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Proceedings Paper

Interferometric calibration of an integrating sphere for determination of the roughness correction of gauge blocks
Author(s): Gerhard Boensch
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Paper Abstract

Determination of the roughness correction with a scattering light method is preformed at PTB since more than forty years for measurements of gauge blocks by interferometry. Setting up of a new integrating sphere initiated investigations on calibration methods. The coupled interferometer method and the Newton's ring method are described and compared. For the coupled interferometer method, the gauge blocks are wrung to an optical flat and the phase of reflection for the gauge- flat interface is determined in a Twyman-Green interferometer. Satisfactory agreement is obtained for the result with both methods.

Paper Details

Date Published: 30 September 1998
PDF: 9 pages
Proc. SPIE 3477, Recent Developments in Optical Gauge Block Metrology, (30 September 1998); doi: 10.1117/12.323104
Show Author Affiliations
Gerhard Boensch, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 3477:
Recent Developments in Optical Gauge Block Metrology
Jennifer E. Decker; Nicholas Brown, Editor(s)

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