Monolithic multicore fiber based multi-parameter measurement based on spatial-division-multiplex sensing mechanisms

A monolithic all-solid multicore fiber based smart sensing system has been proposed and demonstrated in this paper. This technology enables the monitoring of multiple parameters of interest simultaneously, by spatially multiplexing specific sensing mechanisms seamlessly through different cores. The Raman distributed temperature sensor (RDTS), polarization detection based vibration sensor (PVS) and fiber Bragg grating (FBG) sensor are successfully integrated via a 7-core fiber for vibration frequency and discriminated strain and temperature sensing. The experimental results show that the performance of PVS based vibration frequency sensing is unacted on the influence of ambient strain and temperature. In addition, the discriminated strain and temperature measurements have also been experimentally investigated. All the results demonstrated that the proposed scheme of spatially multiplexing FBG with RDTS and PVS can readily achieve simultaneous measurement of vibration and discriminated strain and temperature, which provides a promising way of multi-dimension diagnosis for structural health monitoring.