Calibration of total stations instruments at the ESRF
Martin, David and Gilles Gatta
The European Synchrotron Radiation Facility (ESRF) is an accelerator laboratory located in Grenoble, France which produces high quality X-rays for use by scientists from Europe and around the world. For the ESRF accelerators and beamlines to function correctly, alignment is of critical importance. The ESRF ALignment and GEodesy (ALGE) group is responsible for the installation, control and periodic realignment of the accelerators and experiments. Alignment tolerances are typically less than one millimetre and often in the order of several micrometers over the ESRF storage ring circumference. To help respect these tolerances, the ESRF has developed a 50m-long calibration bench. Since February 2001, this bench has been accredited by COFRAC under the ISO/CEI 17025 standard for the calibration of electromagnetic distancemeters (EDM). This work has recently been extended to the calibration of laser tracker Absolute Distancemeters (ADMMs). Considerable effort has also been made to qualify the angle measuring capacity of Robotic Total Stations (RTS) and laser trackers; in particular the angle dependence on distance and the calibration of the angle readings with respect to a very high precision standard. This paper will present and review these activities.
Event: XXIII International FIG Congress : Shaping the change
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