Meaning
Non-contact metrology instruments compare physical surface topographies against theoretical digital CAD models using light interference or structured light projection. Quality control laboratories employ optical 3d profilometry to map surface roughness and micro-defects on plastic parts and moulding tools without mechanical contact. High-resolution optical heads capture millions of spatial coordinates to render three-dimensional height maps.
This measurement technique quantifies surface texture features that govern optical clarity and friction characteristics in polymer components. Measuring soft or elastomeric materials proceeds without surface deformation because no physical stylus touches the sample. Non-destructive inspection enables rapid quality verification of textured mold surfaces before production release.
Surface Quantification
White light interferometry and confocal microscopy capture sub-nanometre height variations across complex geometric surfaces. Applying optical 3d profilometry yields areal roughness parameters such as Sa and Sq, offering superior surface characterization compared to legacy single-line profilometer traces. Digital elevation models reveal localized pit depth and micro-scratch profiles across molded lenses.
Detailed surface topography maps assist material engineers in evaluating wear rates from abrasive fillers.
Tool Evaluation
Cavity finish inspection identifies localized EDM erosion damage or micro-pitting before chrome plating. Comparing pre-production and post-run scans using optical 3d profilometry detects early mold wear caused by glass-filled resins.
Light Limitation
Highly transparent polymers and specular metal reflections distort optical returns, requiring specialized polarization filters when performing optical 3d profilometry. Steep sidewall angles exceed optical acceptance limits, resulting in missing elevation data.
