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1. Metallurgical
Microscope
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2. • Metallurgical Microscope is the most
important tool for the Metallurgist for
observing a microstructure and studying
various metals or alloys for their use in
engineering applications.
• In contrast to biological microscopes ,this
microscope uses the principal reflection of
light,which will be due to polished or opaque
specimen-surface.
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3. Types of Metallurgical Microscope
• Optical microscope
• Scanning electron microscope(SEM)
• Transmission electron microscope(TEM)
• Auger electron microscope
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4. Microscope Vocabulary
• Magnification: increase of an
object’s apparent size
• Resolution: power to show
details clearly
• Both are needed to see a clear
image
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5. Ocular lens
Body Tube
Revolving Nosepiece
Arm
Objective Lens
Stage
Stage
Clips Coarse adjustment knob
Fine adjustment knob
Base
Diaphragm
Light
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6. Ocular lens
magnifies; where you
look through to see the
image of your specimen.
They are usually 10X or 15X
power. Our microscopes
have an ocular lens power
of 10x.
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7. arm
supports the tube
and connects it to
the base
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8. stage
the flat platform
where you place
your slides
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9. coarse adjustment knob
moves stage (or
body tube) up and
down
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10. base
the bottom of the
microscope, used for
support
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11. body tube
connects the
eyepiece to the
objective lenses
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12. revolving nosepiece
the part that holds two
or more objective
lenses
and can be rotated to
easily change power
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13. objective lens
Adds to the magnification
Usually you will find 3 or 4
objective lenses on a
microscope. They almost
always consist of 4X, 10X,
40X and 100X
powers. When coupled
with a 10X (most common)
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14. objective lenses
The high power objective
lenses are retractable (i.e.
40XR). This means that if
they hit a slide, the end of
the lens will
push in (spring loaded)
thereby protecting the lens
and the slide.
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15. stage clips
Stage clips hold the slides in
place. If your microscope
has a mechanical stage, you
will be able to move the
slide around by turning two
knobs. One
moves it left and right, the
other moves it up and
down. http://alltypeim.blogspot.in/

16. diaphragm
controls the amount of light
going through the specimen
Many microscopes have a
rotating disk under the
stage. This diaphragm has
different sized holes and is
used to vary the intensity
and size of the cone of light
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17. light
makes the specimen
easier to see
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18. Construction and Working
• A draw tube carrying eyepiece at its top end
slides within the body tube of the Microscope
with the help of a rack or pinion arrangement
by rotating coarse or fine adjustment knobs.
• Sliding of draw tube within body tube allows
varying distance between the eyepiece or
objective thus helps focusing of the object.
• Fine adjustment knob helps final focusing of
object.
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19. • The objective located at bottom and of body
tube structure of the metal specimen and the
eyepiece enlarges the images formed by the
objective.
• Eyepiece are available with different
magnifying powder such as
5X,10X,15X,etc.,the powder being marked on
them.
• The light source inside the side tube of
microscope provides illumination for
specimen.
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20. • The light from the source passes through a
collimating lens or a diaphragm in a controlled
amount.
• The incident light from external light source
falls on a plane glass reflector kept at 45
degree.
• The reflected light beam now passes through
the objective or plane glass reflector to form
the final image.
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21. • The image created(any magnified by
objective) is further magnified by eyepiece
lens,the gross magnification being product of
the magnification of the objective & eye-lens.
• The usual value of magnification for optical
microscope is 2000X.
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23. Thank
you
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