AVS 51st International Symposium
    Advanced Surface Engineering Tuesday Sessions
       Session SE-TuP

Paper SE-TuP9
Nanomechanical Testing Using Noncontact Acoustic Technique

Tuesday, November 16, 2004, 4:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: O.G. Lysenko, Institute for Superhard Materials, Ukraine
Authors: O.G. Lysenko, Institute for Superhard Materials, Ukraine
N.V. Novikov, Institute for Superhard Materials, Ukraine
V. Grushko, Institute for Superhard Materials, Ukraine
Correspondent: Click to Email
The new techniques for noncontact measurements of acoustic waves and vibration parameters, such as atomic force acoustic microscopy and tunneling accelerometer have been developed the last years. We present the experimental technique that uses noncontact acoustic method to nanoscale surface characterization. A pulse laser is used to generate surface acoustic waves in a sample. Two SPM tips detect phase and amplitude of the acoustic waves. This approach makes it possible to measure acoustic transit time within small areas of a samles. From the velocity of the surface waves the elastic modulus can be culculated. Also it is possibly to identify the onset of plastic flow in the thin films. A theoretical model embracing the most significant features of wave phenomena at nanoscale level is described. Laboratory experiments have displayed results that are in agreement with those obtained from theoretical model.