Electronic devices play a very important role in daily life, technological production, and national defense and military industry, especially in the current information age, where controlling information is particularly important. Nowadays, many occasions require the use of electromagnetic shielding devices, such as information encryption protection, signal shielding, etc. For example, we need to use shielding devices to prevent cheating in exams. So what is the specific electromagnetic principle of shielding equipment? What materials are used in material selection? Let the editor take you to understand.
Electromagnetic principles and material selection knowledge of shielding equipment
The signals of electronic devices are continuous electromagnetic waves, which generate two paths when encountering metal substances, one is penetration, and the other is reflection. The reflected electromagnetic waves are blocked outside the shielding equipment, while the electromagnetic waves penetrating the metal layer become weaker due to some losses during the penetration process. After seeing a penetration, some electromagnetic waves penetrate the metal layer and continue to emit forward, but some electromagnetic waves will continue to reflect inside the metal and cycle in sequence, weakening the electromagnetic waves. Through this model, we can understand the basic principles of electromagnetic shielding. One is to enhance the shielding ability of the shielding material, and the other is to thicken the shielding material.
Let's consider the material selection of shielding equipment here. For electric field shielding, high conductivity materials, especially copper, iron, and aluminum, are relatively good, while in magnetic field shielding, materials such as nickel steel and silicon need to be used. Generally speaking, shielding equipment that combines aluminum, steel, and copper has strong reflection performance and good loss effect on electromagnetic waves. The combination of iron and high permeability alloys has strong electromagnetic wave absorption ability. Therefore, there are multiple choices in specific material selection, which can be judged based on specific usage situations.
The above is the electromagnetic principle and material selection knowledge of shielding equipment. I believe you will gain something after reading it. Nowadays, there are more and more means of information blocking, largely because people attach increasing importance to information. In the future, with the rapid development of the Internet and information technology, more blocking devices will be put into use. As a professional manufacturer of shielding equipment, our company will also seize the opportunity to develop shielding equipment that better meets market expectations and satisfies everyone.
