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ACCURATE LINEAR THERMAL EXPANSION COEFFICIENT DETERMINATION BY INTERFEROMETRY

Jarkko Unkuri, Jorma Manninen, Antti Lassila
  • Abstract:
    In precision length measurements the accurate and traceable value of the linear thermal expansion coefficient (LTEC) is needed. A device for interferometric determination of the LTEC of gauge blocks has been constructed. Minimum temperature gradients in a gauge block with 500 mm maximum length and relatively fast operation were the objectives of this project. Based on uncertainty analysis LTEC can be measured with a standard uncertainty of 0,02·10-6 1/K for 100 mm gauge blocks.
  • Keywords:
    thermal expansion coefficient, interferometry, gauge block
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  • DOI:
    _unreg_wc-2003.TC2-018

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