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Roughness Measurement Parameters by the Eddy Current Technique

Roughness parameters are important characteristics in the manufacturing and friction of materials. Variations in the roughness parameters during motion can be used to estimate the longevity of rubbed surfaces. In the Theoretical Background section of this paper, the feasibility of using the eddy current technique for measuring the roughness parameters of nonferrous and ferrous metals, and specifically steel surfaces, is demonstrated. Eddy current tests were performed using a commercial manual flaw detector with pencil probes. In the Experimental Procedure sections, the roughness parameters of ferrous and nonferrous metals were evaluated in static conditions using eddy current technique measurements. Eddy current technique data were compared with the values of the roughness parameters measured by a profilograph. Good correlation was obtained between the eddy current technique and profilograph measurements. Finally, the roughness parameters were evaluated under dynamic conditions during friction tests. The results confirmed the applicability of the eddy current technique for measuring the roughness parameters both under static and dynamic conditions. The new methodology and a probe holder design for estimation of roughness parameters in static and dynamic conditions were developed. This methodology excludes the noise factors in the roughness measurement parameters.

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