3. Episcopia, industrial vision. Reflection, diffusion

This measurement method uses light that is reflected or scattered by the object to be measured, with the illumination and light-measuring device arranged in close proximity to each other. Three main measurement modes are used:

• image-based measurement in episcopy or machine vision;

• measurement of reflected or scattered light intensity using detectors or optical fibers;

• measurement by triangulation, by measuring the position of a point of light reflected by the surface to be measured, or by analyzing the image of a raster reflected by the surface to be measured.