Vibrational distribution measurement of piezoelectric devices using laser speckle and image processing techniques

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Fast visualization techniques for vibrational distribution in piezoelectric devices are described. The methods are based on the speckle interference on the device surface, and apply a two-dimensional correlation filter to speckle image data for the driven and resting phases of the devices. In spite of having a short measurement time, these methods produce very clear high-contrast vibrational-distribution images. The experimental results for quartz resonators with rough or polished surfaces demonstrate the applicability of the proposed method.

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