Phys.org  October 8, 2018 An international team of researchers (UK, USA – industry) was able to identify 11 white powder samples using their infrared laser system. No samples or disturbance of the powders were required, and they could be identified from up to one metre away. They illuminated each sample with broadband coherent light in the 8–9-µm band. Similarities between different spectra were quantified using Pearson’s correlation coefficient, confirming that spectral features in the 8–9-µm wavelength region were sufficient to discriminate between all eleven powders evaluated in the study. The researchers believe that the identification system will prove most useful […]