简介:OnaccountofthemultiformityofMEMSdevices,itisnecessarytointegratewithsomeopticalmeasurementtechniquesformeetingstaticanddynamicunittestrequirements.Inthispaper,anautomatedMEMStestsystemisbuiltofsomecommerciallyavailablecomponentsandinstrumentsbasedonvirtualinstrumenttechnology.Thesystemisintegratedwithstroboscopicimaging,computermicro-vision,microscopicMirauphaseshiftinginterferometry,andlaserDopplervibrometer,andisusedforthemeasurementoffull-viewin-planeandout-of-planegeometricparametersandperiodicalmotionsandsinglespotout-of-planetransientmotion.Thesystemconfigurationandmeasurementmethodsareanalyzed,andsomeapplicationsofthemeasurementofin-planeandout-of-planedimensionsandmotionsweredescribed.Themeasurementaccuracyofin-planedimensionsandout-of-planedimensionalisbetterthan0.2μmand5nmrespectively.Theresolutionofmeasuringin-planeandout-of-planemotionsisbetterthan15nmand2nmrespectively.
简介:AmongthecurrentreformmeasuresundertakeninChineseK-12education,toadoptNewCurriculaandtoimproveICTapplicationinteachingarebothdecisive,however,thelackofqualifiedtrainersishandicappingtheprofessionaldevelopmentofover10millionsin-serviceteachers.OneofeChina-UKprojectsincollaborationbetweenuniversitiesfrombothsidesisdesignedtodevelopvirtuallearningcommunity(VLC)amongin-serviceteachersandexplorefrompedagogicperspectivehowtoconductVLC.Inaccordancewithreflectivelearningandcollaborativelearning,threeonlinelearningmoduleshavebeenjointlycreatedbyChineseandUKeducationalspecialists,andoneunitfromeachmodulehasbeenpilotedbyagroupofseniorteachers.Throughanalyzingtheprocessesofcoursedesignandpilot,supportedbyquantitativeandqualitativeresearchintotheexperiencesofpilotparticipants,thepaperidentifiessomecorefactorsinfluencingthequalityofVLCandsuggeststhatmoreattentionshouldbegiventotheinteractivelearningprocesswithinVLCratherthantocreatewell-structuredlearningmaterialsbeforehand.IthasalsoanalyzedVLCasapromisingapproachtosupportprofessionaldevelopmentofin-serviceteachersfromtheperspectiveofcontinuousimprovementprocess.ThereismuchtoberesearchedintotheapproachofVLC.