Sample e.g. bitumen, analyzing method for predicting e.g. viscosity, involves measuring spectrum of polychromatic incident radiation and reflected radiation subjected to total reflection in attenuated total reflectance crystal

摘要

The method involves measuring a spectrum of polychromatic incident radiation (4) and reflected radiation (5) subjected to total reflection in an attenuated total reflectance (ATR) crystal (3) e.g. IIa diamond, where refraction index of the diamond for infrared is in the order of 2.417-2.419. The reflection is attenuated by the absorption of the radiations in a sample (2) placed on a flat surface (7) of the crystal.