Musical instrument recordings made with a fiber Fabry-Perot cavity: photonic guitar pickup.
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 microm displacement) and audio frequency (DC to 20 kHz) and good linearity up to a displacement of 225 microm. The audio noise is found to arise from the fiber-optic cables and, to a lesser extent, from the laser and laser driver.
Ballard
Nicholas
N
Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
Paz-Soldan
Daniel
D
Kung
Peter
P
Loock
Hans-Peter
HP