In view of the above green laser pointer cleaning machine, the pulse width, pulse waveform and light intensity distribution have been fixed, so the experimental test is mainly carried out in terms of power density (energy density), spot size, and spot overlap rate, and how various factors affect the pulsed laser The cleaning efficiency and cleaning effect of cleaning rust. Excluding the effect of spot overlap rate and power density, the visible spot size has nothing to do with the number of cleanings; keep the power density and spot overlap rate unchanged, and the larger the spot size, the faster the scanning speed and the filling interval can be improved, thereby improving the cleaning efficiency.
As the spot size becomes larger, the cleaning efficiency increases linearly, the amount of rust residue becomes less and less, and the substrate becomes lighter and lighter. When the light spot is small, on the one hand, the surface of the substrate is melted, and the local rust layer is integrated into the substrate; The thermal expansion stress at the layer interface is reduced, and the removal ability is weakened. The combination of the above two aspects leads to a decline in cleaning ability.
When the power density and the spot overlap rate are determined, the size of the cleaning spot has nothing to do with the number of cleanings, that is, the thickness of a single removal is unchanged; the larger the spot size, the faster the scanning speed and the filling interval can be improved. In terms of increasing the cleaning speed of the green laser pointer, the heat accumulation of the substrate is reduced, the surface oxidation of the substrate is improved, and the removal ability becomes stronger.