520-294-5600 4dinfo@nanometrics.com

Measuring Curved and Round Surfaces with the 4D InSpec

APPLICATION NOTE:

4D InSpec depends on diffuse reflected light to image the surface. In ordinary use, the light source and imaging system are angled to brightly illuminate the surface, producing a strong diffuse reflection, while the specular reflection is directed past the imaging system.

However, the specular reflection produces a bright line on a cylinder and a bright spot on a sphere, which can saturate the imaging system in those areas. Too much light, and the area will have no data.

In this application note we will discuss curved metal surfaces such as a cylinders and spheres, and provide steps you can take to obtain better measurements on them.

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