基于彩色成像的铸件辐射温度场测量

研究了炽热铸件辐射成像和温度场测量的方法.通过比较铸件的计算机图形RGB三色辐射亮度,建立铸件表面的辐射亮度等高线;通过黑体定标系统建立亮度、RGB三色值和辐射温度之间的联系后,可测定铸件随时间、空间变化的温度场.利用图形色阶可以控制和调整等高线的生成区域大小、等高线密度和等高线生成初值,突出被测物体的主体.它可作为计算机仿真、凝固模拟的补充和铸造缺陷事后分析的辅助工具.CCD器件的普及为工程推广应用提供了物质基础.

Temperature Field Measurements by Casting Radiation with Color Imaging

It is researched that the measuring methods of radiation imaging and temperature fields of red-hot castings. It can be gotten the contour lines of radiation illumination on castings' surface through comparing its values of three colors red, green and blue in computed graphs. It can be measured that the temperature fields of castings in the changing space and time, after marking the measuring system in the relationship between CCD camera, the values of RGB, black body systems, illumination and radiation temperature. It can be controlled the size of the new producing zones and densities of the contour lines to deal with the original graphs in computer, through adjusting the color ranks for first figured contour. So it is sticking out the main, blazing objects and can get the isothermal line from the isohypse. It is an useful tool to resupply the computer solidification simulation and analysis of casting defect. It has potential usage in the foundry engineering, for example, monitor, data of radiation and temperature in the procedure. It can also help to check the solidification simulation results and to provide the initial condition or boundary.