The difference between metallographic microscope and scanning electron microscope
A metallographic microscope is an optical microscope that uses an outgoing lighting fixture to observe the surface (alloy composition) of metal material specimens. It is a new technology product designed and developed by integrating microscope technology, photoelectric conversion technology, and electronic computer image processing technology. It can conveniently observe metallographic analysis images on electronic computers, and then analyze and grade metallographic analysis images, as well as output and copy images.
Scanning electron microscopy is a new type of optoelectronic device equipment. It has the characteristics of simple sample preparation, adjustable range of magnification, high screen resolution of images, and large depth of field. For decades, scanning electron microscopy has been widely used in industries such as molecular biology, medicine, and metallurgy, driving the development trend of various related courses.
There is a significant difference between the two types of optical microscopes, with the following key aspects:
1, The light source is different: a metallographic microscope uses visible light as the light source, while a scanning electron microscope uses ion beam as the light source for imaging.
2, The basic principles are different: metallographic microscopy uses geometric optical imaging principles for imaging, scanning electron microscopy uses high-efficiency ion beam negative electron on the surface of the specimen to stimulate various physical data signals on the surface of the specimen, and then uses different data signal detectors to receive physical data signals and convert them into image information content.
3, Screen resolution: Due to the interference and transmission effects of light, the screen resolution of a metallographic microscope is limited to the range of 0.2-0.5um. Due to the use of ion beams as the light source, scanning electron microscopy can achieve a screen resolution between 1-3nm. Therefore, the mechanism observation of metallographic microscopy belongs to μ m level analysis, while the mechanism observation of scanning electron microscopy belongs to nano level analysis.
4, Depth of field: Generally, the depth of field of a metallographic microscope is between 2-3um, so there is a very high requirement for the surface smoothness level of the specimen. Therefore, the entire sample preparation process is relatively complex. The depth of field of scanning electron microscopy can reach many.
A metallographic microscope is an optical microscope that uses an outgoing lighting fixture to observe the surface (alloy composition) of metal material specimens. It is a new technology product designed and developed by integrating microscope technology, photoelectric conversion technology, and electronic computer image processing technology. It can conveniently observe metallographic analysis images on electronic computers, and then analyze and grade metallographic analysis images, as well as output and copy images.
Scanning electron microscopy is a new type of optoelectronic device equipment. It has the characteristics of simple sample preparation, adjustable range of magnification, high screen resolution of images, and large depth of field. For decades, scanning electron microscopy has been widely used in industries such as molecular biology, medicine, and metallurgy, driving the development trend of various related courses.
