Parallel multiplexing of fibre optic white light interferometric and fibre Bragg grating sensors for local and global strain measurements

摘要

A scheme, based on the parallel multiplexing of long gauge fibre optic whitelight interferometric (FOWLI) and fibre Bragg grating (FBG) sensors, is proposed to realize quasi-static local and global strain measurements. The demodulation of the sensor system is realized in the spectral domain. A system with two FOWLIs of approx500 mm in gauge length and two FBGs of approx20 mm in gauge length is built and tested. The results demonstrate that the multiplexing scheme is feasible and the low crosstalk system can be used to realize local and global strain measurements at the same time.