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Vibration Measurement with Digital ESPI

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ESPI (Electronic Speckle Pattern Interferometry) is a valuable tool to visualize loudspeaker vibration. Using digital image processing, numerical data can be extracted from the ESPI video signal. A method id proposed to obtain vibration amplitude and phase data. this method avoids fringe counting, and can be automated. The application to sound pressure evaluation is discussed.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=5804

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