Patent ID: 6696697
Filing Date: 2004-02-24
Classification: G01B

Abstract:
A roughness measuring method, comprising the steps of:specifying a measurement area of surface roughness of a work; measuring a total range of the specified measurement area to obtain measurement data showing the surface roughness of the work; using a filter having a plurality of predefined cutoff values to calculate, from the measurement data, a plurality of temporary evaluation values for an evaluation length corresponding to a first one of the plurality of predefined cutoff values, thereby obtaining a maximum value of the plurality of temporary evaluation values; obtaining the maximum value as an effective evaluation value if the maximum value falls within a roughness range of a first one of the plurality of predefined cutoff values; and using a second one of the plurality of predefined cutoff values to obtain an effective evaluation value if the maximum value does not fall within the roughness range of the first one of the plurality of predefined cutoff values.