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1February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Georg Gassner Robert Ruland, SLAC
February, 2008
Georg Gassner Robert Ruland, SLAC
February, 2008
Introduction Rotary Table Calibration Laser Tracker Investigation ADM Tests Conclusion
Introduction Rotary Table Calibration Laser Tracker Investigation ADM Tests Conclusion
Laser Tracker Test Facility at SLACLaser Tracker Test Facility at SLAC
2February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Introduction
Particle Physics experiments at SLAC require high accuracy positioning, e. g. 100 µm over a distance of 140 m or 25 µm in a 7 x 10 x 3 meter room
Realization -> Laser Tracker Measurements
Rotary calibration table (Kugler GmbH) providing an accuracy of better than 0.2 arcsec
Interferometer bench
3February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Rotary Table
Renishaw Signum RESM angle encoder system 1 arcsec graduation accuracy
0.01 arcsec resolution
4February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Calibration of the rotary table (1)
Rosette technique calibrate precision polygon prismssum of the angles measured must result in 360 degrees Moeller-Wedel electronic autocollimator (0.1arcsec accuracy, 0.05arcsec reproducibility)
5February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Calibration of the rotary table (2)
Derived Technique set the fixture with the mirrors in a way that mirror ‘a’ is in line with autocollimator ‘a’
rotate the table together with the fixture until mirror ‘b’ is in line with autocollimator ‘b’
6February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Calibration of the rotary table (3)
Absolute value of an angle between two positions of the rotary table can be determined with ±0.2 arcsec std.
7February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Laser Tracker Horizontal Angle Measurement System Investigation
Test Setupmirror as a target for laser tracker
parallelism of the two rotation axes
axial displacement of the rotation axes
Rotary table
Faro Laser Tracker
Mirror
8February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Comparison SMR vs. SMM
Test of Mirror (SMM) and Retroreflector (SMR)
Only small deviations can be found
9February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Calibration Results
Two calibration runs with
Faro Laser Tracker Xi
Two calibration runs with
Faro Laser Tracker Xi V2
10February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
ADM Calibration on Interferometer Bench
Calibration of the scale factor of the ADM in the field.
Tests of the general performance and tests to detect malfunctions in the laboratory.
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Laser Tracker
Carriage Interferometerd
Horizontal Bench
11February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Calibration Results
Calibration run with
Faro Laser Tracker Xi
Calibration runs with
Faro Laser Tracker Xi V2
12February, 2008IWAA08
G. Gassner, R. [email protected]@slac.stanford.edu
Conclusion
Rotary table - absolute angle accuracy < 0.2 arcsec
Rotary table to test any horizontal angle measurement instrument
Faro laser trackers angle measurement system deviations stable and correctible
With corrections, angle accuracies of 1 arcsec are possible.
Test of the ADM showed its usability as a replacement for the interferometer mode
