The metallurgical microscope is an important tool for metallurgists to observe microstructures of metals and alloys. Unlike biological microscopes, it uses reflected light due to polished metal surfaces. There are several types including optical, scanning electron, transmission electron, and Auger electron microscopes. Key components are the objective lenses, which provide magnification and resolve details, the eyepiece, body tube, stage, and light source. Objectives and magnification allow examination of microstructures critical for engineering applications of metals and alloys.

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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