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Long Wire Measurement System Georg Gassner, SLAC July, 2007

Long Wire Measurement System Georg Gassner, SLAC July, 2007. Introduction Principle Long Wire. Long Wire Measurement System. Purpose Connecting different parts of a network together (in x - direction). Long Wire Measurement System. Principle

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Long Wire Measurement System Georg Gassner, SLAC July, 2007

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  1. Long Wire Measurement System Georg Gassner, SLACJuly, 2007 • Introduction • Principle • Long Wire 1

  2. Long Wire Measurement System • Purpose • Connecting different parts of a network together (in x - direction) 2

  3. Long Wire Measurement System • Principle • Positioning of a platform relative to a wire at different locations • Connecting the network with the wire -> Laser tracker • Realization • Positioning capabilities • x- y translation -> one laser position in x and y each • Pitch, roll and yaw -> second laser position in x and y each plus bubble level for roll 3

  4. Scan of Wire Along the X- Axis Scan of a 0.4mm diameter green monofilament wire (blackened) • Problem found here: ambient light influences reading -> measurements on Both sides of the wire 4

  5. Scan of Wire Along the X- Axis Scan of a 0.8 mm fishing line (pink) 5

  6. Long Wire Problem with long wire is the exposure of the wire to airflow, this results in vibration of the wire (Experiment in the gallery with a 250m wire resulted in vibrations with an amplitude of > 100 micrometers) -> Solution is to surround the wire with plastic sheets 6

  7. Kink in the wire (1) To determine the existence of kinks in the wire two parallel wires were stretched over a distance of 80 m 7

  8. Kink in the wire (2) To determine the existence of kinks in the wire two parallel wires were stretched over a distance of 80 m. In the ideal case this would result in a straight line. 8

  9. Electro static charge No measurable deflection of the wire by charging the plastic cover Charged Plexiglas rod, 20 mm from line-> 20 micrometers Effect of plastic sheets expected to be 25-100 times smaller Precaution steps: Increasing the humidity -> spraying water on plastic 9

  10. End of Presentation 10

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