A Fast Optimized Dual-color Colorimetric Temperature Measurement Method for High-temperature Surfaces based on Controllable Error of Temperature Field*

CCD-based colorimetric temperature measurement enables non-contact monitoring of high-temperature fields but faces dynamic range limitations due to improper exposure during calibration. Traditional exposure adjustments compromise measurement accuracy while attempting to expand temperature detection ranges. This study proposes a novel calibration method utilizing an artificial blackbody to bypass emissivity-dependent corrections of measured objects. By acquiring multi-exposure thermal radiation data from the calibration blackbody, the system achieves simultaneous radiometric calibration and temperature field reconstruction. The improved process reduces temperature measurement errors from 4.5383°C to 2.1397°C, yielding a 52.85% improvement. Experimental validation confirms the method efficacy across 1000°C − 2000°C, significantly enhancing dynamic range, adaptability, and accuracy for color CCD cameras in high-temperature applications.