Abstract
With the aim of measuring local friction between slidng surfaces, obresvation was carried out in a solid contact state using an ultrasonic pulse reflection method. The reflection of ultrasonic waves at the contact boundary surface was dependent on the solid contact area, similarly to friction. Thus actual friction forces and the friction estimated from the height of the reflected echoes were consistent with each other. By comparing the fluctuation of local echoes measured using a focused probe with the measured value of friction which is the sum of the local friction forces, the estimation of local friction was realized, and using these results a distribution map of friction on a sliding surface was drawn.
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