2. Communication between communication radar and navigation transmitting equipment includes short-wave transmitting station, microwave communication station, ground satellite communication station and mobile communication station.
3. Industrial, scientific research and medical high-frequency equipment. This kind of equipment converts electric energy into heat energy or other energy for utilization, but it leaks out with electromagnetic radiation, causing environmental pollution in the workplace.
Industrial electromagnetic radiation equipment: mainly high-frequency induction heating equipment, such as high-frequency quenching, high-frequency welding and high frequency furnace, high-frequency melting equipment and high-frequency medium heating equipment, such as plastic packaging machine, high-frequency drying processor and high-frequency medium heating linkage machine.
Medical electromagnetic radiation equipment: mainly short wave and ultrashort wave physiotherapy equipment, such as high frequency physiotherapy machine, ultrashort wave physiotherapy machine, ultraviolet physiotherapy machine, etc.
Scientific research on electromagnetic radiation equipment: mainly electron accelerators, various ultrasonic devices, induction cookers, etc.
4. Electromagnetic radiation interference of transportation systems, including electrified railways, light rail and electrified railways, trams and trolleybuses.
5. Electromagnetic radiation of power system. High voltage transmission lines include overhead transmission lines and underground cables, and substations include power plants and substations.
6. Electromagnetic radiation of household appliances, including microwave heating and transmitting equipment, including computers, monitors, televisions, microwave ovens, wireless telephones, etc.
Man-made electromagnetic wave pollution includes:
1, pulse discharge. For example, when a high-current circuit is cut off, spark discharge has a large transient current, which will produce strong electromagnetism. It is essentially the same as lightning, but the affected area is smaller.
2. Power frequency alternating electromagnetic field. For example, the electromagnetic fields near high-power motors, transformers and transmission lines do not radiate outward in the form of electromagnetic waves, but will cause serious electromagnetic interference in the near field.
3. Radio frequency electromagnetic radiation. Such as radio broadcasting, television and microwave communication. , wide frequency range, large influence area, which can cause harm to near-field staff. Radio frequency electromagnetic radiation has become the main factor of environmental electromagnetic wave pollution.
Refer to the above content: Baidu Encyclopedia-Electromagnetic Wave