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Superior surface quality control by deflectometry

Superior surface quality control by deflectometry. Common practice. High quality surfaces are often evaluated visually. Coatings Quality. Stamping. Visual Control. Final Inspection. Assembly. Components. Visual Control. Subjective. Time Consuming. Costly. Lacks Traceability.

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Superior surface quality control by deflectometry

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  1. Superior surface quality control by deflectometry

  2. Common practice High quality surfaces are often evaluated visually

  3. Coatings Quality Stamping Visual Control Final Inspection Assembly Components

  4. Visual Control • Subjective • Time Consuming • Costly • Lacks Traceability • Not reliable – Monday morning vs. Friday afternoon! • A real measurement system is required

  5. Replace Subjectivity with Objective Measurement

  6. Maps, measures and quantifies surface appearance quality • Produces detailed full field 3D surface images • Objectively measures surface curvature and texture • Displays images in traceable SI units (m¯1) or in standard industrial scales • Identifies and locates common surface defects • Requires no movement over the surface • Removes errors caused through subjective visual evaluation

  7. MeasurementPrinciple • Phase Stepped Deflectometry. • A white light optical technique • provides fast, full field, non contact surface measurement. • A periodic sinusoidal waveform is projected onto the surface • and the reflected image captured.

  8. MeasurementPrinciple • The pattern acts like a ruler across the surface • allowing the surface ordinates to be mapped. • By phase stepping the pattern across the surface in both directions • each point on the surface is spatially modelled • to accurately calculate the curvature at each point.

  9. Slopes and Curvatures • Why • Consider a surface (green) compared to its normal shape • An observer is unlikely to notice the gradual variation across the whole surface • But will notice the sharp deviation

  10. Slopes and Curvatures • The second derivative of the surface produces a curvature profile which is more representative of what the human eye really sees • Altitude • Slope • Curvature Wavelength

  11. 95 x 70mm Global surface curvature map

  12. The Optimap analyses surface curvature according to its size. Displaying the results in ranges to simulate the resolution of the human eye at various distances.

  13. Identify and quantify common surface defects Blistering Orange Peel

  14. Identify and quantify common surface defects Sagging Inclusions

  15. Identify and quantify common surface defects Water Stain Overspray

  16. Replace Subjectivity with Objective Measurement

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