Abstract
Electronic speckle pattern interferometry (ESPI) is an effective optical method for visualizing operational deflection shapes of vibrating objects. The time-averaged ESPI method is used to show how an object vibrates when driven sinusoidally. We describe the construction of our system, which we built using standard optical components. Such a system is appropriate for both research and educational purposes. We will discuss the lessons learned by constructing several ESPI systems.
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