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MooSci: A Lunar Scintillometer

Michael Allen. MooSci: A Lunar Scintillometer. MooSci. MooSci is a device that uses scintillation measurements from the Moon to reconstruct the ground layer turbulence profile.

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MooSci: A Lunar Scintillometer

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  1. Michael Allen MooSci: A Lunar Scintillometer

  2. MooSci • MooSci is a device that uses scintillation measurements from the Moon to reconstruct the ground layer turbulence profile. • This information about the turbulence profile is used to help choose optimal sites for the placement of new telescopes.

  3. Scintillation • Turbulent packets of air in the atmosphere act like lenses and distort incoming light. • Different sources of light will cause scintillation in different parts of the atmosphere. • Sun • Stars • Planets • Moon

  4. Considerations for using the Moon as a source of scintillation • Scintillation frequency of the Moon • The lunar phase • Adequate signal to noise ratio of >10^4

  5. Mechanical Design • 11 photodiode circuits • Distance between each pair sets heights being profiled

  6. Electronics • Two low pass filters • Voltage regulator and instrumentation amplifier

  7. Data Collection and Reduction • LabView samples all 11 channels at a frequency of 10 kHz. • Python data reduction script to obtain turbulence profile

  8. Results • Current version yet to be complete • Previous versions have worked and been used in site testing for the Giant Magellan Telescope

  9. Questions?

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