Abstract
Abstract The performance of passive quadrature demodulated fiber-optic interferometric strain gauges is investigated,which are used for monitoring the strain on the surface of rods and plates made from Carbon fiber compositesunder dynamic load variations and in the presence of strong vibrations during flight tests, Summary A large number of fiber optic interferometric strain gauge concepts have been investigated during recent years (e.g. /11121/31), howeververy little experience exists up to now with respect to their practical applicability. In thispaper we report the results of strain measurements using passive quadrature demodulated fiber-optic Michelson - interferometers surface adhered to CFRP plates and rods. Strain monitoring during quasistatic compression of aCFRP-rod in a load frame as well as in-flight optical strain measurements on a CFRP-plate, fixed to the main wing spar of a test aircraft serve for characterizing the sensor performance. The incremental fringe counting readout of the optical strain sensor (OSG) is compared to the strain indicated by a conventional resistive straingauge (ESG).
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