In this paper, we present the simultaneous measurement of the strain and temperature
during cures of various composite laminates using fiber optic sensors. Fiber Bragg
grating/extrinsic Fabry-Perot interferometric (FBG/EFPI) hybrid sensors were used to
measure those measurands. The characteristic matrix of the hybrid sensor is derived
analytically and measurements can be done without sensor calibration experiments. For the
fabrication of the three types of graphite/epoxy composite laminate, two FBG/EFPI hybrid
sensors were embedded in each composite laminate in two mutually perpendicular different
directions. We performed the real time measurement of fabrication strains and temperatures at
two points within the composite laminates during cure process in an autoclave. Through these
experiments, FBG/EFPI sensors are proven to be an efficient choice for smart monitoring of
composite structures.