Coupled to the Thermo Scientific™ Nicolet™ iS50 FTIR Spectrometer, the SOC-100 provides polarized, angular diffuse reflectance measurements from 8° to 80° incident angles, for the entire spectral region covered by the FTIR. The spectral region is nominally 2.0 to 25.0 μm using the standard FTIR optics, and can be extended to 200 μm using mid-/far-IR optics.
Traditional techniques for measuring the diffuse reflectance of materials use an integrating sphere to capture the diffusely scattered energy. Because of energy considerations inherent to integrating spheres, useful measurement data is limited to about 14 μm. The SOC-100 uses a 2π imaging hemiellipsoid to illuminate the sample using a 700°C blackbody. A movable overhead mirror captures the energy reflected at angle and directs a collimated beam into the FTIR. This measurement of the hemispherical directional reflectance (HDR) is identical, by the reciprocity theorem, to the directional hemispherical reflectance (DHR).
