• A novel method for achieving calibrated and stable emissivity using a blackbody, a perforated screen, and a novel IR thermal sensor (TMOS) is presented.
• The methodology employs two-color measurements with optical filters to conform to the grey body definition, enabling accurate emissivity determination.
• The effective emissivity of a photochemically etched perforated screen is directly related to the hole density area, simplifying calibration.
• Ray tracing simulations and experimental results validate the approach, demonstrating its practical applicability in IR radiometry.