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Georg Gassner Robert Ruland, SLAC February, 2008. Laser Tracker Test Facility at SLAC. Introduction Rotary Table Calibration Laser Tracker Investigation ADM Tests Conclusion. Introduction.

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Georg gassner robert ruland slac february 2008 l.jpg
Georg Gassner Robert Ruland, SLACFebruary, 2008

Laser Tracker Test Facility at SLAC

  • Introduction

  • Rotary Table Calibration

  • Laser Tracker Investigation

  • ADM Tests

  • Conclusion

1


Introduction l.jpg
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

2


Rotary table l.jpg
Rotary Table

  • Renishaw Signum RESM angle encoder system

    • 1 arcsec graduation accuracy

    • 0.01 arcsec resolution

3


Calibration of the rotary table 1 l.jpg
Calibration of the rotary table (1)

  • Rosette technique

    • calibrate precision polygon prisms

    • sum of the angles measured must result in 360 degrees

    • Moeller-Wedel electronic autocollimator (0.1arcsec accuracy, 0.05arcsec reproducibility)

4


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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’

5


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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.

6


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Laser Tracker Horizontal Angle Measurement System Investigation

  • Test Setup

    • mirror as a target for laser tracker

    • parallelism of the two rotation axes

    • axial displacement of the rotation axes

Mirror

Faro Laser Tracker

Rotary table

7


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Comparison SMR vs. SMM Investigation

  • Test of Mirror (SMM) and Retroreflector (SMR)

    • Only small deviations can be found

8


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Calibration Results Investigation

Two calibration runs with

Faro Laser Tracker Xi

Two calibration runs with

Faro Laser Tracker Xi V2

9


Adm calibration on interferometer bench l.jpg

Carriage Investigation

Interferometer

Dd

Horizontal Bench

Laser Tracker

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.

10


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Calibration Results Investigation

Calibration run with

Faro Laser Tracker Xi

Calibration runs with

Faro Laser Tracker Xi V2

11


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Conclusion Investigation

  • 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

12


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End of Presentation Investigation

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