Why plasma has an invisible function

• Categories:Industry News
• Author:plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing
• Origin:
• Time of issue:2020-08-13
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(Summary description)This is mainly because of the refraction and absorption of radio waves by plasma. This can quote it related materials are given: plasma is a special kind of filter, when radar frequencies below the plasma frequency radar is total reflection, the plasma energy in the form of electromagnetic wave reflection body electronic jamming to radar, namely, by bending radar wave transmitted back and forth is attacking weapon virtual image that appeared on the radar screen, rather than the real weapons. When the radar frequency is higher than the plasma frequency, the radar wave can enter the plasma and be absorbed, so that the signal of attack weapon received by the radar will be greatly weakened. These functions make plasma become a new electronic interference and stealth material, among which stealth technology is a promising technology. Absorption effect on plasma for radio waves can be experienced from the satellite/ship recycling process of "black area" have a intuitive understanding: when the satellite/spacecraft returned to the atmosphere with fast speed, the surface temperature will because of severe air friction shot up to several thousand, tens of thousands of degrees Celsius, the satellite and the surface of the spacecraft will because of the temperature and air into a plasma and the satellite/ship tightly wrapped. Since plasma has a strong absorption effect on radio, ground tracking radar will lose target because of no echo signal, and wireless communication cannot be carried out due to the wrapping of plasma air mass. At this point, all contact between the satellite/spacecraft and the ground will be broken, forming the so-called "black barrier area". Only when the speed of the satellite/spacecraft drops and the surface air temperature drops can the radar be tracked again after the plasma disappears and the communication can be restored to normal.