New Method for Determination of Surface Distribution of Elastic Properties by Surface Acoustic Waves.

A new method for measuring of surface distribution of elastic properties is presented. The determination of velocity of surface acoustic waves (SAW) is used for it. The method is based on the new stabilization scheme of Michelson interferometer. It allows to measure the velocity of SAW in region of sample less than the wavelength of SAW and may be used for SAW of the frequency area one or ten MHz. The proposed method was analyzed by means of a numerical modeling method. The one-dimensional space distribution of non homogeneous elastic properties was investigated by this measurement scheme. This method may be used as non contact method under condition of using laser excitation of SAW