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Measuring Deflection of the Telescope Mount

Measuring Deflection of the Telescope Mount. Arlen Kam Gemini North Observatory Mentor: John White Supervisor: Neal Masuda. Premise. Azimuth. By John White. The telescope mount tilts when it moves. The base is not perfectly circular and flat, so rollers move up and down.

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Measuring Deflection of the Telescope Mount

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  1. Measuring Deflection of the Telescope Mount Arlen Kam Gemini North Observatory Mentor: John White Supervisor: Neal Masuda

  2. Premise Azimuth By John White The telescope mount tilts when it moves The base is not perfectly circular and flat, so rollers move up and down

  3. Base mount may tilt unless telescope bearings are perfectly aligned Premise Elevation By John White The telescope mount tilts when it moves

  4. Bubble Excitation sensors Inclinometer Two Electrolytic sensors, one each for the x-axis and y-axis The bubble causes accelerometer properties Electrolytic Sensor Applied Geomechanics Model 701-2A

  5. Setup Inclinometers Power Supply Computer Data Acquisition module Good for extrapolating lots of data directly into the computer

  6. Data Collection Azimuth axis: between telescope support columns Elevation axis: on elevation platform Rotate clockwise and counter-clockwise, at 1 degree per second and 2 degrees per second, on both sides of the mount base, giving 8 sets of data Rotate downwards, at 0.5 degrees per second, stopping for 5 seconds every 10 degrees, then back up Rotate without stops Set elevation at 45 degrees, rotate azimuth 360 degrees, at 1 degree per second, clockwise and counter-clockwise All on both sides giving 12 sets of data

  7. Results Inclinometer 5159 Y axes X axes Inclinometer 4911 These inclinometers are so precise, they detect the chirping of the cooling system

  8. Results Azimuth Y axes of clockwise rotation at 1 degree per second deflection time -10 80 170 260 350 Azimuth position All the Azimuth data show a 30-40 arcsecond total deflection as the telescope is rotated 360 degrees. 1 arcsecond = 2 kilometers on the Moon

  9. Results Elevation Y axes of clockwise rotation at 1 degree per second with Elevation at 45 degrees deflection time -10 80 170 260 350 Azimuth position With the Elevation set at 45 degrees, there was no major change in the range of deflection when the telescope was rotated about the Azimuth axis This means that the Elevation axis is very stable and well balanced

  10. Results Elevation X axes of downwards rotation at 0.5 degree per second deflection time 90 55 20 Elevation position There was no major overall deflection as the elevation axis was rotated

  11. In the Future… Analyze the deflection in comparison with other variables on the telescope like bearing pressure, wind, and temperature. Send the data, equipment, and setup instructions down to Gemini South so the same readings can be taken there, where they can be used to help align the Multi Conjugate Adaptive Optics (MCAO).

  12. Thank you for helping to make my project a success Mentor: John White Neal Masuda, Chris Yamasaki, Layne Novak, Akamai Internship Program, Center for Adaptive Optics, and the Gemini Observatory and Staff Funding provided through the Center for Adaptive Optics, a National Science Foundation Science and Technology Center (STC), AST-987683

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