An optical microform calibration system for ball-shaped hardness indenters

Zhi Li; Sai Gao; Konrad Herrmann

doi:10.1117/12.854800

14 May 2010 An optical microform calibration system for ball-shaped hardness indenters

Zhi Li, Sai Gao, Konrad Herrmann

Proceedings Volume 7718, Optical Micro- and Nanometrology III; 77181C (2010) https://doi.org/10.1117/12.854800
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

Accurate measurement of the mechanical properties of materials with micro-/nanoindentation methods demands precise knowledge of tip geometry of the indenters in use. An optical microform calibration system for ball-shaped indenters, and Rockwell indenter in particular, is therefore developed in Physikalisch-Technische Bundesanstalt. The calibration system is fundamentally realized on basis of an optical confocal microscope. By means of investigating the spherical aberration introduced by the object under test, the calibration system has the capability to quantitatively determine the averaging radius of a spherical body (up to 300 μm) with an uncertainty of ~ 6 x 10^-3. To apply the calibration system for characterization of a partial spherical object, e.g. a Rockwell indenter, a simple method has been proposed to improve the possible resolution of the calibration system. The basic configuration of the calibration system and preliminary experimental results are detailed in this paper. Further extension of the functionality of the calibration system is outlined.

Citation Download Citation

Zhi Li, Sai Gao, and Konrad Herrmann "An optical microform calibration system for ball-shaped hardness indenters", Proc. SPIE 7718, Optical Micro- and Nanometrology III, 77181C (14 May 2010); https://doi.org/10.1117/12.854800

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