英语翻译
13.7LaserInspection
Therearetwodistincttypesoflaserinspectionsystems.Thefirstusesascanninglaserasthelightsource
foracamera-basedinspectionsystem.Theinspectionisbasedsolelyonthevisualappearanceofthejoint.
Thesecondlasertechnique,knownastheVanzettisystem,usesalasertoheateachsolderjoint
individually,thenusesanIRdetectortomonitorhowrapidlythejointlosesheat.Theheatlossrateis
anindicationofbothpropersoldervolumeandproperconnectiontothesubstrate.Thissystemwill
detectvoidsaswellassolderinsufficients,sincethevolumeofajointwithlargevoidsinitwillinhibit
heattransferfromthejointtotheboard.
Relativelylowinspeedandhighincost,laser-basedcamerasystemscanbeusedforpost-deposition
solder-pastevolumemeasurements,aswellaspost-reflowsolderjointinspections.Likevisualinspectors,
lasersystemsmusthavedirectvisualaccesstothejointstheyaretoinspect.
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