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Investigating chime bar vibrations using high-speed stereophotogrammetry

Grothe, Timo and Barth, Rainer 

Stereophotogrammetry is an optical distance measurement method. Using digital image correlation, the 3D coordinates of control points on a surface are calculated from a stereocamera recording. The use of highspeed cameras allows to obtain time resolved displacement data suitable for structural vibration analysis. The technique appears to be attractive to study musical instruments under realistic performance conditions: The measurement is non-invasive and both rigid-body motion as well as acoustically relevant vibrations are obtained from one video sequence. However, the spatial resolution is far less compared to interferometric measurement methods, and depends strongly on the specific measurement setup, namely, the size of the measurement window, the distance from the measurement object, and the lighting situation. This contribution presents a feasability study on a Double Bass Chime Bar in A (f_0 = 110 Hz) and discusses potential fields of use of the method in musical acoustics research.