Optical Profilometry Replica Metrology Protocol for Mould Cavity Topography
Indirect optical profilometry on elastomeric cavity replicas yields sub-micron texture data while eliminating tool teardown and optical access limits.
Phase Correct Filter
Meaning
A digital filtering algorithm processes surface profile data without introducing artificial spatial phase shifts into the filtered waveform output. Surface metrology systems utilize a phase correct filter compliant with ISO 16610 to ensure spatial features align perfectly with original physical measurements. Legacy analog filters shifted profile peaks horizontally, distorting feature positions relative to structural part boundaries.
Modern surface assessment of plastic sealing faces demands precise spatial alignment to evaluate micro-sealing land geometry accurately.
Waveform Alignment
Zero-phase filtering techniques apply symmetric Gaussian weighting functions in both forward and reverse directions along the data array. Applying a phase correct filter preserves the exact horizontal positions of surface peaks and valleys relative to mean line references. This spatial accuracy enables toolmakers to map specific grinding mark locations directly back to CNC machining coordinates.
Edge Preservation
Step transitions and sharp micro-features produce ringing artifacts when passed through conventional asymmetric filters. Utilizing a phase correct filter eliminates spatial distortion around sharp mold parting lines and textured grain boundaries.
Feature Fidelity
Accurate alignment between roughness and waviness components allows engineers to isolate true tool chatter from material flow marks. Correct phase correct filter selection ensures reliable surface evaluation across complex polymer part geometries.