To investigate strain-sensitive characteristics of fiber Bragg grating (FBG) sensors, a minimaludsensing system consisting of multiplex FBG sensors and signal demodulating and processingudinstruments was constructed. FBG sensors were designed with different package structures forudrespectively sensing strain or temperature parameters, and they returnedudmeasurand-dependent wavelengths back to the interrogation system for measurement withudhigh resolution. In this paper, tests were performed on structure samples with step-wiseudincrease of deformations. Both FBG sensing system and strain gages were tested andudcompared. Experimental work proved that the FBG sensing system had a good level ofudaccuracy in measuring the static response of the tested composite structure. Moreover theudadditional advantages such as damp proofing, high sampling rates and real-time inspectionudmake the novel system especially appropriate for load monitoring and damage detection ofudaerospace structures.
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