Transcript MONALISA Compact Straightness Monitor Simulation and

MONALISA
Compact Straightness Monitor
Simulation and Calibration
Week 8 Report
By Patrick Gloster
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MONALISA
Compact Straightness Monitor
Simulation and Calibration
Week 8 Report
By Patrick Gloster
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3D!!!!!!!!!!!!!!!!!!!!
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8 launch heads arrange in a cross
4 retroreflectors on plate 2
3 coordinates define the centre of plate 2
3 angles define the orientation
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Two Stage Program
• Use a set of N plate 2 positions to calculate the
positions of the launch heads on plate 1
• Use these calculated positions to calculate the
positions of any set of plate 2 positions
• Systematic error – depends on how good the
initial calibration was
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How many plate 2 positions do
we need for good calibration?
• Experiment with different numbers of positions
used to calculate the positions of the launch heads
• Find how many we need to get the best accuracy
we can
• 400/500 looks good – 600  error – out of
memory
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Examine the accuracy we can
expect with these calibrations
• Perform 50 different calibrations (using a different
set of N plate 2 positions each time)
• For each calibration, calculate the positions of M
other plate 2 positions
• Find the difference between the true and
calculated values
• Plot histograms of the mean and standard
deviation of these differences over all of the
calibrations
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