As parts become smaller and more precise, demand for non-contact surface texture measurement methods increases. In addition to the profile method, there is an increasing demand for areal surface texture evaluation. Various non-contact measurement methods have been standardized as the areal surface measurement method. Above all, point autofocus profiling, a non-contact measurement method standardized in ISO documents, has a high data correlation with the contact stylus type and offers non-contact areal surface texture measurement with high accuracy. It is also capable of measuring surface texture with an inclined surface, evaluating the roughness of the inner diameter and side of the inner diameter, which none of the existing measurement methods have achieved yet. In this paper, we explain the principle and features of this measurement method and introduce effective measurement examples.
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