A DFB fiber laser sensor system using a NI-Compact-RIO-based PGC demodulation scheme

Abstract

An eight-channel distributed feedback fiber laser (DFB FL) sensor system using phase generated carrier (PGC) demodulation scheme is described in this paper. This system employs an unbalanced Michelson interferometer to convert the measurands-induced laser wavelength shifts into the phase shifts. The digital PGC algorithm is realized on the Field Programmable Gate Array (FPGA) module of the commercialized NI-Compact RIO. The influence of the time delay between the interferometric signal and the PGC carrier is then investigated. Finally, the experimental system is setup to validate the analysis above.