In recent years, laser scanning technology has been continuously developing and maturing. The scanning equipment has also gradually become commercialized. The huge advantage of smart laser scanners is that they can quickly scan the measured object and directly obtain high-precision point cloud data. This makes it efficient to model and virtually recreate the real world. Therefore, it has become one of the current research hotspots and has been widely used in cultural relics digital protection, civil engineering, industrial measurement, natural disaster investigation, digital city terrain visualization, urban and rural planning, and other fields.
Galvanometer-based smart laser scanning system is a high-precision, high-speed servo control system with a driver board and a high-speed oscillating motor as the core components. It is mainly used in laser cutting, laser engraving, laser drilling, and lattice laser medical beauty industry. In the application system, it is usually composed of modules such as a computer, laser, scanning galvanometer drive power supply, laser power supply, optical path system, etc. Its working principle is that the laser emitted by the laser source goes through the optical path system, and after two reflections of the X-axis and Y-axis mirrors in the scanning galvanometer, it is projected onto the XY plane of the observation screen, forming a scanning point. Any complex planar trajectory can be realized by controlling the deflection of the two mirrors of the galvanometer.
In the processing of smart laser scanner, laser cutting uses a high-power density laser beam that is focused to irradiate the workpiece to rapidly melt, vaporize, ablate, or reach the ignition point of the material being irradiated, and at the same time, it relies on a high-speed airflow coaxial with the beam to blow away the molten material, thereby achieving the purpose of cutting the workpiece. Laser cutting can be divided into four types: laser vaporization cutting, laser melting cutting, laser oxygen cutting, and laser scribing and control fracture. Laser cutting is one of the thermal cutting methods, and its overall characteristics are fast cutting speed and high quality compared with other thermal cutting methods.
Laser marking technology is one of the largest application areas of laser processing systems. Laser marking is a marking method that uses a laser with high energy density to locally irradiate the workpiece, causing the surface material to vaporize or undergo a chemical reaction that changes color, thus leaving a permanent mark. Laser marking can mark various texts, symbols, and patterns. The character size can be from millimeter to micrometer level, which has special significance for product anti-counterfeiting.
The basic principle of laser marking is that a high-energy continuous laser beam is generated by a laser generator. The focused laser acts on the substrate material, causing the surface material to melt instantly or even vaporize. By controlling the laser's path on the material surface, the required graphic or text mark is formed. The characteristic of laser marking is non-contact processing, which can mark on any shaped surface, and the workpiece will not deform or produce internal stress. It is suitable for marking metal, plastic, glass, ceramics, wood, leather, and other materials. Laser marking can mark almost all parts (such as pistons, piston rings, valves, valve seats, hardware tools, sanitary ware, electronic components, etc.), and the marked parts have small deformation with wear-resistant markings. The laser marking machine uses a scanning method to mark. That is, the laser beam is incident on the two reflection mirrors, and the computer controls the scanning motor to drive the reflection mirrors to rotate along the X and Y axes respectively. The focused laser beam falls on the marked workpiece, forming the trace of laser marking.