A2.3 - Online Bearing Lubricant Sensing by Mode Conversi¬on of Surface Acoustic Waves

G. Lindner, Ch. Brückner & M. Schmitt
A novel approach to online condition monitoring of the lubricant status in bearings is introduced, which is based on the mode conversion effect of surface acoustic waves: The excitation of Lamb waves on an outer surface of a bearing by attached piezoelectric interdigital transducers results in an interaction of these Lamb waves with the lubricant at the inner surface. This interaction influences the transmission of the Lamb waves to a second transducer due to the...