Compensation method for infrared temperature measurement of explosive fireball

Abstract

The temperature of explosive fireball is an important index for measuring the performance of explosives. Considering the harsh environment in the explosion field, the acquisition of fireball temperature depends mainly on the radiation temperature measurement method. The content of research on radiation temperature measurement in the explosion field includes two main points, namely, (1) how to measure the fireball radiation energy accurately and (2) how to convert the measured radiation energy into fireball temperature accurately. Theoretical studies on infrared temperature measurement in the explosion field are scarce. No theory is suitable for modifying fireball temperatures measured by IR system.A temperature compensation formula is proposed based on geometrical optics and infrared radiation theory in this study to eliminate the measurement error of radiation energy caused by the test environment. The principle of the influence of distance and meteorological conditions on measurement accuracy is analyzed. After eliminating the temperature error, image gray level is introduced as an intermediate variable, and the temperature compensation relationship is derived based on error transfer theory. Subsequently, the correctness of the theory is verified through simulation experiments. The measured temperature of 3 Kg of HMX mixing powder is compensated for and corrected. Compared with the original data, the revised values are closer to the detonation temperature of 2000 °C.