Abstract

A 1 cm long, low-finesse fiber-optic cavity was used as a transducer for the vibrations of the soundboard of an acoustic guitar and of a violin. The reflected light is detected and then amplified and recorded using conventional audio instrumentation. The fiber-optic pickup is found to have a high response range in both amplitude (up to $100\mathrm{\mu m}$ displacement) and audio frequency (DC to $20\mathrm{kHz}$) and good linearity up to a displacement of $225\mathrm{\mu m}$. The audio noise is found to arise from the fiber-optic cables and, to a lesser extent, from the laser and laser driver.

© 2010 Optical Society of America

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