At present, there is no uniform standard for the structure of laser cleaning machines. It needs to be determined according to factors such as the actual cleaning method, the type of substrate and dirt, and the effect of cleaning requirements. However, they are still roughly the same in some basic structures. , Mainly including lasers, mobile platforms, real-time monitoring systems, semi / automatic control operating systems and other auxiliary systems.
These adsorption forces are much larger than gravity (there are several orders of magnitude) and are related to the particle diameter d. The adsorption force exhibits a slow linear decay trend with decreasing particle radius, and the particle mass m is proportional to the cube of the diameter According to Newton's law, F = ma, when the particle size becomes smaller, the acceleration provided by the adsorption force increases rapidly. Therefore, the smaller the particle size, the greater the acceleration required to remove it. This is why it is difficult for conventional cleaning techniques to remove small-diameter objects.
Due to the complex composition and structure of the attachments on the surface of the object, the mechanisms by which lasers interact are also different. The most commonly used theoretical models for explaining this are as follows:
1.Gasification / photolysis of light
The laser generated by the laser cleaning machine's laser can be concentrated by the optical system to achieve a high degree of energy concentration. The focused laser beam can generate high temperatures of thousands or even tens of thousands of degrees near the focal point, which can instantly vaporize the attachments on the surface of the object or break down.
2.Light peeling
The attachment of the surface of the object is thermally expanded by the action of the laser. When the expansion force of the attachment of the surface of the object is greater than the adsorption force between it and the substrate, the attachment of the surface of the object will detach from the surface of the object.
3.Light vibration
The laser cleaning machine uses a higher frequency and power pulsed laser to impact the surface of the object. Ultrasonic waves are generated on the surface of the object. The ultrasonic waves return to the lower hard surface during the impact and interfere with the incident sound waves, thereby generating high-energy resonance waves and causing tiny bursts of dirt. , Crush, detach from the surface of the substrate, this method can be used when the absorption coefficient of the laser beam between the object and the surface attachment is not much different, or when the surface attachment is heated, it will produce toxic substances.
