The Precision Radiometric Surface Temperature (PRST) sensor delivers a surface temperature mapping capability covering a temperature range 400-2000K with resolution of <20K, with spatial resolution of 0.5 cm at a distance of 10 m, and at real-time video rates (to 132 Hz). Operating wavelength range is 2-5 μm. The key feature of this sensor is that temperature accuracy is maintained without a priori knowledge of target spectral emissivity or even as the emissivity may be rapidly changing.