What is the principle of laser cleaning machine?


The principle of the laser cleaning machine is that when the rust is subjected to high temperature, it will evaporate instantly. After the plasma is separated, due to the high reflectivity of the underlying metal to light, the rust removal part will not be damaged even if exposed to the laser. The laser rust removal method is effective and safe, so no matter whether it is difficult to remove the rust, it can be easily dealt with. As long as light can reach, rust has nowhere to hide.

  Why can a laser be used for cleaning? Why does it not cause damage to the object being cleaned? First, understand the nature of the laser. To put it simply, lasers are no different from the shadowy light (visible light and invisible light) around us, except that the laser uses a resonant cavity to gather light in the same direction, and has a simpler wavelength, coordination, etc. The performance is better, so in theory all wavelengths of light can be used to form lasers, but in fact, it is limited by the fact that there are not many media that can be excited, so the laser light sources that can produce stable and suitable for industrial production are quite limited. The most widely used ones are probably Nd:YAG lasers, carbon dioxide lasers and excimer lasers. Since Nd: YAG laser can be transmitted through optical fiber and is more suitable for industrial applications, it is also used in laser cleaning.

   Its physical principles can be summarized as follows:

   1) The light beam emitted by the laser is absorbed by the contamination layer on the surface to be treated.

  2) Absorption of large energy forms a rapidly expanding plasma (a highly ionized unstable gas), which generates shock waves.

  3) The shock wave turns pollutants into fragments and is removed.

  4) The light pulse width must be short enough to avoid heat accumulation that damages the surface to be processed.

  5) Experiments show that when there is oxide on the metal surface, plasma is generated on the metal surface.


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