The Q Value Measurement of the Shadow Mask Surface Based on Laser Triangulation Measurement Technology

Abstract

Using the triangulation method of laser non-contact measurement, the surface shape of CRT's shadow mask and the Q value was high precision measured. Measuring the mesh surface, the laser beam may be all or part through the mesh. The extraction problem of the effective measurement data was studied. Setting the threshold to filter out the invalid data and the data influenced by the mesh, it retained a small amount of valid data. Using data fitting and interpolation methods to process part of the effective data, then extracting the geometry of the mesh surface profile, the good reproducibility results was gotten. The advanced measuring equipment used in production practice was also studied.