Apparatus for determining the effective surface roughness of polished optical samples, by measuring the total integrated scattering, only operates for non-light-transmissive samples. For a transmissive sample, the invention adds a light trap behind the sample for transmitted light, and a diaphragm in front of the sample. The rear surface of the diaphragm is provided with a non-reflective wafing which traps secondary light reflected or scattered by the inside rear surface of the sample.
7,041,997 Device and method for optical control under diffuse illumination and observation means of crockery items or any glazed ceramic products
0
2001
* 2003/0184,740 Device and method for optical control of crockery items such as enamelled plates or and enamelled ceramic product
0
2002
* 2006/0180,775 Device and method for optical control under diffuse illumination and observation means of crockery items or any glazed ceramic products
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