Abstract
We present experimental measurements of the resonances of guitar top plates using a speckle pattern interferometer. The studies include sanded spruce starting materials of different grades and finished commercial guitars. The spruce top plates consist of three different wood grades reflecting the quality of the wood grain. The normal mode frequencies and patterns are measured without sides to be consistent with the tap tones a Luthier would use to determine the quality of the top plate. We will discuss the ways in which the wood grade changes the frequency and distribution of normal mode frequencies due to variations in the grains of the raw wood. We will also compare these results to measurements on commercial guitar top plates.
Published Version
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