In this paper, we experimentally demonstrate the potential of quasi-distributed high temperature sensor based on fiber
Bragg grating (FBG) utilizing high thermal conductive sheath, which can be a cost-effective alternative for conventional
distributed temperature sensors based on Raman, Brillouin, and Rayleigh scattering. A unique Fire Sensing Cable (FSC)
used in this experiment is constructed from a 304 stainless steel sheath with 16 optical fibers imbedded in a conductive
fluid. One of the fibers contains FBGs for temperature sensing. Total of seventy seven FBGs were serially inscribed with
the spacing of six meter over the total length of 468 meter. FSC was heated by various hot zones formed by IR furnace
and nitrogen heat nozzle, as the shifts of FBGs were monitored. Although FBGs were 6 meter apart each other, high
thermal conductivity of the stainless steal sheath made it possible to check temperature change in the region between
gratings. These preliminary results clearly show a high potential of FBGs combined with FSC in applications of quasi-distributed
fire sensing cables and monitoring systems.
We report in this paper on the design and development of a novel
on-line structural health monitoring and fire detection
system based on an array of optical fiber Bragg grating (FBG) sensors and interrogation system installed on a new, precommercial
compact aircraft. A combined total of 17 FBG sensors - strain, temperature and high-temperature - were
installed at critical locations in an around the wings, fuselage and engine compartment of a prototype, Comp Air CA 12
all-composite, ten-passenger personal airplane powered by a 1,650 hp turbine engine. The sensors are interrogated online
and in real time by a swept laser FBG interrogator (Micron Optics sm125-700) mounted on board the plane. Sensors
readings are then combined with the plane's avionics system and displayed on the pilot's aviation control panel. This
system represents the first of its kind in commercial, small frame, airplanes and a first for optical fiber sensors.
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