Non contact thickness measurement

STIL chromatic confocal sensors are destinated to measure thicknesses without contact, by transparence or step height difference, in every environment such as in-line industries or in labs. 
The principle consists in measuring the position of a diopter, ie the interface between 2 surfaces with a different refractive index, and simultaneously the position of another diopter. The difference between the 2 distance measurements indicates the optical thickness measurement, from which the mechanical thickness is deduced.
Measuring samples comprising several layers is possible using the same method: The multilayer software measurements is available on some STIL MARPOSS controllers.