Investigating the Impact of Probe Geometry Characteristics on the Ra in the International Metrology Comparison of Surface Roughness

International metrology comparison is instrumental in the establishment of a universal measurement standard and facilitating metrological traceability globally. China, being a major player in industrial manufacturing, plays a crucial role in the global commercial and manufacturing landscape, underscoring the necessity of conducting comprehensive surface roughness international comparison studies. Contact stylus profilometers, widely employed for surface roughness parameter measurement, often exhibit distortions in the measurement outcomes due to the convolution effect created during the probe-surface interface, necessitating consideration of distortions caused by probe geometric characteristics. In this study, we have conducted an in-depth investigation into the mechanism triggered by probe geometric traits inducing changes in the Ra parameter and constructed an algorithm to rectify these measurements, thereby mitigating the influence of probe geometric properties and accurately evaluating the Ra uncertainty triggered by these probe traits. Empirical evidence from this research underscores the efficacy of the devised algorithm in calculating and evaluating the Ra parameter within an international metrology surface roughness metrology comparison context, thereby facilitating effective correction of distorted data.