Ball diameter measuring instrument in a gauge block interferometer

Gerard J. Kotte; Han Haitjema

doi:10.1117/12.323097

30 September 1998 Ball diameter measuring instrument in a gauge block interferometer

Gerard J. Kotte, Han Haitjema

Proceedings Volume 3477, Recent Developments in Optical Gauge Block Metrology; (1998) https://doi.org/10.1117/12.323097
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

An instrument for the measurement of ball diameters in the 0.5-20 mm range in a gauge block interferometer is realized. The measurement principle is that the ball is positioned between an optical flat and a calibrated gauge block. The total length is measured in a gauge block relative to the optical flat and proper measurement of the deformations due to the measuring force. The parallelism is adjusted while viewing the interference patterns on the gauge block and the optical flat. The measuring force can be varied in the 0.03- 2.35 N range. The applied force is calibrated. Experiments show that commonly used formulas to calculate the ball indentation as a function of the applied force are approximately correct; this instrument however provides a direct means to measure this dependence and to apply a proper extrapolation to zero measuring force. The design is rather compact so it will fit in commonly used gauge block interferometers. The uncertainty which can be achieved is less than 0.1 micrometer.

Citation Download Citation

Gerard J. Kotte and Han Haitjema "Ball diameter measuring instrument in a gauge block interferometer", Proc. SPIE 3477, Recent Developments in Optical Gauge Block Metrology, (30 September 1998); https://doi.org/10.1117/12.323097

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