Infrared Transmission Measurements of Diffuse Samples

Measuring the transmission of diffuse samples such as paper or filled polymer films requires an integrating sphere to obtain accurate transmission values and useful chemical information, because the IR light is scattered as it passes through the sample. Using an integrating sphere, an infrared transmission spectrum of lens tissue representing a diffusely transmitting sample was collected and compared with a sample spectrum collected in the FT-IR sample compartment. PIKE’s IntegratIR, integrating sphere accessory was employed in this study.