Development of an interferometric dilatometer for gauge blocks

Miguel Viliesid; Hector-Alfonso Castillo; Marcos Mendoza

doi:10.1117/12.445640

22 October 2001 Development of an interferometric dilatometer for gauge blocks

Miguel Viliesid, Hector-Alfonso Castillo, Marcos Mendoza

Proceedings Volume 4401, Recent Developments in Traceable Dimensional Measurements; (2001) https://doi.org/10.1117/12.445640
Event: Lasers in Metrology and Art Conservation, 2001, Munich, Germany

Abstract

In the quest for a better measurement quality, a reduction of the measurement uncertainty must be foreseen. Gauge block calibration by interferometry is an unavoidable link in the traceability chain of most dimensional measurements and it has an impact in the uncertainty budget of all measurements that derive from it. Length-dependent effects of this calibration contribute largely to the combined uncertainty and therefore, its reduction must be expected to improve the combined uncertainty of gauge block calibration by interferometry. The thermal expansivity expressed as a linear thermal expansion coefficient (LTEC) is one of the main sources of uncertainty in the uncertainty budget. The gauge block manufacturer commonly quotes this number with an uncertainty of about one part in 10^-6 degrees C^-1. A reduction of the LTEC uncertainty to one third of the quoted value would provide a decease of at least 25 percent in the combined uncertainty of gauge blocks longer than 50 mm calibrated by interferometry.

Citation Download Citation

Miguel Viliesid, Hector-Alfonso Castillo, and Marcos Mendoza "Development of an interferometric dilatometer for gauge blocks", Proc. SPIE 4401, Recent Developments in Traceable Dimensional Measurements, (22 October 2001); https://doi.org/10.1117/12.445640

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