Calibration of 8 Gauge Blocks by Interferometry.

Final Report, 5 Oct 2004



The main purpose of this cooperation was to aid the development of a software package for thecalculation of gauge block size using the NPL / Hilger-Watts Interferometer which was being developed by NML. During a visit by Sean Peyton from the NML-Enterprise Ireland to Gum- Poland, the calibration by interferometry of a number of gauge blocks was carried out and the measured values obtained were compared to measurements made on the NML interferometer on their return to Ireland.

Calibration using a Kösters (GUM) and Hilger & Watts (NML) interferometers were discussed at length, including the possible sources of error, from which an uncertainty budget could be determined.

Exchange of material information on gauge block calibration and software development.







GUM to demonstrate the calibration of 8 gauge blocks 0.5, 1.0, 2.0, 10.0, 25.0, 50.0, 75.0, 100.0 mm to Enterprise Ireland staff. On return to Ireland, the gauge blocks will be recalibrated in Enterprise Ireland and an evaluation of the results carried out.

Exchange of experience on procedures and methodology in the interfermetric calibration of ‘gauge blocks’.

Exchange of technical information on ‘gauge block’ calibration software.

Errors in gauge block calibration and uncertainty.


Length (L)
Howard McQuoid, NSAI NML (Ireland)
Phone: +353 1 808 2609
Fax: +353 1 808 2026
Coordinating Institute
NSAI NML (Ireland)
Participating Partners
GUM (Poland)