Abstract

<p>An expression involving the fringe brightness as a function of the amplitude of vibration is obtained for the case of a Michelson or a similar interferometer in which one of the returning mirrors executes S.H.M. in a direction perpendicular to its plane. A detailed discussion of the application of this expression to the measurement of the amplitude of vibration of a quartz plate is given, together with the observations upon four such plates. The superposition of either the first or second overtone upon the fundamental is also considered.</p><p>The observed vibrations are predominantly flexural. The experimental results of Doerffler relating to the frequency dependence of the velocity of flexural waves are confirmed and found to apply to X-waves in a Y-cut. There is evidence of low frequency flexural waves propagated diagonally across a quartz plate.</p><p>An interferometer method is suggested for distinguishing between flexural and longitudinal vibrations.</p>

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