Method of and an apparatus for determining the surface condition of a workpiece
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United States of America Patent
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Nov 2, 1999
Grant Date -
N/A
app pub date -
Jun 2, 1997
filing date -
Jun 4, 1996
priority date (Note) -
Expired
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Abstract
Apparatus and method of determining the surface condition of a workpiece, operate by measuring a roughness profile of the surface across a certain measuring distance, splitting up the roughness profile into wave frequencies and amplitudes associated with them, dividing the wave frequencies into wave frequency ranges, and determining the surface condition of the workpiece based on the amplitudes in the respective wave frequency ranges. The roughness profile may be understood as the superpositioning of harmonic oscillations having certain wavelengths and amplitudes. By subjecting them to a Fourier analysis, these harmonic oscillations are split up into their wave frequencies and associated amplitudes. Then wave frequency ranges are combined to form bands such that a high intensity in one of the bands each corresponds to a certain physical appearance of the surface. The invention thus provides an objective, calculable measure of the surface condition of a workpiece.
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