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Image Intensifiers in Astronomy

Image Intensifiers in Astronomy. Stanislav Ví tek, Karel Fliegel, Petr P áta, Pavel Koten. Outline of the talk. Motivation of our work Description of MAIA system Image intensifier: good for any science? Movie  Experiences, conclusions. Motivation of our work.

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Image Intensifiers in Astronomy

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  1. Image Intensifiers in Astronomy Stanislav Vítek, Karel Fliegel, Petr Páta, Pavel Koten

  2. Outline of the talk • Motivation of our work • Description of MAIA system • Image intensifier: good for any science? • Movie  • Experiences, conclusions

  3. Motivation of our work • Observations of faint meteor showers • Requirements for equipment • Fast enough • High gain • Affordable • Requirements for technical properties are critical • Budget → limited • Human resources → better (students)

  4. History • S-VHS camcorder • 25 fps • Records on tapes • Jitter • No cover

  5. Description of camera • Mechanical componets • (A) Outer cover • Videotec HEG47K2A000 • Heatingwith thermostat • Internal dimensions134x88x450mm • (B) Inner cover • Model Brůna I • Parts milled fromsolid aluminium • Preciseadjustof all components

  6. Description of camera • (2) Key electro-opticalcomponents • (A) Outer lens • Pentax SMC FA 1.4/50mm(K-Mount bayonet) • (B) Image intensifier • Philips (Photonis) XX1332 • Aperture50/40mm • Gain up to60000 lm/lm • Resolution30lp/mm • (C) Inner lens • Pentax H1214-M 1.4/12mm • Extension250μm • C-Mount • (D) Camera • JAI CM-040GE • GigE Vision interface (8/10bpp), 1/2” progressivemono CCD • Resolution776 x 582pix (0,45Mpix) ~PAL • Framerate61,15fps Black anodized inner cover

  7. Overall description • 2 stations (Kunžak a Odřejov) • ~ 210Mbps (8bpp @ 60fps, custom video format) • ~ 1TB / night • video sequences ~ 10 min • central DB, batch data processing

  8. Image intensifier • Philips (Photonis) XX1332 • Image intensifier for night vision • Microchannel plate

  9. Electro-optical properties • Spectral sensitivity • ~455-845nm • Non-linear! • Automatic gain control Overall spectral sensitivity AGC

  10. Electro-optical properties • Spectral response of camera • ~400-725nm • Spectrum on the output aperture of image intensifier • ~487-571nm Spectral sensitivity of camera Spectrum on the output of II

  11. Electro-optical properties • Overall resolution • Limited by used camera (0,24Mpix in circular aperture) Output aperture of image intensifier JAI CM-040GE Nikon D700

  12. Experiences, Conclusions • Unprotected input aperture →  • Automatic iris should be designed • New system • much better characteristics • Not working continuously

  13. Thank for your attention 

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