Time-resolved oblique incidence interferometer for vibration analysis of rough surface

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This paper describes a motion-visualization technique for a sample with rough surface by using a stroboscopic oblique-incidence interferometer. To observe a vibrated rough surface, we focused on an oblique-incidence interferometer. The oblique-incidence interferometer is well suited to analysis the rough surface and a displacement of several micrometers because a scattering at a rough surface is reduced. However, by using a continuous light, a visibility of the fringe pattern at a vibrated surface in the ultrasonic region is not good. Therefore, the oblique-incidence interferometer is not suitable for analysis of the ultrasonic vibration. To overcome the problem, a pulsed light synchronized with a vibrated sample was used as a light source by an acousto-optic modulator. To control timing between a reference signal and an input signal of the light source by using a common oscillator, time-resolved behavior of the stator can be measured. By using the interferometer, we have succeeded to detect a periodically movement of a fringe pattern of the vibrated of the stator.

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