>> P.215
MeasurementPrincipleLSMdisplaysdimensionsbasedonthetimeashadowappearswhenatightparallellaserbeamisblockedbytheworkpiece.Asinthefigureatright,thelaserbeamemittedfromthesemiconductorlasersynchronizeswiththeclockpulseandisreflectedbythepolygonalmirrorrotatingathighspeed.Thenitisconvertedtoaparallelbeambythecollimatorlens(fθlens),minimizingthebeamdiameteratthemeasurementposition.Thelaserbeamscanstheworkpieceathighspeedasaparallellightsource,collectedbythephotodetectorʼThephotodetectorgeneratesoutputvoltageaccordingtothepresenceorabsenceoflightwhenthelaserbeamisblockedbytheworkpiece.Thechangingvoltagemakesitpossibletocountthepulsesgeneratedinthetimethelaserbeamisblockedbytheworkpiece,processedbytheCPUandoutputtoexternaldevicesasdimensions.Throughthismeasurementprinciple,itispossibletomeasurenotjusttheworkpiece(darkpart)butalsothegapbetweenworkpieces(lightpart).Segments(light/darknumbers)canbespecifiedandswitchedtomeasurespecificparts.scondenserlens.SystemConfigurationCondenserlensWorkpieceCollimatorlensMotorPhotodetectorPolygonalmirrorPhotodetector(resetsignal)SemiconductorlaserExternalequipment(PLC)USBorGeneral-purposeEthernetLSMControllerApplicationsS/WforPCLSMControllerforin-lineI/FmoduleLSMControllerLSMSensor(LSM-02-A/LSM-30-A)5-2
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