基于高速成像的爆炸温度场测试方法

为实现对爆炸温度场的动态测量，针对爆炸温度场变化快、范围广、温度高、难以测量的问题，提出一种基于高速成像技术的爆炸温度场测温方法。基于辐射原理推导出高速成像系统的温度测量模型，建立高速相机图像灰度值和被爆炸温度之间的对应关系，得到可通过控制高速成像系统曝光时间和透光率2个参数控制测温范围的算法；搭建高速成像爆炸温度场测量系统，用最小二乘法对系统进行标定，标定结果显示：该建模方法在2 200~2 900 ℃区间平均误差为0.74%，在1 850~2 350 ℃区间平均误差为1.95%，能够满足爆炸温度场的测量需求。运用搭建的系统与红外测温仪分别进行375 g、750 g及1 500 g 3种药量的温压弹爆炸温度测量对比实验，实验结果表明：该系统与红外测温仪之间的温度测量值最大偏差为3.31%，实现了高响应速率及高分辨率测量。

A Temperature Measuring Method for Explosive Temperature Field Based on High-speed Imaging Technology

A temperature measuring method for explosive temperature field based on high-speed imaging technology is proposed for the fast change, wide range, high temperature and difficult measurement of explosive temperature field. Based on the principle of radiation, a temperature measuring model of high-speed imaging system is deduced. The corresponding relationship between gray value of high-speed camera image and temperature of explosion is established, the temperature measuring range can be controlled by controlling the exposure time and transmittance of the high-speed imaging system. A high-speed imaging explosive temperature field measuring system was build, and the least square method was used to calibrate the system. The calibrated results show that the average error of the proposed method is 0.74% in the temperature range of 2 200-2 900 ℃ and 1.95% in the temperature range of 1 850- 2 350 ℃, which can meet the measuring requirements of the explosive temperature field. The proposed system and the infrared thermometer were used to measure the temperatures of 375 g, 750 g and 1 500 g explosive charges in experiment. The experimental results show that the maximum deviation of temperature measurement between the system and the infrared thermometer is 3.31%, which realizes the high response rate and high resolution measurement.