Some practical aspects of long gauge block calibration

Alessandro Balsamo; Marco Zangirolami

doi:10.1117/12.323115

30 September 1998 Some practical aspects of long gauge block calibration

Alessandro Balsamo, Marco Zangirolami

Proceedings Volume 3477, Recent Developments in Optical Gauge Block Metrology; (1998) https://doi.org/10.1117/12.323115
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

This paper deals with some practical aspects of the calibration of long gauge blocks. Particular attention is given to the thermal aspects of the calibration, including the in situ calibration of the thermometers according to the ITS-90, the procedure which frees from the need of external traceability to electrical SI units, the optimal disposition of the thermometers on the gauge block, and the clamping technique which prevents distortion of the gauge and minimizes the probability of mechanical shocks to the thermometers. Experimental data are reported which shows a sub-millikelvin uniformity of the gauge block. The stress- free gauge block supports are also descried, optimized to compensate for the bending due to the weight of the platen wrung to the block end, to allow accurate face parallelism measurements. The procedures for measuring the deviation from planarity and the variation of length are described, which implement the ISO 3650 definitions with no approximate image processing of the interferograms.

Citation Download Citation

Alessandro Balsamo and Marco Zangirolami "Some practical aspects of long gauge block calibration", Proc. SPIE 3477, Recent Developments in Optical Gauge Block Metrology, (30 September 1998); https://doi.org/10.1117/12.323115

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