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Updated: Jun 20, 2026

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
Published on: September 28, 2015
Optical precision profilometer using the differential method
Abstract:
A novel optical precision profilometer, which is nearly independent of vertical vibrations, is proposed. It can make simultaneous height measurements of both a measurement position and its surroundings and perform subsequent digital subtraction of the latter from the former. The noise level of this profilometer on the table with steady vibrations of 0.4 gal (1 gal = 10 (-2) m/sec(2)) is 0.05 nm root mean square. Data obtained from measurements of an optical flat and a Si wafer are included.
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