Multi-spectral imaging techniques for temperature measurement in explosion fields

Aiming at the extensive temperature range of the explosion temperature field and the challenging testing environment, this paper presents a high-precision, wide-range multi-spectral radiometric temperature measurement method based on multi-spectral imaging. This method aims to accurately measure the high temperatures associated with the explosion field of 40 kg of aluminum-containing explosives. We uniformly coated a 25-band multi-spectral filter array (MFA) onto a CMOS sensor to construct a multi-spectral radiation camera (MRC). This camera can capture 25-band spectral images in a single snapshot. The MRC was calibrated using a high-temperature blackbody furnace, achieving a calibration range of 1973.15 K to 2973.15 K. Ultimately, we employed the generalized simulated annealing (GSA) constrained optimization algorithm to measure the explosion temperature field of the 40 kg aluminum-containing explosives. The maximum temperature of the explosion fireball was recorded at 2903.68 K, with a maximum relative temperature measurement error of 1.93%.