Abstract
A description is given of the application of a number of multiple-beam interference methods to the study of the piezoelectric oscillations of some quartz crystals. The distribution of surface nodes and anti-nodes of motion and the amplitudes of oscillation are revealed by simple methods. By employing a stroboscopic illumination technique the phase relations between the various vibrating regions of the crystal suface are revealed. The nodal regions are shown to be at rest to within less than 50 A and the surface deformations are revealed to at least a similar order of accuracy. By a modified technique fringes are obtained through the crystal body and these reveal changes in the optical thickness. One crystal developed sharp surface discontinuities after being set into oscillation, indicating that crystallographic glide or slip had taken place. This is shown to be closely related to the familiar shattering of quartz crystals at excessive amplitudes of oscillation.
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