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Measurement of toothpaste abrasion

Anders Liljeborg Gunnar Johannsen. Measurement of toothpaste abrasion. Earlier measurements. Photo diode. HeNe laser. Plexi-sample. Voltmeter. Surface profilometer, KLA-Tencor P15. Diamond stylus, 2 micron radius. Vertical resolution a few nanometers. 117 mm. 25 mm. Blank profile.

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Measurement of toothpaste abrasion

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  1. Anders Liljeborg Gunnar Johannsen Measurement of toothpaste abrasion

  2. Earlier measurements Photo diode HeNe laser Plexi-sample Voltmeter

  3. Surface profilometer, KLA-Tencor P15 Diamond stylus, 2 micron radius Vertical resolution a few nanometers

  4. 117 mm 25 mm Blank profile 20 mm 20 mm

  5. Center profile, 2000 points

  6. Center, +20mm and -20mm profiles

  7. Nonflat plexi surface

  8. Compensated by fit of 3:rd order polynomial to 50 first and last points

  9. Comparison with “blank” profile at lower end of plexi sample, note bad fit to the left, good fit to the right.

  10. RA (Roughness Average) = mean deviation from mean depth value RA = sum ( abs( mean – y ) ) / length RA and mean depth computed for center 20% of profile

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