A new method for interrogation of serial arrays of dynamic FBG strain sensors

摘要

We report a new concept for interrogating and multiplexing large numbers of fibre Bragg grating sensors for dynamic measurands. The series combination of an AOTF and a frequency-modulated MZI forms the basis of a system, which allows simultaneous interrogation of eight sensors, and near-simultaneous interrogation of 64. A minimum strain resolution of 2.23 nε Hz{sup}(-1/2) at a frequency of 10 kHz was achieved.