Measurement of toothpaste abrasionAnders Liljeborg Gunnar Johannsen
Measurement of toothpaste abrasion
Anders Liljeborg Gunnar Johannsen
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Earlier measurements HeNe laser Plexi-sample Photo diode Voltmeter
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Surface profilometer, KLA-Tencor P15 Diamond stylus, 2 micron radius Vertical resolution a few nanometers
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117 mm 25 mm 20 mm 20 mm Blank profile
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Center profile, 2000 points
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Center, +20mm and -20mm profiles
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Nonflat plexi surface
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Compensated by fit of 3:rd order polynomial to 50 first and last points
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Comparison with "blank" profile at lower end of plexi sample, note bad fit to the left, good fit to the right.
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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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