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Working principle of laser cleaning head

Laser cleaning can not only be used to clean organic pollutants, but also can be used to clean inorganic substances, including metal rust, metal particles, dust, etc. What is the technical principle of laser cleaning machine?

The pulsed Nd:YAG laser cleaning process depends on the characteristics of the light pulses produced by the laser, based on the photophysical reaction caused by the interaction between the high-intensity beam, the short pulse laser and the contaminated layer. Its physical principle can be summarized as follows:

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

2. The energy density of the laser can be adjusted to make the dirt expand by heat. When the expansion force of the dirt is greater than the adsorption force of the dirt on the matrix, the dirt will be removed from the surface of the object.

3 The light pulse width must be short enough to avoid heat accumulation that would damage the treated surface.

4. The divergence Angle of the laser beam is small and the directivity is good. Through the concentrating system, the laser beam can be gathered into light spots of different diameters.

5. The absorption of large energy forms a rapidly expanding plasma (highly ionized unstable gas), which produces shock waves.

Each laser pulse removes a certain thickness of the contaminated layer. If the contamination layer is thick, multiple pulses are required for cleaning. The number of pulses required to clean the surface depends on the level of surface contamination. An important result of the two thresholds is the self-control of the cleaning. Light pulses with an energy density higher than the first threshold will keep removing contaminants until they reach the base material. However, because its energy density is lower than the damage threshold of the base material, the base is not damaged. Wuhan Ruifeng photoelectric laser equipment is cost-effective, with many years of laser research and development experience, product technology is mature, product performance is safe and stable. Ruifeng photoelectric laser electric always adhere to the "quality first, service second, price third" attitude, to provide customers with the best quality products and services.

The above is the technical principle of laser cleaning machine, laser cleaning and mechanical friction cleaning, chemical corrosion cleaning and other traditional cleaning methods, there are obvious advantages. It is efficient, fast, low cost, small thermal load and mechanical load on the substrate, and non-damaging for cleaning; Do not harm the health of the operator; The cleaning process is easy to achieve automatic control, remote control cleaning and so on. It can be seen that laser cleaning technology will gradually replace some traditional cleaning methods in the future.