Surface roughness Rq_eq – Peak

Peak shows the amount of scattered light over the directly reflected light. Negative value= smoother surface. This is directly proportional to the true surface rms value and is noted as Rq_eq equivalent to the Rq (rms) ISO 25178

Rq between 0,010- 0,350 µm can be measured in all directions. Rq given is in worst direction.

Correlation Gaussian vs Rq

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