What is the difference between "specular" and "diffuse" targets?

The MT100 series 1" standoff heads are specular heads, i.e. ; they can only be used when measuring to a specular or mirror-like surface. These heads offer the highest resolution, but the shortest measurement range.

In many cases, a target can be made specular by the addition of a small first-surface mirror attached to the surface to be measured. Diffuse heads, which have either a 2.5" or 6" standoff, are used on targets which are not shiny and are rougher. Examples of these targets would be dull, painted surfaces, opaque plastics, and many rough machined or grainy metals.

A specular surface can be made into a diffuse surface by attaching a small "Kodak" white paper target to the area to be measured. MTI can make recommendation with regards to surface finishes. More.

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