Fresnel diffraction for fast and accurate in-process measurement of the diameters of rotational symmetric workpieces

Burkhard Huhnke

doi:10.1117/12.287756

25 September 1997 Fresnel diffraction for fast and accurate in-process measurement of the diameters of rotational symmetric workpieces

Burkhard Huhnke

Author Affiliations +

Proceedings Volume 3100, Sensors, Sensor Systems, and Sensor Data Processing; (1997) https://doi.org/10.1117/12.287756
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

The paper presents an innovative instrumentation for in- process measurements of the actual diameters of workpieces with rotational symmetry. This instrumentation may readily be integrated into turning or grinding machine, e.g. for the ends of quality assurance and to make an automatic compensation of deviations of diameters possible. It consists of two optical Fresnel diffraction sensors mounted diametrically to the nominal axis of the workpieces under process such allowing a fast measurement of their actual diameters with errors less than +/- 5 micrometers at scanning rates of more than 1 kHz. An automatic follow-up system, based on grated glass scales has been constructed to achieve the requirements of a resolution of 1 micrometers up to diameters of 300 mm. Special high precision guide rails and bearings have been constructed to minimize the effects of imperfect guiding to the over-all accuracy. Variations of the ambient temperature doesn't effect the results since the complete instrumentation is in a housing at stable temperature. High pressure jets make sure that the workpiece surface in the measurement areas are blown free from oil, cooling fluids, and chips.

Citation Download Citation

Burkhard Huhnke "Fresnel diffraction for fast and accurate in-process measurement of the diameters of rotational symmetric workpieces", Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); https://doi.org/10.1117/12.287756

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