1 / 16

UV detectors for solar observations

UV detectors for solar observations. Udo Schühle, MPAE, 26 June 2003. TRACE-image of the Sun in the EUV. Emission spectra of the Sun in the VUV. The quest for higher resolution. 0.5 Arcsec ~ 350 km at Sun. Photocathode materials. FUV VUV. Multichannel plate (MCP) detectors.

royce
Download Presentation

UV detectors for solar observations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. UV detectors for solar observations Udo Schühle, MPAE, 26 June 2003 TRACE-image of the Sun in the EUV Emission spectra of the Sun in the VUV

  2. The quest for higher resolution 0.5 Arcsec ~ 350 km at Sun

  3. Photocathode materials FUV VUV

  4. Multichannel plate (MCP) detectors

  5. Readout schemes of microchannel plate detectors Cross delay line anode + time to digital converter Cross strip anode + charge ratio centroiding

  6. Anode design options • Wedge and strip anode • Cross Delay line anode • Cross strip anode • CCD

  7. Example: flatfield of SUMER XDL detector • Distortion • ADC nonlinearity • Multifiber bundles (hexagonal) • Moire pattern (from 3 MCPs) • Dead pores

  8. Flatfield pattern & resolution • Pore structure limiting the resolution • Multifiber bundle boundaries • Moire pattern by superposition of MCPs

  9. Intensified CCD MCP coupled to CCD via lens or fiber-optic taper

  10. Sensor substrate detector SiN SiN UBM UBM Au Indium Indium Au UBM Al SiO SiO CMOS ROIC Hybrid design with wide band gap material e. g. GaN MSM-Photoconductor Sensor substrate: Diamond or AlGaN ROIC: silicon based CMOS structure

  11. Wide band gab material detectors Can be selcted to be solar blind Highly efficient in the VUV and EUV

  12. Focal plane array for space instrumentation

  13. Silicon based sensors vs. Wide band gap sensors

  14. Drawbacks of current solar EUV sensors the EUV-teleskope EIT on SOHO • CCDs need cooling. • complicates thermal design • results in contamination trap • --> Efficiency very unstable .

  15. Instability of channel plate detectors e. g. CDS spectrograph on SOHO: The gain of channel plates reduces constantly during usage.

More Related