eyepiece
body tube
coarese adjustment
fine adjustment
revolving nose piece
objective
arm
stage clip
stage
inclination joint
base
mirror
diagraph
To form an image, a scanning electron microscope works by using electrons instead of light. The construction of the microscope includes an electron gun, electron beam, anode, magnetic lens, scanning coils, backscattered electron detector, and a secondary electron detector that sit on a stage that holds the specimen.
ELECTRON GUN
An electron gun (also called electron emitter) is an electrical component that produces an electron beam that has a precise kinetic energy and is most often used in television sets and computer displays which use cathode ray tube (CRT) technology, as well as in other instruments, such as electron microscopes and particle.
ELECTRON BEAM
Cathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, the glass opposite of the negative electrode is observed to glow, due to electrons emitted from and travelling perpendicular to the cathode (the electrode connected to the negative terminal of the voltage supply). They were first observed in 1869 by German physicist Johann Hittorf, and were named in 1876 by Eugen Goldstein kathodenstrahlen, or cathode rays.[1]
ELECTRON BEAM POSITIONING
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BEAM DIAMETER REDUCTION
FOCUSING LENSES
VISUAL TRANSMISSION
VACUUM MANIFOLD
CONDENSER
APARTURE CHANGER
APERTURE DIAPHRAGM
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STAGE
VACCUUM CHAMBER
1. Eyepiece
Contains a magnifying lens that focuses the image from the objective into your eye.
2. Course Adjust
For focusing under low magnification
3. Fine Adjust
For focusing under high magnification or low
4. Low Power Objective
For large specimens or overview
5. High Power Objective
For detailed viewing or small specimens
6. Specimen on glass slide
What you want to look at
7. Stage
Supports specimen in correct location to lens
8. Condenser
Focuses the light on specimen
9. Diaphragm (iris or disc)
Regulates amount of light and contrast
10. Light Source
Illuminates the specimen for viewing
parts and function of electron beam positioning
In an electron microscope, a stream of electrons takes the place of a beam of light and allows us to see things smaller even than light itself. A SEM produces images that appear 3-D.
Electron microscope
scanning electron microscope
an electron microscope can magnify something up to 500,000 times
The three main parts of the microscope are the Mechanical parts, Magnifying parts and the Illuminating parts.
an electron microscopean elctron microscope
parts and function of electron beam positioning
parts of microscope and their function
Electron microscope
Electron microscope
a transmission electron microscope
compound microscope parts and function
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scanning electron microscope
enumerate thedifferent parts of a compound microscope write and function of each
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ocular and objective....
an electron microscope can magnify something up to 500,000 times