At present, electron microscopy has become an important means to study the microstructure of the body. Next, I will introduce the principle, applications, and types of electron microscope lenses to you.

What's an electron microscope？

The electron microscope is an instrument that uses electron beams and electron lenses instead of light beams and optical lenses to image the fine structures of substances at very high magnifications based on the principle of electron optics. It is capable of much higher magnifications and has a greater resolving power than a light microscope, allowing it to see much smaller objects in finer detail.

When was the first electron microscope invented?

In 1931-33 Max Knoll and his student Ernst Ruska developed the world's first transmission electron microscope. And the first prototype of the electron microscope was presented at the Technical University of Berlin by Ernst Ruska and Max Knoll in 1931. Although limited at that time, the resolution was not as good as that of the light mirror, but it created a pioneer in the development of electron microscopy technology. In 1935, Knoll, who turned to television technology, proposed the concept of scanning electron microscopy. In 1939, transmission electron microscopy plus scanning function realized STEM. Ernst Ruska (Ernst. Luska, the living inventor of the electron microscope, won the Nobel Prize in 1986.

What is the use of an electron microscope?

Electron microscopes are used to study the ultrastructure of biological and inorganic specimens like microorganism cells, biopsy samples, metals, and crystals are investigated by using an electron microscope. including microorganisms, cells, macromolecules, biopsy samples, metals, and crystals. In industry, electron microscopes are commonly used for quality control and fault analysis.

Which lens is used in an electron microscope?

Because the glass lenses like concave and convex lenses can't detect the beam of electrons. so, they are only used only in a light microscope. An electron microscope can detect the beam of electrons. There are many kinds of electron microscope lenses, but what they have in common is that they use electromagnetic action. and lenses of the electron microscope correspond to the condenser lens, objective lens, intermediate lens, eyepiece, and projector lens. Compared to an optical microscope, the lens itself has a different structure, even if it uses the same name, "lens," because an electron beam is used as the light source. They use shaped magnetic fields for the electron-optical lens system. The beam of electrons cannot be focused on a normal glass lens like a concave or convex lens. They are used only in light microscopy. So, in an electron microscope, electromagnetic lenses are used.

Types of electron microscope

Transmission electron microscopes and scanning electron microscopes are commonly used. Transmission electron microscope (TEM) Transmission electron microscope (TEM), commonly known as an electron microscope or electron microscope (EM), is the most widely used electron microscope.

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