Abstract
Electronic speckle pattern interferometry has turned out to be a method for steady state analysis of vibrating surfaces, which is easy to use and does not require an expensive setup. A new generation of digital high-speed cameras has now become available, which is significantly cheaper, faster, and more sensitive than prior generations, awakening the desire to study transient behavior interferometrically. Although it seems quite straightforward to do a quasi-static ESPI deformation analysis at frame rates of 10–30 fps, it is, in fact, not. From four different types of state of the art digital high-speed cams, all of them with datasheet specifications which should have made them well suited for the intended purpose, only one was able to produce recordings with satisfactory interferences. Recordings of all tested cameras will be presented and possible explanations for the interference problem will be discussed. A successful application of time-resolved ESPI to a plugged or struck musical instrument will also be demonstrated.
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