6 good questions and answers about "Materials - Imaging techniques"

What can you do/get information about with optical microscopy?
  • Crystallographic knowledge
  • Phase identification
  • Grain size
  • Shape and distribution
  • Presence of defects   
  • Mechanical deformations
  • Amorphous components 
How does a polarizing microscope work?
  • Minerals reorient the planes in which light is vibrating -> some light passes through the polarizer
  • Only the light scattered by defects and boundaries is observed above the dark background = colors visible
    • The colors are different for each mineral
What can Metallographic analysis inform us about?
  • Raw materials
  • Production techniques and conditions
  • Manufacturing methods
  • Post-depositional corrosion   
About what can you gain information by the means of a polarizing microscope?
Determine what element is present in the object
What are possible outputs of SEM?
  • Backscattered electrons
  • Secondary electrons (emitted by atoms after inonization process)
    • Ionization = deeltjes een elektrische lading aanbrengen)
  • Characteristic X-rays
  • Light (cathodoluminescence)  
X-ray CT scanner characteristics
  • Used for imaging - more 3D view
  • Does not measure composition
  • Used on corroded/altered metals 
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