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Measurement of gauge blocks by interferometry: an investigation into the variability in wringing film thickness.

Leach, R K; Hart, A; Jackson, K (1999) Measurement of gauge blocks by interferometry: an investigation into the variability in wringing film thickness. NPL Report. CLM 3

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Abstract

According to the British Standard on gauge block calibration (BS 4311), when measuring the length of a gauge block by optical interferometry it is necessary to wring the gauge to an auxiliary surface or platen. Consequently, the measured length of the gauge block includes any physical length associated with the wringing. It is thus essential that a repeatable winging contact between a gauge block and a platen is achieved during routine gauge block calibration. Due to the use of a finite amount of fluid to aid the wringing process, the length associated with wringing a gauge to a platen is known as the wringing film thickness. This report describes a number of experiments designed to quantify the variability in the wringing film thickness. No attempt has been made to determine the absolute wringing film thickness, only its variability when wringing is repeated.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CLM 3
Subjects: Engineering Measurements
Engineering Measurements > Dimensional
Last Modified: 10 Sep 2018 13:07
URI: http://eprintspublications.npl.co.uk/id/eprint/1078

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