ISO 25178 Areal Surface Texture Parameters for Optical Inspection
ISO 25178 defines 3D areal surface parameters like Sa and Sdr, replacing 2D profiles to qualify optical non-contact inspection on textured tool steel and mouldings.
ISO 25178-600
Meaning
Instrument classification standards define metrological characteristics and calibration requirements for non-contact 3D surface measurement systems. For optical profiling of molded optics, ISO 25178-600 categorizes areal surface measurement technologies including confocal microscopy and coherence scanning interferometry. The standard stops applying once metrological performance terms move from physical hardware capabilities to software parameter extraction.
Technology Classification
Modern surface inspection relies on diverse physical principles to capture 3D topography data. Within this framework, ISO 25178-600 defines core metrological terms such as lateral resolution and optical slope limit for each instrument class. Understanding these hardware limits prevents selecting an optical profiler incapable of measuring steep sidewalls on micro-fluidic injection molds.
Instrument vendors must report working distance and measurement field of view using these standardized definitions. Uniform taxonomy simplifies equipment selection for quality control laboratories.
Calibration Framework
Verification procedures quantify instrument response factors using optical physical standards. Guidelines in ISO 25178-600 establish metrological traceability routes for optical profilers measuring polymer surfaces.
Instrument Boundary
Specifying compliance with this standard ensures that optical measurement systems meet minimum performance thresholds for spatial resolution. Adherence to ISO 25178-600 allows plastics moulders to compare surface data collected from different optical instruments reliably. Technical procurement specifications require vendors to certify instrument parameters against this standard.
Calibration certificates reference these definitions to validate annual tool inspections.