Infrared Emissivity and Reflectivity Measurement
topic
Infrared emissivity measurement uses a calibrated radiometer to compare thermal radiation emitted by a fabric surface to that of a blackbody reference at the same temperature, while spectrophotometric reflectance in the 8–14 micron waveband quantifies the proportion of body-emitted infrared radiation reflected back toward the wearer.
Role
Critical for evaluating far-infrared textiles claiming enhanced body warming, military camouflage fabrics designed to reduce thermal signature, and radiative cooling textiles engineered to emit body heat through the atmospheric window.