简介：Developmentandtestingofaseriallymultiplexedfiberopticsensorsystemisdescribed.Thesensordiffersfromconventionalfiberopticacousticsystems,asitiscapableofsensingAEemissionsatseveralpointsalongthelengthofasinglefiber.Multiplexingprovidesforsinglechanneldetectionofcracksandtheirlocationsinlargestructuralsystems.AnalgorithmwasdevelopedforsignalrecognitionandtaggingoftheAEwaveformsfordetectionofcracklocations.Laboratoryexperimentsonplainconcretebeamsandpost-tensionedFRPtendonswereperformedtoevaluatethecrackdetectioncapabilityofthesensorsystem.Theacousticemissionsensorwasabletodetectinitiation,growthandlocationofthecracksinconcreteaswellasintheFRPtendons.TheAEsystemispotentiallysuitableforapplicationsinvolvinghealthmonitoringofstructuresfollowinganearthquake.