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WhatisNDT? Visualinspection
VisualinspectionWhatisNDT?
Visualinspection,withorwithoutopticalaids,istheoriginalmethodofNDT.Manydefectsaresurfacebreakingandcanbedetectedbycarefuldirectvisualinspection.
Opticalaidsincludelowpowermagnifiers,microscopes,telescopesandalsospecialiseddevicessuchasboroscopes,endoscopesandotherfibreopticdevicesfortheinspectionofrestrictedaccessareas.Thesedevicescanalsobeusedwithtelevisioncamerasystems.Muchofthesuccessofvisualinspectiondependsonthesurfaceconditionandthelightingarrangements.Surfacepreparationsuchascleaningandetchingisoftenusedandalsosurfacereplicascanbetakenforbothmacroandmicroscopicexamination.Insitumetallographyisalsopossible.
Highspeedvisualinspectionwithautomatedoutputisusedfortheinspectionofthesurfaceofsheetmaterialandtelevisiontechniquesmayuseenhancedimageandpatternrecognitionmethods.Remotephotographyofinaccessiblesurfaces,suchasinsidearadioactiveenvironment,isalsopossible.Highspeedcineisalsousedforstudyingfastevents.Arraysofopticaldiodescanbeusedinsteadoftelevisioncameras.
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