2-DIMENSIONAL FAST FOURIER-TRANSFORM AND POWER SPECTRUM FOR SURFACE-ROUGHNESS IN 3 DIMENSIONS

Two-dimensional power spectrums of engineering surfaces contain plenty of information that is important and valuable for surface characteriz ation. However, the characteristics of the two-dimensional spectrums a re largely unknown and the algorithm To implement them is not familiar to many engineers or researchers. This paper describes a detailed pro cedure to implement the two-dimensional fast Fourier transform and pow er spectrum for surface roughness in three dimensions. Methods used to extract information from the spectrums are introduced. In order to pe rform two-dimensional spectral analysis and to have a comprehensive un derstanding of the characteristics of engineering surfaces, an atlas o f the two-dimensional spectrums of representative engineering surfaces are presented. The properties of the spectrums are discussed in conju nction with theoretical analysis and visual characterization of the pr esented spectrums.