Thermography of surface temperature of explosion fireball by visible and infrared band

Abstract

Surface temperature of explosive fireball is vital for the evaluation of the thermal damage ability. In order to improve the spatial and temporal resolution of the measurement, based on the thermal radiation law, the principle and limitation of the equipments used to measure the surface temperature of explosive fireball are analyzed, such as infrared thermography camera, photoelectric pyrometer etc. Based on CMOS image sensor and its built-in filter array, a temperature measurement method based on visible band is proposed to realize the imaging measurement of the surface temperature of explosive fireball. An experimental verification was carried out by using infrared thermography camera and a high-speed camera based pyrometer, the experimental results show that there are differences in the shape of fireball measured by different temperature measuring systems, the reason of the result is analyzed. The research has laid a foundation for the construction of infrared and visible band combined temperature measuring system.