激光干涉气液两相流测量图像自动辨读方法的研究

在能源、化工、炼油、制药、机械制造等领域中广泛存在着气液颗粒两相流的测量问题，因此气液两相流测量技术一直是国内外的重点研究课题。该文将介绍一种气液两相流测量的新技术——激光干涉气液两相流测量技术(ILIDS)，它具有提取两相流参数全、测量精度高和测量区域较大等优点。该技术利用高干涉性片状激光束照射气液两相流，粒子将激光以折射和反射的方式散射，用高速数码相机(120万象素)收集并汇聚散射光成像，折射光与反射光之间因存在相位差会在汇聚成像系统的失焦平面上形成干涉条纹图，图中包含粒子的粒径和空间信息。利用作者开发的图像处理软件对两相流干涉图像进行数据处理，自动高速提取两相流信息，将处理结果与人工辨读比较，有效粒子信息提取率高于90％，粒子定位及粒径计算误差小于5％。实验证明本图像处理技术具有工业在线测量的潜力。

AN AUTOMATIC IMAGEPROCESSING METHOD FOR THE INTERFEROMETRIC LASER IMAGING DROPLET SIZING(ILIDS) TECHNIQUE

Two-phase flow exists in many industrial domains, so the measuring technology for two phase flow always be the emphasis of research. This paper describes a new technology for spray measuring named Interferometric Laser Imaging Droplet Sizing (ILIDS). This technology uses a laser sheet to illuminate the droplets and the light is scattered from the droplets by reflection and refraction. A high speed CCD camera is used to collect and to image the scattered light. A interferometric image of the spray will be obtained at a defocused plane of the CCD camera because there is a difference in phase between two lights reflected and refracted light. The interferometric image of the spray contains the information of the size and the position of droplets. The image is processed by the authors' software; the parameters of the droplets can be automatically and rapidly extracted. The parameters extracted by the software are compared with the parameters extracted by manual to estimate the error of the software. The comparison results show that more than 90% of droplets are detected by the software with errors in the size and positon are less than 5%. The experiment approve that the image processing technology developed by authors has a potential to establish an on-line industrial measuring.