While the previous standard methods of sorting glass using camera systems in the visible wavelength range are usually costly and only selective to a limited extent, Raman spectroscopy is an attractive alternative.
Raman spectroscopy used to be regarded as purely for laboratory use because it was time consuming. In cooperation with TOMRA Sorting Solutions, the CTR researchers have now developed a prototype for an inspection system for sorting glass based on real-time Raman imaging spectroscopy that is suitable for industrial use. It is a non-destructive analysis technique which provides detailed information on the chemical structure, crystallinity and molecular interaction of a sample. We set about further developing the technology in a number of steps until it proved suitable for applications in industry and an attractive alternative to the methods used to date.