EN ISO 16610-61:2015 PDF

Overview

EN ISO 16610-61:2015 - Geometrical product specification (GPS) - Filtration - Part 61: Linear areal filters - Gaussian filters (ISO 16610-61:2015) defines metrological rules for linear areal Gaussian filters used in surface texture analysis. The standard specifies rotationally symmetric Gaussian weighting functions and how to separate a surface into long-wave (form/shape) and short-wave (texture) components for nominal planar and nominal cylindrical surfaces.

Key topics

• Filter type and scope
  • Linear areal Gaussian filters for nominal planar surfaces and nominal cylindrical surfaces.
  • Rotationally symmetric filtration and profile extraction for circumferential lines.
• Weighting function
  • The areal weighting function is a rotationally symmetric Gaussian function defined with a cut-off wavelength (λ, nesting index). A constant parameter is specified so that the filter transmits 50% of amplitude at the cut-off.
  • Separable weighting functions and implications for implementation are addressed.
• Transmission characteristics
  • Defined transmission characteristics for both the long-wave component and the short-wave component - i.e., how different spatial wavelengths are attenuated or passed by the filter.
• Cylindrical filtration
  • Definitions for undulations per revolution (UPR) and the undulation cut-off (nesting index) used when filtering circumferential line extractions from cylindrical surfaces.
• Normative references and context
  • Built on other parts of ISO 16610 (Parts 1, 20, 21, 60) and uses GPS principles (ISO/TR 14638, ISO 8015). Annexes provide examples, concept diagrams and relationships to GPS matrix models.

Applications

• Surface metrology and roughness analysis for quality control in precision manufacturing.
• Filtering of measured areal data from optical profilers, white-light interferometers and tactile areal scanners.
• Use in industries where surface texture affects function: automotive, aerospace, bearings, seals, medical devices, and optics.