Everything in nature, as long as the temperature is above zero in absolute temperature, is constantly transmitting heat in the form of electromagnetic waves. This way of transmitting energy is called radiation. The energy emitted by an object through radiation is called radiant energy. Radiation is calculated in roentgen/hour (R). An important feature of radiation is that it is "equal." Regardless of the temperature of the object (gas) radiating outward, the object A can radiate to the object B, and B can also radiate to the armor. This is different from conduction, which is one-way. People who have encountered a lot of radiation wash their entire body with soap and plenty of water, and immediately seek the help of a doctor or expert! (The picture shows the warning signs of “radioactive substance danger, careful radiationâ€) 1. Common electromagnetic radiation sources: general For example, radar systems, television and broadcast transmission systems, radio frequency induction and medium heating equipment, radio frequency and microwave medical equipment, various electrical processing equipment, communication transmitting stations, satellite earth communication stations, large power stations, power transmission and transformation equipment High-voltage and ultra-high-voltage transmission lines, subway trains and electric trains, and most household appliances are all sources of electromagnetic radiation that can produce various forms, frequencies, and strengths. Electromagnetic radiation Division of the radiation field: The electromagnetic radiation field is generally divided into a far field and a near field. Near field and characteristics: The area centered on the field source, which is usually called the near field, can also be called the induction field. The near-field field usually has the following characteristics: There is no certain proportional relationship between the electric field strength and the magnetic field strength in the near-field field. Namely: E1377H. In general, for a field source with a small voltage and a small current (such as a transmitting antenna, a feeder, etc.), the electric field is much stronger than the magnetic field. For a field source with a large voltage and low current (such as the mold of some induction heating equipment), the magnetic field is It is much larger than the electric field. The electromagnetic field strength of the near field is much larger than that of the far field. From this perspective, the focus of electromagnetic protection should be in the near field. The electromagnetic field strength of the near-field field changes rapidly with distance, and the unevenness in this space is large. The far field and its characteristics are centered on the field source, and the spatial range outside the wavelength is called the far field, which can also be called the radiation field. The main features of the far field are as follows: In the far field, all electromagnetic energy is radiated in the form of electromagnetic waves, which is much slower than the induction field. In the far field, the electric field strength has the following relationship with the magnetic field strength: In the International System of Units, E=377H, the electric field and the magnetic field are perpendicular to each other, and are perpendicular to the propagation direction of the electromagnetic wave. The far field is a weak field and its electromagnetic field strength is small. The meaning of the division between the near field and the far field: Generally, for a fixed electromagnetic radiation source that can generate a certain intensity, the electromagnetic field intensity of the near field radiation is large, so we should pay special attention to the near field of electromagnetic radiation. Protection. In addition, there should be a concept for the near-field field, which ranges from 10 meters to 1 meter for the range of frequencies from the short-band 30MHz to the microwave segment of 3000MHz.
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Features
1.Well tensile propertie
2.Protect wire from the vibration of wire.
3.Good corrosion resistance
4.Easy installation
