A MULTIMODE OPTICAL-FIBRE SENSING SYSTEM USING WHITE-LIGHT INTERFEROMETRY AND A TWO-WAVELENGTH SYNTHETIC SOURCE

摘要

A tandem interferometer system linked with a 100 mu m core diameter multimode fibre has been investigated and a signal-processing scheme introduced to suppress the noise in the system, simulated by a reproducible vibration of the fibre. The results show a short-term repeatability (to three standard deviations) of better than 15 nm displacement with the use of an appropriate curve-fitting signal-processing scheme, under conditions where the fibre is subjected to a known noise signal by being constantly subjected to vibration. [References: 8]