Dual-camera system for high-speed imaging in particle image velocimetry
Dual-camera system for high-speed imaging in particle image velocimetry
复制标题
粒子图像测速中高速成像的双摄像头系统
DOI：
10.1007/s12650-012-0127-0
复制
发表时间：
2012
影响因子：
1.7
通讯作者：
H. Mouri
中科院分区：
文献类型：
--
作者：
K. Hashimoto;A. Hori;T. Hara;S. Onogi; H. Mouri
粒子图像测速技术（PIV）是实验流体力学中获取速度矢量瞬时场的重要技术。在流体中植入跟踪流的示踪粒子，这些粒子由一片光照亮。使用高速摄像机，拍摄颗粒的两个连续图像。两个图像之间的颗粒位移决定了流动的速度矢量[详细信息，参见Raffel et al.（2007）; Adrian和Westerweel（2010）]。两个图像之间的时间间隔必须很短，特别是当流动很快时。必须准备一台高速照相机。然而，高速是以牺牲相机的其他性能为代价的。即使在撰写本文时，敏感性仍然存在。ISO 2000在彩色模式和传感器的分辨率保持不变。4,000 93000.这些性能明显低于高端相机。虽然高速相机正在改进，但这种落后于静态相机的现象并没有消失，因为它们也在改进。高速度也增加了相机的成本，这使得一些研究人员无法进行PIV。我们指出，这两个图像可以单独拍摄两个静态相机。即使是低成本的相机，它们也可以实现与标准高速相机相同的性能。更重要的是，有可能制造出比任何高速相机都具有更高灵敏度或更高分辨率的成像系统。这个想法很简单，可能不是新的，但我们没有发现这样的系统实际上是用于PIV的例子。本文是第一次演示的PIV与两个静态相机。成像系统在第2节中描述。PIV的一个例子在第3节中描述。这些评论的摘要见第4节。
Particle image velocimetry (PIV) is an important technique in experimental fluid mechanics to obtain instantaneous fields of the velocity vectors. The fluid is seeded with tracer particles that follow the flow, which are illuminated by a sheet of light. Using a high-speed camera, two successive images of the particles are taken. The displacements of the particles between the two images determine the velocity vectors of the flow [for details, see Raffel et al.(2007); Adrian and Westerweel (2010)]. The interval between times for the two images has to be short, especially when the flow is fast. It has been essential to prepare a high-speed camera. However, the high speed is achieved at the expense of other performances of the camera. Even at the time of writing this paper, the sensitivity remains. ISO 2000 in the color mode and the sensor resolution remains. 4,000 9 3,000. These performances are significantly lower than those of top-end still cameras. Although high-speed cameras are being improved, such a lag behind still cameras does not vanish because they are being improved as well. The high speed also raises the cost of the camera, which prevents some researchers from PIV.We point out that the two images could be taken individually with two still cameras. Even if the cameras are those at low cost, they could achieve the same performance as a standard high-speed camera. More importantly, there is a possibility to be able to make an imaging system that has a higher sensitivity or a higher resolution than any high-speed camera. The idea is simple and is probably not new, but we have found no example that such a system was actually made and used for PIV. This paper is the first demonstration of PIV with two still cameras. The imaging system is described in Sect. 2. An example of the PIV is described in Sect. 3. The remarks are summarized in Sect. 4.