The Research On Characteristics Of High Temperature Explosion Field Of Thermobaric Explosive With Infrared Testing Technology

The measurement of explosion temperature field imposes a great influence both on assessment and analysis of the thermal damage effect of thermobaric bomb. The explosion of thermobaric bomb generates a transient high temperature and high pressure field with a strong shock wave, which is extremely destructive. The traditional thermometry can no longer satisfy the measuring requirements. In view of this, this paper has focused on the research of infrared testing technology on the hyper-thermal explosion field of thermobaric explosive.Having been based the infrared thermometry theory, this paper introduces the infrared thermal imaging technology. To build the system, thermal infrared imager is chosen as the core thermometer. Considering the specificity of measuring objects, customized infrared machine cores have been selected, as well as specified interference filters and damping devices. Such a system is able to implement continuous measurements on transient hyper-thermal field without any disturbances.In consideration of thermal infrared imager’s measurement accuracy, the thermal infrared imager must be calibrated in real time, thus making the test data reliable, for which the radiometric calibration has been designed. Moreover, a geometric calibration experiment is set to measure the blasting fireball size.The complicated environment of outdoor test sites greatly influences the measurement accuracy of temperature-measuring system. This paper theoretically analyzes the factors that affect measuring accuracy, and then presents some relevant improvement approaches and designs replication experiments as well. This experiment adopts the double line of atomic emission spectroscopy to measure the two different ingredients of gunpowder combustion flame temperature. When comparing the test consults derived from this method with the temperature-measuring system above, the relative errors are 2.83% and 8.77% respectively, which further ensures the feasibility of this designed system scheme.This experiment focuses on measuring the hyper-thermal explosion field of thermobaric bomb, of which the blasting fireball size measurement consists of the surface temperature field distribution range based on infrared temperature-measuring system and diameter shot by a high-speed motion analyzer. Finally, the measuring results are as follows: a. The maximum temperature of blasting fireball is 2881℃. b. The duration time of the blasting fireball’s surface hyper-thermal explosion field(≥1000℃)is 1300 ms. c. The maximum range of hyper-thermal field is 12.61 m, and the diameter obtained in the visible range is 13.16 m. As a whole, this thermobaric bomb performs well and stably in the aspect of thermal efficiency. After comparing with the measurement by visible light, it further proves the reliability of the obtained data. The test conclusions indicate that the measuring data, to some extent, are accurate and reliable, and the testing system is feasible as well.