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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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  • DOI:
    _unreg_wc-2003.TC14-026

Event details:

  • IMEKO TC:
  • Event name:
    XVII IMEKO World Congress
  • Title:

    Metrology in the 3rd Millennium

  • Place:
    Dubrovnik, CROATIA
  • Time:
    22 June 2003 - 28 June 2003