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.

Author: Vollesen, Jens Henrik
Affiliation: Cand. Scient. Bang & Olufsen A/S, Struer, Denmark
AES Convention: 88 (March 1990) Paper Number: 2890
Publication Date: March 1, 1990
Subject: Systems and Measurements

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