A novel design of an accessory for diffuse reflectance spectroscopy in the infrared region is presented which allows in situ analysis of small surface areas (&phis; 3 mm) on bulky samples. The optical design and performance with particular respect to the rejection of specularly reflected radiation are discussed, and results for different varnishes are shown.
E. H. Korte and A. Otto, "Infrared Diffuse Reflectance Accessory for Local Analysis on Bulky Samples," Appl. Spectrosc. 42, 38-43 (1988)