Measuring or representing of shear vibration or shear wave fields in solid body

摘要

The acoustic shear vibration or shear wave at the conducting surface of the solid body is produced using an operating frequency (f). An auxiliary signal is produced with a frequency (fh = 2f plus or minus DELTA f), which is slightly different from by DELTA f, from the doubled operating frequency (2f). This auxiliary signal is applied at an element of the tunnel passage e.g. the scanning tip (1). The frequency difference (DELTA f) between the auxiliary signal (fh = 2f +/- DELTA f) and the doubled operating frequency (2f) is used for determining of the data regarding the shear vibration or the shear wave fields, contained in the tunnel current with the same frequency.