Musical Instrument Recordings Made With a Fiber Fabry–Perot Cavity: Photonic Guitar Pickup
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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 μm displacement) and audio frequency (DC to 20 kHz ) and good linearity up to a displacement of 225 μm . The audio noise is found to arise from the fiber-optic cables and, to a lesser extent, from the laser and laser driver.