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The Goniometers

The Goniometers. Yury Gavrikov 25/03/2009. Looking back. 1 year ago…. I met with two very nice g… oniometers. Because we decided to adapt their for a new experiment. The idea of mechanics Linear movement. Engine DC-servo motor. Gear box Belt drive + “virtual” screw. Carriage

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The Goniometers

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  1. The Goniometers YuryGavrikov 25/03/2009

  2. Looking back

  3. 1 year ago… • I met with two very nice g…oniometers Because we decided to adapt their for a new experiment

  4. The idea of mechanicsLinear movement Engine DC-servo motor Gear box Belt drive + “virtual” screw Carriage slides on the 2 guides

  5. Linear motion (full range = 90mm) Inside of beam Outside of beam

  6. The idea of mechanics Angle • Angular movement Stepper motor & Belt drive Microscrew Pusher 1mm ~63mm Axis Angule ~15mrad

  7. Modernization Unificated solution for angular & linear motion: • Stepper motor for driving • LVDT for position measurement • Common Control system for all devices It was needed the mashining of original parts

  8. Mechanical revision After modernization during last month before installation : - 4 revisions and full disassembling - A lot of motion tests and measurements - Fixing of sources of the problems

  9. Measurement & Calibration

  10. Angle measurement • Digital Autocollimator specially designed for the experiment Range: ~ 8000 mrad (horizontal) ~ 6500 mrad (vertical) Resolution: < 0.5mrad

  11. Angle measurement • The general Idea of angle measurement Mirror

  12. Angle calibration • The Idea of crystal angle calibration Crystal Reference mirror

  13. Angle calibration • Angle vs. LVDT position Goniometer 1 Goniometer 2

  14. Nonlinearity of goniometers Periodical structure corresponds to the motor revolution Nonlinearity : about +/- 50mrad

  15. Stability • Mechanical stability The goniometers are very SENSITIVE to any mechanical disturbance The design is SOFT. “Don’t touch” should be placed everywhere We can move it only in work direction to avoid all gaps

  16. Stability • Stability of LVDT during 14 hours looks quite good (*) Gonio2, LVDT 3-5 mrad (*) with averaging to reduce the noise

  17. Repeatability • Preliminary estimation for angular motion

  18. Alignment system

  19. Crystal align andAngle measurement on the tank Crystal 1 Ref. mirror Crystal 2

  20. Photos of alignment system Viewport Digital autocollimator Laser Pentaprizm Reference mirror

  21. Sources of uncertainty • Initial orientation of the alignment rail to the tank geometry +/- 350mrad • Nonlinearity of goniometers +/- 50 mrad

  22. Conclusions We can use this goniometers with some magic gestures right now BUT To reach better results in the future we have to develop a new goniometer

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