A tungsten wire probe is a probe used for electron microscopy testing. It is a slender probe made of a tungsten wire. In electron microscope testing, tungsten wire probes are used as one of the electron sources to generate high-energy electron beams to scan the sample surface to obtain morphology and composition information of the sample.
1. Structure of tungsten wire probe
The tungsten wire probe is mainly made of a tungsten wire, which is slender and has a small diameter. Its length is usually between a few millimeters and several centimeters, and its diameter is between a few micrometers and tens of micrometers. During the manufacturing process, the tungsten wire is usually welded to a metal rod for ease of installation and use.
2. Working principle of tungsten wire probe
The working principle of tungsten wire probe is based on the excitation of electron beam. When current passes through the tungsten wire, heat is generated and the temperature of the tungsten wire increases due to the resistance effect of the tungsten wire. When the temperature of the tungsten wire is high enough, the electrons inside it will gain enough energy and be released in the form of a high-energy electron beam. When these high-energy electron beams scan the sample surface, they interact with the sample, thereby stimulating various physical and chemical information of the sample.
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