What is the difference between optical microscope and electron microscope
Optical microscopes and electron microscopes are two different types of microscopes. They are different in definition, classification, and composition.
1. Different definitions
Optical microscope (English Optical Microscope, abbreviated as OM) is an optical instrument that uses optical principles to magnify and image tiny objects that cannot be distinguished by the human eye, so that people can extract fine structural information.
The application of electron microscopy technology is based on the optical microscope. The resolution of the optical microscope is 0.2μm, and the resolution of the transmission electron microscope is 0.2nm. That is to say, the transmission electron microscope has a magnification of 1000 on the basis of the optical microscope. times.
2. Different classifications
There are many classification methods for optical microscopes. They can be divided into trinocular, binocular and monocular microscopes according to the number of eyepieces used; they can be divided into stereoscopic vision and non-stereoscopic vision microscopes according to whether the image has a three-dimensional sense; they can be divided into stereoscopic vision and non-stereoscopic vision microscopes according to the observation object. Biological and metallographic microscopes, etc.; according to optical principles, they can be divided into polarized light, phase contrast and differential interference contrast microscopes, etc.
Electron microscopes can be divided into transmission electron microscopes, scanning electron microscopes, reflection electron microscopes and emission electron microscopes according to their structures and uses.
3. Different composition and structure
The optical system of a microscope mainly consists of four components: objective lens, eyepiece, reflector and condenser. Broadly speaking, it also includes illumination sources, filters, coverslips and slides, etc.
The electron microscope consists of three parts: lens tube, vacuum device and power cabinet.
