ABSOLUTE CALIBRATION OF QUARTZ BARS OF VÄISÄLÄ INTERFEROMETER BY WHITE LIGHT GAUGE BLOCK INTERFEROMETER

Antti Lassila, Jorma Jokela, Markku Poutanen, Xu Jie

Abstract

Measurement of a baseline with Väisälä interferometer is a traditional high accuracy length measurement in geodesy. An accurate length up to 1 km is achievable by interferometrically multiplying the length of a 1 m quartz bar. Therefore, the absolute length of the bar should be known with small uncertainty. A measurement setup and procedure for calibration of length of a quartz bar by combined white and laser light gauge block interferometer has been developed. The calibration procedure, results and uncertainty evaluation are presented. A standard uncertainty of 35 nm has been achieved.

Keywords

quartz bar, Väisälä interferometer, geodetic baseline

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PWC-2003-TC14-026.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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