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1、AReal-TimeSystemforMonitoringDistantDynamicDisplacementofStructuresCHENJun-FengZHAOWen-guangLUOHong-binLIPeng-huiWENYin-pingAbstract:Basedondigitalimageprocessingtechnique,areal-timesystemisdevelopedtomonitoranddetectthedynamicdisplacementofengineeringstruct
2、ures.Byprocessingpictureswithaself・programmedsoftware,thereal-timecoordinateofanobjectinacertaincoordinatesystemcanbeobtained,andfurtherdynamicdisplacementdataandcurveoftheobjectcanalsobeachieved・Thatis,automaticgatheringandreal-timeprocessingofdatacanbecarr
3、iedoutbythissystemsimultaneously.Forthissystem,first,anuntouchedmonitoringtechniqueisadopted,whichcanmonitorordetectobjectsseveraltohundredsofmetersapart;second,ithasflexibleinstallationconditionandgoodmonitoringprecisionofsub-millimeterdegree;third,itisfitf
4、ordynamic,quasi-dynamicandstaticmonitoringoflargeengineeringstructures.Throughseveraltestsandapplicationsinlargebridges,goodreliabilityanddominaneeofthesystemisproved.Keywords:dynamicdisplacement;real-timemonitoringanddetecting;sub-pixel;systemcalibration;dy
5、namictrackingCLCnumberTP751.1;TU196.4IntroductionMeasureddynamicdisplacementdataofastructureisvaluableindynamicmonitoring,detectionandanalysis11-3].However,atpresent,real-timemonitoringanddetectionofdynamicdisplacementoflargeengineeringstructuresisadifficult
6、problem,duetothelimitationoftheexistingmeasurementdeviceandtechnique.Accordingtodetectionresults,existingdetectionmethodsfordynamicdisplacementcanbedividedintotwokinds:thedirectmethodandtheindirectmethod[4].Fortheformermethod,adatumpointshouldbecontained,whi
7、chisfixedrelativetothedynamicpoint,therelativedisplacementbetweendynamicandfixedpointisdetectedbyasensor.Becauseofthelessspaceoccupiedforthemini-structure,afixeddatumpointcanbefoundallthetime.Ahighdegreeofmeasurementprecisionanddynamicresponsecanbeobtained,s
8、oautomaticprocessingandreal-timeoutputcanbecarriedout.Itisdifficulttofindafixeddatumpointaroundadynamicpointofthelargestructures,suchaslong-spanbridges,highrisestructuresandsoon.Alongwiththeincr
