Abstract
Operational load monitoring and impact damage detection are the two
critical aspects of aerospace structural health monitoring (SHM). Fiber Bragg
grating (FBG) sensors have demonstrated great potential in both. But the currently
available interrogation systems can only handle one of the two types of SHM
capabilities offered by FBG sensors. In addition, the practical implementation
of FBG sensor systems in aerospace vehicles requires the interrogator to be
small size, light weight, and low-power consuming. In this paper, we present
an Echelle diffractive grating (EDG) based interrogation system for FBG sensors,
which possesses two operation modes, i.e., the sweeping mode for operational
load monitoring and the parked mode for impact damage detection. Experimental
results show that this interrogator offers better than 1-pm measurement resolution
and 10-pm repeatability. In addition, the interrogation system is very compact
and weighs less than 60 g (excluding the electronic controller). It also has
the potential to achieve a measurement speed of 300 kHz and be powered by
a battery.
© 2013 Crown
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