Three-dimensional particle imaging with a single camera
Three-dimensional particle imaging with a single camera
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DOI：
10.1007/bf00193880
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发表时间：
1992-04
影响因子：
2.4
通讯作者：
C. Willert;M. Gharib
中科院分区：
文献类型：
--
作者：
C. Willert;M. Gharib
介绍了一种流场瞬时三维映射的新方法。单相机系统使用离焦与嵌入在相机镜头中的掩模（三个针孔）相结合来解码单幅图像上的三维点光源（即被照亮的粒子）。所述颗粒图像图案在图像平面上的大小和位置与所述单个颗粒的三维位置直接相关。使用连续图像，粒子可以在空间和时间上被跟踪，从而得到整个场的速度信息。系统标定简单，而粒子图像模式的自相似性可用于数据提取的自动化过程。利用该方法获得了涡流环撞击壁面流场中粒子的运动轨迹。
A new approach to the instantaneous three-dimensional mapping of flow fields is introduced. A single camera system uses defocusing in conjunction with a mask (three pin holes) embedded in the camera lens to decode three-dimensional point sources of light (i.e., illuminated particles) on a single image. The sizes and locations of the particle image patterns on the image plane relate directly to the three-dimensional positions of the individual particles. Using sequential images, particles may be tracked in space and time, yielding whole-field velocity information. Calibration of the system is straightforward, whereas the self-similarity of the particle image patterns can be used in automating the data-extraction process. The described technique was used to obtain particle trajectories in the flow field of a vortex ring impinging on a wall.