Spectroscopy is the study of the interaction of electromagnetic radiation in all its forms with matter. In Optical Emission Spectroscopy (OES) the sample to be tested for metal and trace elements is vaporized. Atoms and ions contained in the atomic vapor are excited into emission of radiation. The radiation is passed to the spectrometer optics where it is dispersed into its spectral components. From the range of wavelengths emitted by each element (or metal), measurements take place. The radiation intensity, which is proportional to the concentration of the element (or metal) is recalculated, based on calibration curves and is shown as percent concentration.<ref>https://www.spectro.com/products/optical-emission-spectroscopy/arc-spark-stationary-oes-working-principle</ref>
Oligoscan does not fulfill any of the principles that would apply to metal analysis.