| With
this instrument, magnification upto 1,00,000 times is possible. Can view
fracture surfaces directly without any polishing.
In
the normal mode of SEM operation, secondary electrons emitted from the
sample surface are used to form the image. The intensity of secondary
electron emission is extremely sensitive to the localised surface morphology
of the sample, so the image formed will be a repressentation of the true
specimen surface.
The
CTR display is not a direct image of the surface as it would be in an optical
microscope, but rather it is a depiction of the surface formed by mapping
the result of the interaction of the electron beam with the surface, produced
in levels of black through white.
This
instrument is used for analyzing the defects in casting, like slag or sand
inclusion, Hair line crack, etc |
