KBr on MCP, better performance but would need likely development • Photocathode to MCP gap • 100 microns is performance limit, best spatial resolution • 200 microns lower vibration risk, but higher blurring

  5. Image Intensifier Trades include; • Phosphor material, likely P43 but others will be investigated • P43 has good efficiency, fast enough • MCP details • single stage vs double stage • Thickness, pore size, bias angle, voltage range • Number of fibre optic elements • 1, 2 or 3 • Impacts on risk and subcontract structure

  6. Summary • Requirements have been defined • Optical engineering team is engaged and ready to move ahead with optical design • Developing Image Intensifier conceptual design • CCD/CMOS selection will begin soon

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