Figure 11
Ring illuminator and detector (a) and its schematic diagram (b) used to acquire interactance measurements. The ring-type design of the illuminator enhances the intensities of incident light and interactance collected by the detector. The detector is movable between preset positions from number 1 to 15, and the distance between any two adjacent positions is constant (2 mm). The illustration in the schematic diagram (b) was made using Microsoft PowerPoint for Microsoft 365 (https://www.microsoft.com/ja-jp/microsoft-365/powerpoint).
